billhulbert

Ve4ma feed


6. Similar tricks can be done in rectangular waveguide too, but it is much easier to turn them on a lathe. Cold sky to sun-noise at a solar flux of approx. 5 KW 352 352 352 Preamp G4DDK DB6NT G4DDK #2 Relay CX-520D Relcom Relcom NF, sys. Practical solution has Franta OK1CA VE4MA Feed Horn 1296 MHz 23cm, 2. DB6NT preamp and scaled VE4MA style feed), Page 6 of 30 microwavers. 2L Sep 17, 2017 · Well, over the holiday weekend I finally built the prototype septum feed that I wanted to build. • You loose 3dB (half of your uplink power) with cheap WiFi-Antennas. 3. In a mesh dish the feed-horn “sees” the ground, 290K, through the mesh aperture and there is gain loss. What we often call a “feedhorn” includes several separate elements: an antenna which shapes the The feedhorn described below is a combination of W2IMU and VE4MA. 5 pounds of feed per pound of gain when a whole-grain feeding program is used. *Note: Dish gains per VK3UM Calc for 23cm W2IMU feed, 9cm VE4MA feed,  The feed was constructed according to an optimized template by VE4MA (an open waveguide with a collar choke). 5 dB • Combined with WA5YWC’s 35 inch prime focus dish with a VE4MA scalar feed resulted in 5 dB of sun noise. Access to a friend's lathe and vertical mill (Robert Carlson) helped a lot with this project. That was a result of the install method of the septum. The measured F/D ratio works out >to 0. 6 High efficiency circular polarised feed horn by W21MU. 6 Retweets; 79 Likes; Julio Daniel Cabral · Troy · Radio  12 Jun 2020 25-4-2020, VE4MA, 559, 559, 5. 3 meter solid dish with VE4MA feed + G4DDK LNA. jpg 49. 5 MHz into dipole array Following years, Moon used for Teletype Sep 07, 2015 · Possible, I was using a VE4MA feed horn though. dish, only 0. For more detail, please visit http a VE4MA feed, which would have provided optimum illumination of my 28ft 0. Whole-grain feeding improves feed efficiency, increases rate of gain, and lowers the feed cost per pound of lamb gain. VE4MA feed GaAlAs HEMT LNA Equalizing filter GALI-52 amplifier Band-pass filter Signal splitter 1. 12 dBi the -10 dB illumination angle is 75°. While I will have the capability for jt-65. 6dB cable), LNA NE42484 nf=0. The tin plate box contains the Pre Amplifier VE4MA 6Adding to an Arrow Satellite Antenna for Skip to main content. 2016 Barry Malowanchuk VE4MA Tribus: Sierra Six Three. • It has some limitations and interactions with the other parts of the feed. I replaced damaged PA by MKU-13200-A and was surprised, that even stations with 4 To be modified/installed DISH TX LINE LOSS: 0. Dual feed design • Ideally: use single dish for both RX and TX • Required: dual feed with enough isolation • Initial ideas presented by Peter DJ7GP in AMSAT-DL Journal • Johannes DC5GY has significantly improved the design • Gain 10 dB (13cm), 12. W. Kumar [ Reduce Cross-Polarization In Reflector-Type Antennas, Microwaves, March 1978] and has been used by VE4MA in his feed designs. 1 mm (depth of 9. 3dB less sun noise (W5LUA & K5GW, August  10. 5dB in “feed box” • This feed is aimed at the geo-stationary satellite Eshail using up-link in S-band and down-link in X-band • The S-band feed is realized by a Coaxial Cavity, fed in two orthogonal linear polarizations with a 90 degree phase shift in order to generate circular polarization by the use of e. 2304 MHz EME WD5AGO VE4MA/Septum Circular Feedhorn 3. Page 15. 11: 42 AM - 25 Apr 2020. g. 17. After getting bored with the blank video from the ISS(!) i decided to get the 23cm feed back on the dish and play EME. 42GHz SMA-F connector SMA-F connector. He determined that the illumination at the dish edges MHz Callsign # Antenna dBd WL [dB] SF Sun dB SF DELTA dB dB dB dB dB dB F/D Feed Coax length [m] Splitter Relay STAGE LNA transistor + type NF Gain STATUS 432 OK1TEH 1x 23el DK7ZB 7023 17,0 8,2 3,0 69 5,0 69 -2,0 opn dip CF 1/2" 3,0 no CZX3500 1 ATF54143 OK1VPZ 0,40 15 QRV • Parabole 3m pour Uplink 2. wiedehopf. feed. Some improved variations of the VE4MA and Chaparral feedhorns are described which show some of the highest calculated and measured efficiencies to date for a prime-focus dish. • Feed: Super VE4MA choke flange with Circular to rectangular transition (WR42) • W/G switch: “EVENTS HORIZON” • LNA @ feed Kuhne 1. VK3NX 2013. 1 0. Gain loss dB 6 x 6 mm 2 mm 4K <0. 22, feed=VE4MA-circular-horn, 150W TX-Power-Output (-1. 2 S-Band Performance Radiation patterns for Feed 1 and Feed 2 are displayed on Figs. I have seen lots of designs on the internet for a dual feed for TX/RX but they have all been for an offset dish. 368ghz super ve4ma feed. I replaced damaged PA by MKU-13200-A and was surprised, that even stations with 4 VE4MA type of choke ring: W5LUA and K5GW reported making comparison tests of an OK1DFC septum feed on Gerald’s 22. 5. Noise Figure: Al Ward, W5LUA, lead a team consisting of Barry Malowanchuk, VE4MA, Tom Whitted, WA8WZG, Tony Emanuele, WA8RJF, Ron Bergantzel, KAØRYT, Charlie Calhoun, K5TTT, and Joel Harrison, W5ZN. 7; WA2VOI Microwave Associates Gunnplexer horn 17. Tadeja Saje, Matjaz Vidmar. 2 to 0. 8 dB (3cm) • Isolation >60dB Since December 2013 Kuhne electronic is officially ISO 9001:2008 certified. illuminated by a VE4MA style feed. Dish Focus. 45) is suitable VE4MA super-feed-horn with a narrow rim. F5PAU. 25 Closer to Reflector. 04 pF Ua 2. 3> Install the horizontal UHF link antenna at the bottom of the new mast. jpg 54. He has a winter home in Apache Junction AZ,on the east side of Phoenix in DM43fk, and will be there until April 1. 4dB NF. Initial results show good resonance, but too high in frequency (1334 MHz) Winter 2010 – Build a PHEMT (ATF54143) LNA (preamp). 5 m 150 W. 0 Introduction and Feed Index - 23 September 1999 6. 7m Andrew dish f/d 0. 2015: With the completioin of 1296 on the 4. 2m dish, VE4MA-style feed, Coaxial lines, dish steering and control. 04 + Python2. 8 m dish. 40. The polarization . 2002 EME Conference Using Sun noise SM5LE's pages. 5 85. 375, therefore a patch would be appropriate. 0dB Gain = 11. 3f/D0. LNA MKU-342A from KUHNE electronic Rev 1. I wanted to avoid an extra plug/socket on the LDF1-50 coax feed from the 5. 35 to 0. It was first modified by hams for the 23-cm band in the early 1970's. When scalar ring is added, and the feed is compared with a VE4MA feed on a 22 ft. Includes Optical communications, with light, Forum rules Oct 24, 1997 · The use of a single scalar-mode choke on a cylindrical feedhorn has been explored extensively by Barry Malowanchuk, VE4MA. 4 GHz amateur DSN setup with a Grizzly G0752z. 7 m 40 W. Fig. The Results (April 2017 - May 2017) • What really matters for EME is what is the performance at the feed. 8, but I never saw anyone using this togehter with a dish. 5m dish. The trolley can be moved in and out for precise focus by remote control: The 5. Gain = ~35dB, NF = <0. VE4MA feed - 0. 3dB NF) finally a strip line input MGF1302, 13dB gain on first and 14dB the last one), both are enclosed near to the feed. This horn, which adds a single ring around a circular waveguide (Figure 2), has patterns shown in both papers which are not maximum at the center, but rather increase somewhat like our desired feed before tapering off like a typical feed – see Figure 1. Both of these feeds have separate RX and TX  26 Feb 2017 Overview One of the most prevalent EME sustain horns has been the "VE4MA" Feed. 7 RF spectrum analyzer E c h o s Somewhere along the line I was playing around in 4nec with a ve4ma feed rescaled from L Band to C Band. 4 to0. It was intended for use in a f(D Dish of 2. , VE4MA, "Selection of an Optimum Dish Feed," Proceedings of the 23rd Conference of the Central States VHF Society, ARRL, 1989, pp 35-43. They will guide you to a logic method in choice process. The system Greq N9CHA was using, he built up around a 18" offset dish that he modified the feed for and a DB6NT transverter at about 300mw. com submits his July/August EME report -- I did get on the Moon on 6 cm for the Apollo 11 Anniversary. VE4MA 23cm Feed. , dB 2. Transverter: DB6NT/Khune MKU 10 G3. A typical 6cm Tsys with a SOLID dish would be 85-95K Mesh aperture Wire thickness Added Temp. 28mm ID X-Band super VE4MA feed designed for 8425MHz centre frequency but usable on X-Band milsat, as used @uhf-satcom ground stations. 15 +/- 0. 3 to 0. Separate TX/RX lines. Procedure:Using a network analyzer, a commercial hybrid coupler and a test feed with H and V probes. reflected on tx and rx port is typical 25db. dish, It seems likely that the OK1DFC septum feed3,4 could also be enhanced by adding a choke ring, as shown in Figure 1, and optimizing the choke dimensions. I run a 30 watt TWT which produces about 25 watts at the feed. W5LUA. It seems likely that the OK1DFC septum feed3,4 could also be enhanced by adding a choke ring, as shown in Figure 1, and optimizing the choke dimensions. z. It abuts directly to the input / output connectors. Results on 144MHz: PROPAG. choke in septum feed described by the Paul Wade and Tommy Henderson [5] who proposed various choke dimensions according to the f/D ratio of the dish antenna. Mostly putting this here so I can find it again. 24 GHz DL7YC - RX tests: feed, LNA and TRX in the dish focus. VE4MA - W2IMU feed. Sheet metal and feed probe parts for our VE4MA feed antenna. Septum in the 3,8m dish: View 3,8m dish Diagram was done for 2,3 GHz feed. The foil is on the outside of the cardboard tube for the waveguide. It uses sim-ple copper waterpipe construction, with good workmanship — you could make your own, and after a dozen or so, you’d get a pretty one (and the ugly ones would work fine). It is nice to see a resurgence of EME activity on this band especially since we in the US are running the risk of losing the band to 5G interests. One of the two  OM6AA Round Septum Feed with Super VE4MA choke ring. If I would ever go 1296 eme again it would have to be a much sturdier mount and rotor design. Created Date: 20170307052841Z' standard VE4MA feed. It will be installed on the top side of the exisiting 1296 feed with a slight offset feed angle. Taken on October 16, 2014. Al’s feed is a scalar design optimized per the “W1GHZ On- FIg 1. 4/3. My Sun noise was 13 dB and Moon noise 1. Jim KØKFC was running a DEMI transverter at 2+watts and a 30"offset dish. However, the tolerance on dimensions for good performance is more limited than with the  ONLY for a few feeds and f/D No interaction between feed and reflector Feeds on CD. 14 Aug 2017 Quick vide of machining a Super VE4MA feed for 8. 7GHz horn to the masthead transverter/PA, so I used a plastic cable gland, but there was still too much movement. EG, if your free to air receiver looks like it tunes to frequencies like 10000 (10 gig) and you want to use it without an LNB or a non stock one then this is what you need. The feedhorn is connected to the output It became famous for success of an antenna system for TVRO (C band and Ku band) satellite reception. He is active on 144, 432, 1296 and 10G terrestrially. That's not abnormally deep. 3 GHz: K1JT: MAP65 Software for Microwave: N5AC: Contesting Survey Report: N3NGE: Dual Rotating Microwave System: 19 Speakers : contact W2PED to be added to this list May 08, 2020 · From the 2019 Microwave Update Conference in Texas, Barry, VE4MA, talks to us about WR-28 Waveguides on the 47GHz band. 45 range, with similar fine adjustment. pattern measurem ents of this feed and the fo llowi ng feed for a deep refl ector were p erfo rmed . Parabolic Dish Antenna with Typical Feed Horn Illumination. (The system uses a DSS offset feed dish, so it looks like it is looking down when it is not!) WØGHZ EN34 -- Aug 21, 2003. 65 dB respectively with the septum feed. 5dB of ground noise was observed with my converter of NF0. Uh 12. 5 dB preamp made by DB6NT followed by a DB6NT 24 GHz transverter. 9m dish was using a 60w amplifier in February 2014. I then decided to attempt to build a compromise system that would retain both bands. 1dB NF. 24 GHz DL7YC 2008. We had a hot dry day, with temps near 90deg and very light breeze once in a while. An appropriate feed for this would be a Kumar/VE4MA waveguide. 1296 Mhz: 3. 4, VE4MA feed, G4DDK preamp 0. The choke plate was made from FR4 PCB using a CNC drill at TELOK. The Quadrature Hybrid that is required with this nourish presents misfortune in front of the LNA which corrupts commotion temperature. 25-4- 1296Mhz VE4MA feed 2320Mhz VE4MA feed 7/8" coax from SSPA to 23 and 13cm feed. 4 pF Feed-through <= 0. OZ2OE design. • Moon noise = 0. Malowanchuk, VE4M; Page 35 and 36: Measured Sun Noise, 20-wavelength D; Page 37 and 38: VE4MA Feedhorns 0. The first EME QSOs that took place on 47 GHz utilized a program called MMCW which was a program written by a friend of RW3BP’s. That calculations for tuning a satellite receiver where the receiver has the LO frequencies already calculated in. 5dB Total gain is 38. Dish 6,75m , f/D 0,5 with W2IMU feed and LNA with FHX35LG 0,32 NF. A. 2 pF Output capacitance 3. 2. 1. 7m dish f/d 0. The main design goal was having a 13 cm feed with good circularity and return loss over the entire frequency range, 2304 - 2424 MHz. DL4MEA's super VE4MA Septum feed design: Page 1 Page 2 Page 3 Page 4 Page 5 6cm septum feed for fd 0. 25 dB, easy to track and or calibrate az/el by moon noise which is a plus. Complete antenna box with super VE4MA feeder. 5m Dish and First-Light with RX of Mars Express Posted on June 14, 2020 by David Prutchi Posted in Amateur DSN , Amateur Radio N2QG , David , Satellite hunting Yesterday I mounted the VE4MA with squeezed-tube depolarizer made by M0EYT ( uhf-satcom ) on the 3. JA1WQF Mitsuo was able to successfully decode W5LUA’s 47088. Page 17  Today I finised my Super VE4MA feed for 8 GHz. Feedhorn: Homebrew VE4MA style w/ Scalar Ring made from a 2" copper pipe cap. 925 +/- 0. ). Is it the W2IMU, the VE4MA, VE4MA Super or OK1DFC or perhaps the RA3AQ? There is   18 Jun 2010 When scalar ring is added, and the feed is compared with a VE4MA feed on a 22 ft. Nov 22, 2010 · This is a video describing my 3. Is there anything why it should be avoided to use such a high f/D? On 15-Mar-1999 W1GHZ wrote: VE4MA Feed Mounted on 3. 5 f/d) and the IMU feed for shallower f/d dishes [8,9]. OX2K worked 3 June 2000, O reports both ways. 6 Port 10 GHz tube 15x30 rond plein diam 50 SOURCE BI-BANDE 5. WD5AGO 2. 1 +/- 1. For 1. With a gain of approx. Provided audio, image, and video recording, editing, and presentation for events. £20GBP + shipping (usually a few GBP within UK) Eaton 7370 noise figure monitoring unit. • AMSAT recommends to keep your own signal in the same range as the CW beacon Feed: Homebrew Shepherd's Crook made from 3/4" copper pipe. The 3. It is an area of roundabout waveguide with orthogonal  Feed Throat to Scalar Ring Distance Calculation 4 messages in the process of tuning the position of the M0EYT-built X-band VE4MA feed on my 3. 26 system Cassegrain, feed is pyramidal horn with Septum polarizer, RHC RX: 1 preamp. Feedhorn: VE4MA circular Preamp: WD5AGO preamp at feedhorn. 35 pF Feed-through <= 0. the waveguide connection is wr75 and wr75 to wr90 adapters are 75 euro. mradams. Think it was a single relay as an added isolation now that I think about it. Talking about the size like the diagonal waveguide feed, W2IMU-Feed and VE4MA feed. TX line is a 16 meters of 7/8″ coaxial + 3 meter 1/2″ flexible jumper. A Low-Noise 'Urban' 30 element LFA Yagi for 432MHz. 20. Transverter under construction: Update - Jan. 25 dB, making it easy to track and or calibrate The 5. net wrote: >Hello Domenico & all >Thanks for all the information. In those days, the novice license was good for 1 year and non-renewable. I've seen dishes with rectangular feed apertures, for example the cheaper single polarization Andrew models. 6 V @ 1. Here is a nice white paper by W1GHZ that details the VE4MA style feed. The cavity amplifier unit design is based on a military UPX-4 pulsed L-band transponder transmitter. A feed assem bly emplo ying a Kum ar (VE4MA) choke is shown in Fig. Cheapest solution: soldered in a 9V battery holder to feed the LNA instead. 15 0. Following the success at 5 watts, tests were conducted at 3 watts and while a and ½λ deep chokes (Kumar, VE4MA), two- and threering chokes (Chaparral), and a dual- - mode horn (Potter horn, W2IMU). Quick update. Antennas used for 3,4 GHz • Wide range of diameters 32m to 2. 1296-MHZ EME STATUS QRT - Ysun/cs = 16. 1 pF Output capacitance 4. 3 VE4MA feed For example a linear polarized VE4MA design combines three parts: A drawing of the VE4MA feed FIg 1. 02 pF Designing a Super-VE4MA feed horn for 23cm and 13cm Günther Köllner, DL4MEA I/33 122 GHz Transverter with Separate TX and RX part Jürgen Dahms, DCØDA I/48 Analysis of some tropospheric openings on 47GHz and 24GHz Matthieu Cabellic, F4BUC I/62 So my question to the community: What is the minimum opening angle that a moderate sized feedhorn may achieve on 23cm. . 5m dish using a bracket designed and fabricated by KC2TDS. 1 Feed Phase and Phase Center 6. In a mesh dish the feed-horn “sees” the ground, 290K, W7 / VE4MA 5ft Offset (3/8 of a 10ft dish!) Waveguide run from 125W TWTA W2IMU Dual mode feed 1. Total gain is 38. W0RAP, WB0TEM, VE4MA, NU7Z, WA8WZG and AF1T. Larcan-Hi-Band-Amplifier-Conversion-to-222-MHz. However, the K5SO septum feed F2FU feeds for 13 cm. Hyperlinks on callsigns are to audio clips of signals (will add more clips later) 2. • It was first described by Dr. There is a version of a W2IMU feed shown best for f/D=0. See this document for an example. 5dB, own echos 6-8dB, +RX-Converter 2320 + 2424 MHz Moonnoise=0. 50dB G/T=22. I kept the removable bottom end cap, but added more screws to fasten it. I got these from K5UGM who got them from W5GG. 221 Like the Chaparral feed, it is best for deep dishes, with f/D in the 0. They have a reasonable amount of bandwidth but you need good soldering skills to build them. 25 0. W„ VE4MA, "VE4MA 3456-MHz circular polarization feed horn," Feedpoint, November/December 1991, North Texas Microwave Society. 5m pour Downlink 10 GHz • Parabole 20m en secours seulement • Monitoring des transpondeurs NB et WB • Génére les balises CW et PSK (télémétrie) en début et fin de bande • LEILA-2 Analyse des signaux - Sirène pour émissions trop puissantes ! dish, round Septum polarizer feed with a 3 section Chapperal ring, 0. Gain access to the VK3UM EME Performance Calculator. See Fig. Sometimes you see a question about what feed design is the best one. 2 meter Mesh Dish including 23 & 13cm LPD feed RF HAMDESIGN design and manufacture a wide range of RF DISH Feeds. Both of these feeds have separate RX and TX ports and do not require any switching to reverse the circular sense. 5Dish Efficiency (%)75700. 375 so this combination should do. 5” dia New super ve4ma feedhorn for multiband contesting. 5m dish, f/d=0. All of these have excellent phase performance over a wide illumination angle, so the efficiency curves for these feeds are good for any f/ D greater than 0. 35 lambda ring800. Feed Design Requirements for an efficient feed design for circular polarization ensue from the factors in equation (2), above: 1. 4, and works FB for uplink, another same dish i also have here with a ve4ma waveguide feed for rx,but this feed has choke ring to meet Mesh Feed-through, Tft • Mesh feed-through is calculated from the book by Otoshi, “Noise temperature theory and applications for deep space communications antenna systems”. Good circularity with no adjustments (versus labor intensive polarizer screws) 4. I wanted to use a circular horn feed of the VE4MA type since this was eminently suitable for the dish's 0. 35dB. 4 +/- 1. New feed at 1998 with septum polarize transformer. 3 f/d Solid Aluminum Dish 32 dBd ( pictured ) ( 1296 feed installed in picture, both feeds are interchangable within 15 minutes ) Original Prodelin 3 meter dish After working W5LUA and LX1DB using a linear polarised VE4MA type feed experiments were conducted with a septum feed to provide circular polarisation. 1 +/- 0. 1kw sspa - dc. 7GHz and 10GHz EME and finally got reasonable echo on both bands. Gain; min. The DB6NT LNA shown in the picture has a waveguide input and is coupled off of the relevant port in order to achieve reception of RHCP signals from the Orbiter. For the cylinder cavity, I used a Tx-Rx Systems VHF duplexer cavity. At the top is the curve for a 28 foot dish; since the reflector diameter is 20 times as large as the feed diameter, feed blockage is small and efficiency is high. The dimensions of the feed depend on the   Feed 4 Function feed4function. The Sun noise is a 3-dB improvement over what Al was obtaining prior to optimizing the dish surface. This permits the feed to be easily  for circular polarization nearly as high as the Super-VE4MA feed. 45λ deep. uniform cone) depend on the dimension of the feed. 3; WA2VOI Microwave Associates Gunnplexer horn - ref gain ant 17. 5 MW Go to 3400-MHz EME Station for more details. 3dB NF and SSPA with 8 times XRF286S watercooled. 0,47 F/D. 125 A Input capacitance 11. For deeper dishes the quad element feed shown with the portable 20-foot dish or a ring dipole work well. 1 mm and the aperture is 6. These were one way tests with only me transmitting. Ron and Barry went on to work many others the following two months including several Europeans DEM Transverter, Qualcomm amplifier at about 660 milliwatts. 71 eff0. com/PT4KFxlQ2c. B. High isolation between RHCP and LHCP Dennis NTØV and VE4MA were also active for the entire day (Saturday) since this was to be a single day rove for me. Smith chart; shows correct steps for future improvement: less backshort and shorter probe length Yu7ef 23cm - bs. 4 2 G H z c o a x l = 1 5 m USB EGIS EPS-103 control unit RS-232 9600bps 1. The entire feed is about 2' long. Aug 14, 2017 · Quick vide of machining a Super VE4MA feed for 8. 5λ was positioned 0. In order to find out the most favorable dish feed for Your EME-system follow the below bullets. the radiation pattern of the feed. 1 A Input capacitance 8. 45 to 0. 42GHz EGIS EPR-203 AZ/EL rotor ≈ B≈25MHz +19dB -6dB +28dB ≈ B≈25MHz +19dB GALI-52 amplifier HP6735s Notebook Ubuntu16. Before fitting the choke ring sun noise was down to 10dB compared to the 13dB from the VE4MA linear feed. 24 GHz DL7YC - 1. From: Robert Davies . typical 30 but often more. The pattern and efficiency plots for open circular waveguide feeds are shown in. 4m • Mostly commercial types • High gain SSPAs allow dish size, the f/D, and the type of feed, the results vary from minimal to very significantly affecting either the port match or port to port isolation of dual polarization feeds. 5 dB at feed •VE4MA feed point of 35 inch prime focus dish •Sun noise = 5 dB •Moon noise = 0. The VE4MA feed: A = transition, B = waveguide, C =  FEED 10Ghz VE4MA. Home. The first decision was the easy decision, what feed to use on 23cms? The W2IMU horn was the obvious Sep 20, 2015 · That is encouraging to hear, I just ran 1 5/8 and 1/2 in (same length!) out to my dish and will have roughly the same power at the feed. Most stations use their dish antennas on multiple bands making multi-band operation with a single dish quite a challenge. ATF36077 NF=0,5 dB (WB5LUA design) + 2 preamp ATF 36077 + converter Down East Microwave (LO 2160 MHz) + AR3000A IF 113 and 114 MHz Ingolf SM6FHZ described a suite of Kumar (VE4MA) feeds with 5 step septum polarisers, carefully optimised for f/D ratios 0. Comment. 32 to 0. feed consists of a septum part and a radiation part. The latest 70cm, 23cm, 13cm, 9cm & 6cm EME activity from G4CCH 4th November 2017. Rig under dish. I spent two years to finish the dish and it's pedestal operatonal on 5. 3 dB of Moon noise. jpg 57. We talk about plans to the upcoming event this weekend, and welcome Josh, KI6NAZ, from the Ham Radio Crash Course to come on and show his new antenna setup that he will be using on Field Day. Septum feed with the circular choke ring at the aperture of the feed was described in VE4MA feed [6]. This is its only task - in a well designed feed it has no effect on the directional pattern. (b) Analogy with a dipole array for beamforming with  and ½λ deep chokes (Kumar, VE4MA), two- and three-ring chokes (Chaparral), and a dual- mode horn (Potter horn, W2IMU). I have have a 1. 25 ~ . 1 May 29, 2015 · Currently on of the better designs appears VE4MA Super, the recent publication of DUBUS Vol 44 2/4 (the German radio Society's VHF technical publication) has an excellent article by Paul Wade W1GHZ (he also has an excellent website like VK3UM) on gain/temp noise of the various commonly used feed horns. 3. the dish to the 20W PA (Photo 3) mounted. 5dB loss) • Feed: Super VE4MA choke flange with Circular to rectangular transition (WR42) • W/G switch: “EVENTS HORIZON” • LNA @ feed Kuhne 1. At the moment Mitsuo is only running 1 watt but is actively working on a 10 watt amplifier. We constucted 3 samples for testing in an anechoic chamber in Prague. 3 0. 71λ Horn Diamete; Page 39 and 40: VE4MA feed, 0. 2' dish w/VE4MA feed 28. Made from Tx­Rx Systems 2m Duplexer cavity. For use in the new multiband contesting system a new linearly polarized super ve4ma feed for 13 cm was built. 0 dBi* Feed to be installed EIRP = 1. I have also started to put together the VE4MA feed. A further improvement to the cylindrical horn, described by Kumar8, is to replace the choke flange with a cavity choke ring around the horn,  VE4MA. 0 dB with W2IMU feed-horn - Jan. The only thing missing is a feed horn. I strongly urge you to think about using a septum feed on 1296. Radiation angel 130° for –10 dB. 2-0. Both these feeds provide circular Coffee-can feed. All stations used dish antennas ranging from 3 meters in size to 8 meters. 3 dB NF LNA. The feed was constructed according to an optimized template by VE4MA (an open waveguide with a collar choke). 4m. The dish f/D is 0. org Scatterpoint 1501. Not a feed that is large as a trash can (e. Yu7ef 23cm Yu7ef 23cm Military HF modems; Antenna Matrix Switch; 3cm, 9cm, 13cm, 23cm (VE4MA, Chaparral) feed horns fd=0. The first attempt was using the very popular W21MU feed, but all efforts to correctly, and fully illuminate the 0. In practice it is quite simple 1296 Mhz: 3. Various rules-of-thumb have been offered for maximizing receive performance by trading off antenna gain for reduced spillover, such as that by Barry Malowanchuk, VE4MA [15]. What has to be done: 1> Remove the short mast and replace with the new 20' section (VE4UI will be on the tower) 2> Attach the new feed line and raise the mast to at least the twelve foot mark. pic. 15 and 16. and ½λ deep chokes (Kumar, VE4MA), two- and threering chokes (Chaparral), and a dual- - mode horn (Potter horn, W2IMU). 5 dB with the linear pol feed, and 10 dB/0. 3 dB NF G4DDK LNA, TH347 with about 500 W at the feed and FT847 with Winrad waterfall +/ - 6 kHz. 0. • Easier to construct than sheet metal square septum feed or VE4MA feed • Easy to tune by adjusting both probes for best VSWR • Good circularity with no adjustments (versus labor intensive polarizer screws) • When scalar ring is added, and the feed is compared with a VE4MA feed on a 22 ft. AMATEUR RADIO STATION W4OP I was first licensed in 1963 at the age of 13 as WV2YPY. 0 Meter Andrew Prime Focus & 2. 5. hdl_ant software by W1GHZ is a good choice to calculate a dual mode feed horn. F6KHM. ve4ma feed and two 27mm to 22mm to use the radiation part for linear mode. 71 Kb Today we tuned the VE4MA feed. 1 • Parabole 3m pour Uplink 2. A larger feed results in a narrower pattern. 050" cut with 3/8" carbide. Figure 11-7 shows efficiency curves for the VE4MA feed on a range of dish sizes. Today's feed are either based on a paper by Kumar (and adapted to amateur use by VE4MA) or a septum feed. He has a 24 element loop yagi on 1296 15ft above the ground fed with 160 W. Enhancing the OK1DFC Septum Feed: VE4MA: 3456 EME: W5LUA: 1296 / 2304 Low Noise Amplifier Design: N2CEI: 2. The feed was excited by two identical signals with 0 to 90 degrees phase difference in 15 degrees steps. Figure 4; efficiency is lower than the VE4MA feed for all but the largest diameters,   Today we tuned the VE4MA feed. It is an area of roundabout waveguide with orthogonal persuade tests. 8dB, the calculated noise temperature of this feed horn is around 30K. I am not building satellite feeds, was just playing around a long time ago trying to study up a little bit sm6fhz/ve4ma linear polarization feed for 3 cm. A dish antenna requires a feed system designed for the specific frequency of operation. 65λ wide and 0. Hi! I'm in the process of tuning the position of the M0EYT-built X-band VE4MA feed on my 3. I cut off the welded top end cap; that yielded a nice 6. 2013 2016. The measured performance of return loss (RL) and isolation shows excellent agreement Druhého kola jsem se zúčastnil opět v omezeném čase , stejně jako v kole prvním . Scroll to the bottom for some recordings/jpgs of sigs. First we checked the test feed, which is a short style VE4MA feed, with no scalar. ) Its feature is that there is a coaxial chalk ring of 3 to 5 steps around the open end of circular waveguide. WW2R G3LTF circular septum feed Scaled VE4MA 1296MHz feed  DK3SE, CW, 23cm, 2. DISTANCE(km) DX STATION: VK3UM downloads. • Measured performance at feed was 22 watts power and a noise figure of 1. G4DZU's 3m Dish, with VE4MA Scalar Feed and 500 W on 1296 MHz. 5 m ANDREW Dish. 50 1. Complete Dish Antennas excellent feed for 70 cm operation with f/d dishes around 0. 4 f/D. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead o. 6 +/- 0. . The LNA The low noise preamplifier is a double stage with a NE32584 PHEMT at first stage. 34, VE4MA feed, G4DDK preamp <0. it Yu7ef 23cm 12ft Dish, VE4MA feed and 1 x 7289 N6CA PA : VE6NA: CW: 23cm : VE6TA: CW: 23cm: VE6TA with his new dish : Also on 6cm CW with just 10W at the feed, and later with Uh 12. 73 Ed At 11:28 PM 8/8/2008, w7lrd@comcast. 5 kV ( peak 5 kV !!! My rig is a 4 m solid dish with 700 W at the feed and a 0. Method for choosing a feed. Most ama- Feed-Horn (W2IMU / W6KBL / RA3AQ f. We tried again on 14 Aug and Andrea copied me well (O), but I only saw traces with Spectran. Done. They compared the septum to a VE4MA feed to determine how the septum would stack up. No longer have those pictures after a house fire. NEW FEED WITH SUPER VE4MA CHOKE FLANGE FITTED JAN 2015 Sun Noise = 14. Very good circularity over the entire feed subtended angle with low crosspolarization losses 3. 25 dB, making it easy to track and or calibrate Old info below, I am QRT on 23cm EME at least for now. This is focussed on optimum amplitude and flat phase across the aperture and low cross polarisation. 1 metre mesh dish antenna used by S56ZSA and S53MV to observe pulsars at 1420 MHz. OE5JFL's noise alignment horn) The problem is where you place the feed. VE4MA feed for 1. OK1KIR EME Team - 2. 5 dB of Sun noise and 1. KU band offset dishes about 18” diameter or a bit larger work decently with a 10 GHz feed. 4-inch diameter, 24-inch long cylinder. 7GHz transverter, power supply and septum feed are mounted near the focus on a trolley. 12Malowanchuk, B. The VE4MA feed: A = transition, B = waveguide, C = radiator First comes the coax to waveguide transition "A", which must bring the EM wave from the coax cable into the waveguide in a well matched way. (300w SSPA under construction) LNA: G4DDK Dual Stage VLNA kit. Looking into the business end. Page 31 and 32: Feed choices for 10λ diameter Dish; Page 33 and 34: References1. 2018 QARS Es’hailSat MELCO Japan Launch with SpaceX H E Abdullah bin Hamad Al Attiyah, Chairman of the Qatar Amateur Radio Society (QARS), • Uplink polarisation is RHCP (right-hand circular polarization, the Feed must be LHCP!) • Downlink polarisation for the NB transponder is V (vertical linear polarisation). 5 dB (estimated 10-foot of LDF4-50 1/2inch Heliax) To be installed ANTENNA: 4. 7 ET 10 GHZ 1K20FO - IKIGEX - 1K610Q cotes en mm 33 tube * les 2 vis doivent impérativement Lunchtime with Ham Radio 2. 15λ back from the waveguide’s open end. 22dB Gain/ 1. isolated 25db or higher. 30K - 40K is lower than general coffee can, and is a good level. It can deliver up to 250 watts. 7 times larger than the reflector feed can be made with sma/sma or sma/waveguide or waveguide/waveguide. OK1DFC - RA3AQ re design. The VE4MA feed, built by one of the Dallas gurus, W5AFY I think, and procured from K5GW along with the dish. 075 +/- 0. Conditions were never as good as the first Qs before 8am local and we worked mostly CW all day. 4 is 450 euro reflected 25db, isolation 35db feed is turned by hand on the lathe! picture for size comparison to a 10ghz septum with super ve4ma feed. A short MATLAB code was written to generate the required Excellon file containing the 1000 + holes! So my question to the community: What is the minimum opening angle that a moderate sized feedhorn may achieve on 23cm. CW and JT65, and occasionally SSB 239 initials and 55 DXCC VE4MA/K7 1 Light QSOs W2SJ 2 WB2RVX 2 K3JJZ 1 KB1JEY 1 KC2TN 1 N3RG 1 W3GAD 1 WA3DRC 1 Light Mults K3JJZ 1 KB1JEY 1 KC2TN 1 N3RG 1 W2SJ 1 W3GAD 1 WA3DRC 1 WB2RVX 1 Single Operator Low Power 50 MHz QSOs W1TR 154 N8RA 150 WA3NUF 132 KR1ST 128 NF3R 128 The feed is a VE4MA linear polarized for the 21cm, with a choke ring to reduce the illumination of the dish at its border and to get a better G/T factor. It is currently set up for 1296MHz EME (Moonbounce). 35 - 0. 5 m 40 W. 1296 MHz VE4MA Septum Feed with scalar with WD5AGO feed mount <0. Better Feed • More gain • Smaller sidelobes • Same beamwidth 15 Dish, Super-VE4MA feed. Measurement condition-unreflecting chamber of Electro-technician University Praha. THE FEED TAKING SHAPE Fall 2009 (cont. 375. Text in image: Gallery: VE4MA also went on to work AD6FP. £20GBP +  them, VE4MA, has written two good articles1,2 on TVRO dishes and feedhorns for EME. in Project Diana. G3LTF: Peter g3ltf@btinternet. The cake tin was a brilliant idea of my 11yo daughter who looked over my shoulder at a picture on the internet of a complete VE4MA feed in COPPER (aaarrggghhh, how much would that cost!) For actual EME Rx I plan to use my Icom 910H with VK3HZs excellent XRef installed with an external OCXO (which is pretty stable). 6 db NF preamp. So I made a "soup can feed" and arranged a simple clamp of copper strip to fix it to the waveguide flange. VE4MA Feed The VE4MA feed1 is based on a paper by Kumar6. Because the radiation aperture is large, VE4MA/Barry comments that this feed horn fits to deep parabolic reflector of f/d=0. Yaesu FT847 + XRef - 10 MHz-Locked Reference Oscillator + DB6NT transverter 10MHz GPS locked + microHam CW micro Keyer II The feed used on the 1m dish is a dual circular polarisation waveguide with a septum plate in it. 4> Get the new feed line into the building and terminate on the radios. 5” copper tube •Activity on 3400 and 3456MHz: Too much separation for one IF •Use DB6NT Tropo xverter on one band •Build receive converter for Crossband •DEMI preamp 0. ( Worked with only 15 W at feed ) 10-16-2011: 0528: 1296: 052600 4 -18 2. 2m dish, patch feed and 200W. Jim's system included a A32 board and a Wenzel reference, so we had a much better idea of our monitoring frequencies. The use of a Septum polariser also makes it far simpler to tune. 42 for 23, 6 and 3cm. OH2AXH testy  24 GHz DF1OI - TRX with 40 W out in dish with cassegrain feed · 24 GHz DF1OI - 2011 Complete antenna box with super VE4MA feeder. Feedline: 35' of 7/8" LDF-5 Hardline on TX, FSJ4-50 Superflex on RX. 9M DISH with WD5AGO-built VE4MA CP feed, Gain= 42. 7 GHz, CW. Antenna getting ready for installation: Page 16. • W2IMU dual-mode – several sizes. 71λ horn diameter wi; Page 41 and 42: Chaparral-style Feedhorns 0. I changed the feed to a septum, which was made several years ago with a foot of semi-rigid cables in T and R lines. 3,000 watts at 111. jde-italiancore. 43 f/D dish using this feed was a complete failure. 7GHz Transverter this time with VE4MA linear feed. 7m Prime Focus dish with an f/D of 0. 42GHz Observation bandwidth : 25 MHz without de-dispersion Preamplifier - The two-stage HEMT LNA homebrew - 0. I am also preparing 9 cm EME and expect to be QRV in the The excitation probe of feed 1 is shorter, causing its minimum to be slightly above the working frequency. The VE4MA feed, built by one of the Dallas gurus, W5AFY I think,. 6dB/16dB •Mount 40W Toshiba Amp at feedpoint For elliptic dishes we asked for help Rasto, OM6AA for software simulations and he found simple solution: Take tin Feed (for 23cm is fine usable bigger tin from Znojmo's town cucumbers :-) and gently step on the aperture of feed so as to become elliptic on the same sides as are the antenna axis of the dish and place such a feed to the antenna A Multiband Dish Feed for Satellite Communications--Harold Reasoner, K5SXK Dual Band Dish Feeds--Kent Britain, WA5VJB Low Noise Preamplifier for 23 cm and 24 cm ATV--Michel Rousselet, FD1FLN Some Experiments with Multiplier Chains--Michael Helm, WC5Z A Dual Probe Coffee Can Feed--Sam Popkin, K2DNR If you're serious about vinyl the new Accession is the phono The Accession stereo phono stage preamplifier uses patented technology which reveals much moreIncluded 3,8m dish, VE4MA feed, FHX35LGA preamplifier and PA with 2x2C39BA - 150W out, later TH338 1kW out. 2 0. 65dB CS / Gnd = 4. 05 0. After working Barry VE4MA earlier in the day a weather system moved through the area that looked promising. I worked on 26 July, on 23 cm For elliptic dishes we asked for help Rasto, OM6AA for software simulations and he found simple solution: Take tin Feed (for 23cm is fine usable bigger tin from Znojmo's town cucumbers :-) and gently step on the aperture of feed so as to become elliptic on the same sides as are the antenna axis of the dish and place such a feed to the antenna The cake tin was a brilliant idea of my 11yo daughter who looked over my shoulder at a picture on the internet of a complete VE4MA feed in COPPER (aaarrggghhh, how much would that cost!) For actual EME Rx I plan to use my Icom 910H with VK3HZs excellent XRef installed with an external OCXO (which is pretty stable). On 1296 MHz, the VE4MA Scalar feed is a good choice for deeper dishes (<0. Feed diameter: (a) in the efficiencies plot, the overall efficiency also takes into account the shadowing by the feed. 71 f/D650. I used a couple tractor hitch parts to make my mount. 5m pour Downlink 10 GHz • Parabole 20m en secours seulement • Monitoring des transpondeurs NB et WB • LEILA-2 Génére les balises CW et PSK (télémétrie) en début et fin de bande • LEILA-2 Analyse des signaux - Sirène pour émissions trop puissantes ! Apr 21, 2019 · Try to move the feed towards the dish,or away from it and look on the websdr for your uplink sig, for rx side use sdr stick+ program to see the difference. The new big-screen GPS displays have detailed maps and c an also feed an APRS radio and Falcon 9 2012. 4/5. As soon as Weather permits, I will change to 13 cm in order to listen for the moon probe and also to test my 2424 mixer. Most of the dish users have f/D around 0. 5 dB FIg 1. 5dB in “feed box” 12ft Dish, VE4MA feed and 1 x 7289 N6CA PA : VE6NA: CW: 23cm : VE6TA: CW: 23cm: VE6TA with his new dish : Also on 6cm CW with just 10W at the feed, and later with Figure 3. 5; WA5VJB W1GHZ Dual 10/24 GHz feed w/1. • What really matters for EME is what is the performance at the feed. 7 Meter Offset Feed Dishes at VE4MA noise because the moon illuminates the whole antenna beamwidth, and thus this thermal moon noise actually limits the ultimate sensitivity of the receiving system. 6 & 2 meter LDMOS 1KW Linear Amplifiers (click on any photo for a larger view) My interest in 2 meter EME made it obvious to me that I needed a bit more power than the usual 100 watts available from most radios on the market. Good impedance match 4. EME With the 23cm VE4MA feed fitted and some Rx tests done i found the system to be working better than it had done in the past, i have no idea why this is but i'm happy anyway maybe my measurement technique has changed Uh 12. DF4PV, CW · SSB, 23cm VE4SA, CW, 23cm, 12ft Dish, VE4MA feed and 1 x 7289 N6CA PA. 19 1. 23cm VE4MA feed, hybrid, relay and preamp. First we checked the  Download scientific diagram | (a) Mechanical dimensions of the VE4MA feed optimised for the L-band. The reflector f/D is 0. The next curve, for an 8 foot dish, 5. 43. I have a patch for the uplink in a 60cm dish with f/D 0. Hydrogen-line and pulsar observations with a small antenna. 100 inch wall!). Rasto, OM6AA and his team where concentrating on a feedhorn for 13 cm. This clamp bolts to the inside of the steel masthead box and holds the coax rigidly so I can plug directly into the coax relay without any danger of movement Dubus Technik Ill Deep dish feed horns revisited VE4MA, RSGB Microwawe Handbook Volume 3 14. July 1999 WW2R - VE4MA feed. W2IMU dual mode feed horn. LNA: Downeast Microwave W5LUA design 3-2 ULNA kit. Maintained a podcast and an rss feed for produced media. 43 f/d Kennedy dish, I could not entertain the permanent loss of 70cm. 375” Horn 9. 5m dish. 4GHz , Feed VE4MA Septum • Parabole 2. The dimensions of the feed depend on the ratio between the focal length and the diameter of the dish (f/D) and, of course, on the wavelength of the radiation that we want to receive: in our case λ = 21. 71λ Ho; Page 43: VE4MA Feedhorns The only feeds which have published phase data are the Kumar (VE4MA), Chaparral, Chaparral with slots, and the Koch Multi-ring feed discussed, all described in Chapter 6. 25 dB. We use a Narda hybrid coupler to make our test feed circular. 106 cm. One of the two 7289 driver stages. 80dB nf, 1W out, 25W-TWT. Measuring Sun noise repeatedly between positionings is not easy because the antenna needs to be lowe • Feed: Super VE4MA choke flange with Circular to rectangular transition (WR42) • W/G switch: “EVENTS HORIZON” • LNA @ feed Kuhne 1. In these types of the feed choke ring is added around the circular waveguide. Ground/cold-sky tests of the feedhorn showed 5. 33. Available on Dish 3,7m with the VE4MA feed and LNA . 20 Kb Receive port Return Loss @ Resonance : txportRL. Return loss of the transmit port was measured better than 28 dB with the feedhorn in the antenna. Yaesu FT847 + XRef - 10  Feeds for Parabolic Dish Antennas - in progress. We made some Sun noise measurements with good results compared to the expected values from the VK3UM software. About 50 initial contacts were made with 300 watts in the shack. I've upgraded my test kit and this is now surplus. * vis laiton diam 4 * vis inox diam 4 14. I am not building satellite feeds, was just playing around a long time ago trying to study up a little bit Feedhorn: VE4MA circular feedhorn. 1 MHz QRA-64D signal today Feb 10, 2020. 77 f/D0. Transition: Homebrew SMA to circular waveguide made from 3/4" copper pipe per W1GHZ article. I had to return home Saturday night. EME-standings: last update 14th. Feed + feedholder ready. 3 and use the smaller f/D version of W2IMU or even the VE4MA feed when the dish becomes deeper. For offset dishes you could use a W2IMU feed; but remember that they only have a very narrow bandwidth! I strongly urge you to think about using a septum feed on 1296. 0dB 10368 MHz: 3. It does have a bit of an egg shape at the probes end. Amplifier: Homebrew 75W (~65w @ feed) SSPA - 1x XRF286 on W6PQL pcb. Determine your objective as described above. It is a circular wave guide with a diameter of 3. 35; 3cm, 9cm, 13cm, 23cm RF power amplifiers (TWT, GAasFet) • Uplink polarisation is RHCP (right-hand circular polarization, the Feed must be LHCP!) • Downlink polarisation for the NB transponder is V (vertical linear polarisation). He has worked Charles Olive N6EQ on aircraft scatter (complete in less than 2 minutes on sked! An icon used to represent a menu that can be toggled by interacting with this icon. ) – Start to work on VE4MA feed. 7, assuring high aperture efficiency. 5dB Gain, 0. Offset-dish / VE4MA Super-Feed / Prime-focus) As you can read in the W1GHZ's Antenna Handbook, a specially dimensioned feed horn is required for a certain F/D. 375 Dish was mounted on thirty foot tower. Nobody makes the ve4ma feed so I will have to build my own (they say the ve4ma is the best design out there. 5 (0. With the dish at its lowest declination setting and the Moon just clearing the trees, I CW QSO with SM6FHZ. 2 faves. 3 VE4MA feed. 15 - Feed 1, calculated and measured radiation pattern on S-band, circular polarization. I started with 500W SSPA in the shack, but for an unexplained reason 2 of 4 transistors were burned after first 2 QSOs. WA6PY (ex SM0PYP) has helped me a lot when I built my first feedhorn in 1993. 9 Metre dish f/D 0. P275 This is also in a spread sheet on the W1HDQ website • The small gain loss is applied to the dish gain G. 35 F/D . VE4MA feed. We had previously published a methodology of accurately simulating the 23cm band round septum feed [1,2] and very careful measurements confirmed the simulations. 0 comments. The designs online line for the offset dish's have said they could work with a prime focus dish with and f/D no lower then 0. and procured from K5GW along with the dish. His system noise figure at the time was 2. For other F/D is possible use with choking collar like VE4MA feed. • AMSAT recommends to keep your own signal in the same range as the CW beacon solid dish with VE4MA feed and a single 2C39 generating 100 watts output First weekend netted several QSOs including K5JL, K2UYH, K0YW, VE6TA, W5LUA, WA6PY. Jul 06, 2020 · Courage Kenny Rehabilitation Institute Handiham World Weekly E-Letter for the week of July 6, 2020. W. 6. Practical implementation of the VE4MA feed. VE6NA, CW  23 cm feed horn, with relay and preamp as used for OX2K. The sub-refrector is designed 30cm diameter corresponding 10 wavelength on 10GHz. 7m Segment (mesh with 40% efficiency), Trvtr 0. Easier to construct than sheet metal square septum feed or VE4MA feed 2. 75” dia conical horn 9. 5dB NF 27 db gain + DB6NT design (homebrew) NF= Max 2. Pretty worried the bare PCB traces will pick up noise, so the tiny lengths of coax have ferrite rings over them and we'll see how it goes or if I need a metal enclosure/FM trap, etc. 5 x 0. W5GG used to make a pretty loud 1296 signal into south Texas along with W5HN. • Super-VE4MA. For prime focus dishes I would recommend using a VE4MA feed. hoke. Nearly everybody has the transverter and the IF rig mounted on the dish or below the dish and the assembly mounted on a sturdy camera tripod. TX line is a 16 meters of 7/8″ coaxial + 3 meter 1/2″ flexible  Sheet metal and feed probe parts for our VE4MA feed antenna. 3dB NF and SSPA 6 x MRF21120 with watercooling TX: 2320 Mhz / RX: 2284 - 2350 Mhz / RX: 2368 - 2452 Mhz Yaesu FT847 + XRef - 10 MHz-Locked Reference Oscillator + DB6NT transverter 10MHz GPS locked + microHam CW micro Keyer II 3,2m TVRO dish and VE4MA feed (~31 dBi Gain), home-made: Feedline: Andrew LDF5-50 Heliax (Tx), Andrew LDF4-50 Heliax 4 (Rx) Steering: Az-over-El, two actuators, custom Control hardware and software: TR Sequencer: "At Last" Sequencer (VE2ZAZ) 1. 2001 W5LUA works VE4MA, 24 GHz 2005 AD6FP, W5LUA and VE4MA work RW3BP, 47 GHz 2005 RU1AA works SM2CEW, 28 MHz 2009 GDØTEP works ZS6WAB, 70 MHz XMTR RCVR Transmitter Feed Line Receiver Feed Line Moon 210 K* Earth 300 K* Antenna Radiation Patterns * Noise temperature, Kelvins HBK0108 Page 31 and 32: Feed choices for 10λ diameter Dish; Page 33 and 34: References1. F/D . This permits the feed to be easily adapted to dishes with various f/D ratios, ranging from 0. Measuring Sun noise repeatedly between positionings is not easy because the antenna needs to be lowe May 01, 2009 · Feed efficiency values for old-crop (spring born) feeder lambs weighing 75 pounds and up in the fall average 5 to 5. 3; K0KFC W1GHZ Dual 10/24 GHz feed w/1. This is a free weekly news & information update from the Courage Kenny Handiham Program, serving people with disabilities in Amateur Radio since 1967. Be sure to support my sponsors, who make this series possible: – Gifts 4 Hams – R&L Electronics – Buy Two Way Radios Follow Me: YouTube Facebook Page! In a mesh dish the feed-horn “sees” the ground, 290K, through the mesh aperture and there is gain loss. Easy to tune by adjusting both probes for best VSWR . 7GHz you're looking for around 5-6" diameter. This team measured all the pre-amps that were brought to the conference for testing. 5db below the VE4MA scalar ring feed using polarizer stubs. 2 12 foot diameter TVRO dish with VE4MA feed horn on 23CM (1296 Mhz) in early 90's. 6 to 0. 70 to 71 produced a consistent degradation of nearly 2. 0! Today's livestream was a good discussion about Field Day 2020, where I learned a few things myself. Gain vs Spacing. 10 / 23  20 Feb 2020 3 meter solid dish with VE4MA feed + G4DDK LNA. Septum + preamp. Practical use for dish with 0. 8 dB (SFU = 148) Moon Noise = 1. (b) the theoretical feed pattern (e. The Black Forrest uW Moon Bouncers, DJ7FJ(r), DL2GSG and their 4. 5dB, Earth=7. 3dB less sun noise is a version of the VE4MA feed 2 , a proven performer on all bands from 1296 up. examples and see what happens. Currently on the air. rxportRL. Hlavně ráno se&nbsp; podmínky jevily jako excelentní. 5 which mine is below making these feeds no good. We can offer Linear single band up to a 5-band dish feeds from 1-11GHz, Helix dish feeds with Left or Right Hand Circular Polarization from 1-4GHz, Dual Mode LHCP / RHCP Septum Dish feeds from 1-24GHz, High power single band illuminated by a VE4MA style feed. 200-250W from PE1RKI PA module. My first 1296 MHz system in 1997. Good illumination, spillover and phase efficiency 2. • VE4MA. 32, 250W SSPA, G4DDK preamp, OK1DFC septum feed with Super VE4MA choke. a ‘Super VE4MA’ choke ring. 34, VE4MA feed, G4DDK preamp 0. 66 foot dish. com. The VE4MA feed10 adds a choke ring around a circular waveguide feed to reduce side and back lobes, thus increasing feed efficiency by putting more of the   Yagi (6M) dish, VE4MA Feed 23cm non stick stone low casserole 5 year warranty on the non-stick coating. For a cylinder dish (mostly F/D from 0. I have a web 24 GHz DL7YC - RX tests: feed, LNA and TRX in the dish focus. a branch-line coupler (3 dB hybrid) Ham-band versions of this feed have been described by VE4MA for 1296, 2304 and 3456 MHz. The results suggest that there is a set of choke dimensions which can provide calculated efficiency for circular polarization nearly as high as the Super-VE4MA feed. Measurements: the radiation pattern of the feed Tadeja Saje, Matja z Vidmar Hydrogen-line and pulsar observations with a small antenna 9 / 23 Practical implementation of the VE4MA feed If you're serious about vinyl the new Accession is the phono The Accession stereo phono stage preamplifier uses patented technology which reveals much moreIncluded 3,8m dish, VE4MA feed, FHX35LGA preamplifier and PA with 2x2C39BA - 150W out, later TH338 1kW out. Looks like you have an f/D of 0. A third way is a parasitic resonator like the Koch/VE4MA feed, etc. 77 eff0. The comput- Hi! I'm in the process of tuning the position of the M0EYT-built X-band VE4MA feed on my 3. 4 m 75 W. 35 Kb Receive port Return Loss : rxportRL2. 32 ft stressed Dish at W6/PA0ZN (1983) before it got destroyed in a Santa Ana Storm 2320 Mhz: 3. 2 849 8 # K7XQ I1NDP JN45 OOO some degree, this spillover is a necessity, as the feed pattern must roll off slowly. 2; W9FZ 9x12x16” horn, peak signal off boresight 20. Check your dish f/D or chose a f/D for the dish. 9m dish, 3400-MHz EME will be implemented next by adding a VE4MA feed built by WD5AGO, purchased at SVHFS Conference in April, 2014. Retour site F5AYE: F5AYE. Because 5. VE6TA. 41 VE2ZAZ – January 2012 A Bit of EME History 1946: First experiments by US Mil. 71λ Ho; Page 43: VE4MA Feedhorns Jun 18, 2013 · 1lMalowanchuk, B. it 1kw sspa 4. Doug VK3UM was a friend from our days at Unley High School during the mid 1950s, a common interest was that of radio and electronics leading to our introduction to ham radio through the 288MHz band (now no longer part of Australian allocations). 4. 41. The feed is like SM0PYP deep dish based on a W2IMU and VE4MA, no nulling post. A choke with dimensions 0. Cheap and rugged (0. All rights reserved  The receiving system in all tests consisted of a VE4MA type feed and a 1. •Power output = 21 watts at feed •NF = 1. Figure 4-   Today's feed are either based on a paper by Kumar (and adapted to amateur use by VE4MA) or a septum feed. Antenna: 10 m dish f/D 0. 7/10/24/47 GHz and above - antennas, propagation, operating, etc. 35Ring position - wavelengths behind rimFigure 6Later, I tried much larger and deeper rings, and did find a peak with significantly higherefficiency (nearly 80%), for a ring with dimensions around 0. Below you find some of the bench drawings of our sessions: Please note that the correct diameter of the feedhorn should read 160mm, not 165. by bert modderman 10ghz and 6cm 5760mhz eme septum feed by bert modderman several 10ghz septum eme ve4ma feeds by bert modderman 3 meter solid dish with VE4MA feed + G4DDK LNA. 9; W0AUS 1 x 1. Round septum feed with super VE4MA choke 23 cm inside the 6,1 m Dish. It seemed too deep for familiar horns and I deciced to use it as an Cassegrain feed system. septum part is 100 euro and radiation part is 100 euro. 3 GHz, Images of stations. Dish was also effective for tropo and Oscar 13. WG run from centre of dish to feed carrying TX power, the dish feed point there is a WG22 switch, DB6NT preamp and scaled VE4MA style. 4 db (30 K) Antenna. VE4MA. This is the same scalar feed as VE4MA, but every step has a ring, so leakage of current of a limb is little. He has presented a nicely optimized dish feed for the amateur 5 cm (5760 MHz) band. Two preamplifiers, first a K2AH type with FHX35 (. Overview One of the most prevalent EME sustain horns has been the "VE4MA" Feed. Included 3,8m dish, VE4MA feed, FHX35LGA preamplifier and PA with 2x2C39BA - 150W out, later TH338 1kW out. Pouze&nbsp; v sobotu ráno a večer. 8m dish with VE4MA feed, LNA with PEMT FHX35, XVTR DB6NT, TS850 transceiver; PA with a parallel of 2C39 . VE4MA feed Power @ Feed 280 280 280 EIRP dBm 85. 6). 35 x 0. 0 Meter ( 10 foot ) 0. 25 x 0. 2,483 views. twitter. 4m • Mostly commercial types •Scale 23cm VE4MA feed to 3456MHz using 2. 5 kV ( peak 5 kV !!! Somewhere along the line I was playing around in 4nec with a ve4ma feed rescaled from L Band to C Band. Waveguide runs from the centre of. 05 0 0. The feed requires full-wave simulator optimization for a given parabolic reflector and is designed to operate simultaneously on two bands, offering LHC/RHC timeframe, when VE4MA first received W5LUA’s echoes, Al was receiving 12. See my 3400 EME Log (pdf). Feed itself and how the choke ring was soldered; Return loss was ok (-20 dB), could have been made better but I was lazy. 7 mm). ve4ma feed

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