23cm dish feed 6 METER FOLDING DISH BEHIND THE CONDO - W2HRO PROTOTYPE 16 STATIONS WORKED THE FIRST EVENING BIGGER IS BETTER UP TO A POINT THE 2. Frantisek Strihavka - OK1CA, developed and Zdenek Samek - OK1DFC [1], described septum feed for hams working on 23 and 13 cm. The ideal dish feed system does no… Pointing your feed into the dish will result in a reflected wave from the dish entering the feed. Unfortunately, a 21 cm band requires a quite massive receiver so A septum feed was evaluated when I considered new feed configurations for my larger dish antenna. -The amplifier in use is a Spectrian amplifier running at a "cool" 120 W - LNA is a 'WD5AGO" preamp with 26 dB of gain and a claimed Noise Figure of 0. 0. was boardbuilt 3ring for dish (yes it was big in the dish!) worked 9 stations with solid state 120W in contest! 1 on SSB, Heard 28 stations, ~ 9. What do you recommend? 73 Heinz Skip Macaulay May 30 #51489 - A homebrew transverter based on the DEMI board is used for 2300-2304 MHz. One obvious choice for a circularly-polarized feed would be a short helix. 45 (Prime Focus) * Waterproof * Weight: 460 Jul 1, 2008 · Dish Feed Systems An ideal dish feed system should pick up signals equally well from the whole surface of the dish, and no signals whatsoever outside of the dish. We have over 32 years of experience designing and building antennas and systems to satisfy the ever expending communications needs. This setup is used for 23cm EME and is a Bundle setup completed incl all parts to start with EME (Earth-Moon-Earth) communication Not included is a Preamplifier, Receiver, Transmitter, coax cables, Tri-Pod/tower, etc etc. The subject of the design is the extension of this feed by a horn so as to narrow the radiation for f/d = 0. 4 m on the 23 cm band), gain is approximately 28 dBi. VA7MM 23cm EME Station Dish from the rear showing counterweights, altitude actuator, mount, and feed. I found that most of the dimensions are quite forgiving, but one dimensions is surprisingly sensitive and deserves careful attention. next page has information about my dish’s Azimuth/Elevation control. In fact, most manufacturers of round feeds specify a dish with a nominal f/D of 0. UPGRADE of previous OK1DFC feed with RA3AQ circular wave guide Septum feed by Dima RA3AQ for 1296 and 2320 MHz Septum feed by Dima RA3AQ for 1,2 - 2,3 - 3,4 GHZ 0,36 F/D Septum feed RA3AQ for dish with F/D 0,4 Septum feed for dish F/D 0,5 - 0,55 by Dima RA3AQ Probe for RA3AQ feed with 7/16" connector New dual feed with round septum OM6AA Dimensions of the feed mount were approximated using Dave's pictures and finalized by taking physical measurements of my dish feed support arms and the feedhorn. REQUEST OR ORDER glad to E-mail you a quotation, or use the Quote request page. 35 to 0. Highlight was the CW QSO with Ivo ZS6AXT, who was using a 5 meter dish. 7 m with an F/D of 0. 45 S-Band Dish feed * Horn feed N-connector Female * Linear Polarization H or V / Optional: H & V * Return loss > 25dB * Band width: 100MHz (R/L >15dB) * Horn Dish feed can be tuned from 2100-2450MHz (Specify Center Freq. Feb 10, 2025 · Light-weight Septum Feed for the W2HRO folding Dish from OK1DFC Septum feeds 1296 - 2320 - 3400 MHz after optimize by RA3AQ For a dish, it's all about making sure that the feed only illuminates the dish, minimising "overspill" where the feed looks at the hot ground behind the dish, and of course mounting the preamplifier close to the feed. 29dB - Feed. . Jul 4, 2011 · Some texts I have read suggest a horn with a rectangular aperture is best suited to an offset dish, whilst feeds with a round aperture are best used with prime dishes. Note: When a dish is ordered as a complete DISH KIT inc Dish feed, all hardware is in the kit. The plot below shows gain over f/D with the dual mode feed in the focus (vertical axis : Gain in dB, horizontal axis f/D , D=6m) 23, 13, 9 and 6cm Dish-feed on one cable. 3 to 0. io Topics 23cm dish feed, discussion on UKmicrowave, the patch Date Date 1 - 1 of 1 EME dish feed optimization - what f/d? We often see statements that a given feed design is optimized for a dish with a certain f/d ratio. Thanks to K2UYH and all my other Elmers. It is a design that has been in use by various OK stations, on a number of microwave bands from 23cm to 3cm, for some time. While these elements may interact, each has a separate function and may be analyzed Sep 18, 2020 · Tony G8DMU has a 2. 26dB region, I see around 12. The first decision was the easy decision, what feed to use on 23cms? The W2IMU horn was the obvious (and only) choice as the interaction between it and the 70cm feed system should be minimal as the dual dipoles could be arranged in a similar way without impinging significantly upon the 23cm feed. Follow the links from my Septum Feed page to the EME2002 site – you can download Page updated 2005 August 7. But what does this mean? What is "optimized"? The performance of a parabolic dish antenna depends on how the surface is illuminated by the feed. However, my previous investigation into helical feeds3 suggested that they are better suited for offset-fed dishess than for conventional prime-focus dishes. I made up a quick-detach support ring to fit an RF Hamdesign multi-band ring feed, but Tony’s 23cm feed is larger, so I made up some extension blocks and a set of cheeks and spiders to support the different feeds. Drill out after the rest of the marking out is done. Nov 6, 2023 · Dish antenna is another option for Moonbounce on 23 cm. 45) This MESH DISH KIT is easy to assemble, 20mm square tube aluminium is used for the 12 rib contruction which are pre-assembled and ready to place at the 20cm, 10mm thickness CNC Milled aluminum centers. Sep 5, 2025 · September 8, 2025 Having spent the last two moon rises operating around perigee with several stations I have some results for 1. We will be glad to E-mail you a quotation for your own frequency request, or use the Quote request page. Suitable for antenna testing VK2-Microwave-Users-Group@groups. Got 24” Actuator Jan 2005: Got metalwork kit from G4HUP for OK1DFC 1296 Feed. 35 - 0. 2 Meter dia. CNC Milled Dish feed clamp for use with a Dual Mode Dish feed This mounting bracket is designed to use with a 4-leg dish feed support which is standard supplied with 3 or 4. 45 to 0. These large holes are access for the connection to the 13cm The prime focus dish is well understood. net Ostalo UKV tehnika Feed za dish na 23cm Feed za dish na 23cm Jan 27, 2019 · In the previous article, I describe a low noise amplifier for the 21cm band. 10Ghz dish in the background. 55dB. CHOICE OF 70cm FEED Switch-able Dual Polarity. 1m mesh dish, which has an f/d ration of around 0. Most of the readily available dishes large enough to provide high gain at L and S bands are the “Big Ugly Dishes” recently used for C-band TVRO — deep dishes 3Meter Dish mounted at tower (click) RF HAMDESIGN 3 Meter PRIME FOCUS MESH DISH KIT (F/D=0. All those who I spoke to about feed said” Built it and it worked” Gave up! As a result from my measurements, together with experiences from the past, I tried to find a simple formula to calculate what equipment is necessary on 23cm to detect echos, make QSOs in WSJT (assuming decode at -25, no deep search and call3. Oct 16, 2022 · The antenna for 1296 MHz EME is my 5. The mirror is Prodelin 1,8 m offset dish with f/d = 0,8. 7 metre EME receiver My experimental receive only 23cm EME setup. Septum polarizer provides excellent circularity with no tedious tuning adjustments required Mar 1, 2024 · Get the dish finished and start mounting the feed, the isolation relay, LNA, TX/RX lines and +12V control lines that powers the LNA and isolation relay. 3dB NF and SSPA with 8 times XRF286S watercooled. 23cm 5el Backpack and Dish Feed Antenna 23cm5RA Wide Angle. I want to use 1 low loss cable from the antenna to the shack, and no active parts in the antenna mast. 2 m sized dish for 1. 7m Andrew dish f/d 0. 65λ. Nov 30, 2003 · OK1DFC Septum Feed for Circular Polarisation This feed was published at EME2002, in Prague, by OK1DFC. 2024, 23:16:24 Home hrvhf. (no matching or transition sections . Assembled dish. 37. Next step will be to look into making a more optimal feed for this dish on 23 cm. 73 -. EME Moonbounce Station Introduction 1296 MHz (23cm), 3m mesh dish, 200W at Feed Home Hashtags vk1-reflect@groups. The 23cm circular patch dish feed To try some EME tests on 23cm I made myself a dish feed following the design of SM6FHZ and SM6PGP Find the original publication here For coupler I use a hybrid made out of 4 pieces quarter wave coaxial cable. dipole to System looks good, and I am expecting that will move with the dish easy. 34 and a G4DDK preamp with a noise figure which is probably in the 0. On March 19th 2000, he worked on 23cm 10 CW stations random within 3 hours, transmitting with this small antenna. Taken separately, each feed is known to work well; radiation patterns and calculated dish efficiency may be found in the W1GHZ Microwave Antenna Book — Online2. With advancements in feedhorn designs, efficiencies up to 67% are possible with antenna temperatures (Ta) in the range of 30°K as calculated and measured on a 20λ diameter dish(1). 3M)dish with Patch feed Are you sure you wish to delete this message from the message archives of Moon-Net@groups. Commissioning Visited the hardware store and obtained stainless steel bolts to replace all those holding dish together. io Topics Simple dish feed for 23cm Date Date 1 - 20 of 25 1296 MHz EME 23cm EME VK3NX23 cm Equipment - VK5EME Transverter kit with 144 MHz IF - Local Oscillator is "G8ACE OCXO" - Power amplifier is homebrew XRF286 (Running at 300 W CW and 400 W PEP SSB - High Power permit issued from ACMA) - LNA is WD5AGO 32dB gain with NF= 0. 8mm mesh Dish feed is as an example = not included standard delivery General: * All mesh dishes are standard supplied incuding an CNC Milled HUB of Aluminum and an heavy duty mast clamp, max diameter clamp 52mm. 34, VE4MA feed, G4DDK preamp <0. Listed under the Antennas/23cm category that is about Antennas for 23cm band. 6) consisting of 12 ribs and the center hub. This 3. txt), CW and SSB (depending on personal skills). inter-reaction minimal) Constant impedance matching (50 Ω (no matching or transition sections . 5dB sun noise from the quiet sun. A small TVRO dish (10 or 12 foot diameter) will easily have the gain of 32 or 48 yagis, the advantage of robustness, simplicity of feed mechanism, and easily obtained CIRCULAR POLARIZATION (so no FaradaySpatial Offset problems, as already mentioned). This has increased the isolation between the receive and transmit ports by about 10dB. DJ-G7T Alinco, tri-band handheld radio also covers 1. High efficiency feeds often have a larger blockage shadow, so the septum feed may be the best performer on a small dish where circular polarization is required. Horizontal or Vertical polarization. For i/2" mesh with 1mm diameter wires at 23cm with circular polarization this result in 0. Is the dual band feed as good as the individual feeds, or are there unexpected interactions that spoil the performance? Back fire helix feed for 23cm 1. An antenna with a reflector diameter of 20λ has a feed-to-dish diameter ratio of . 13cm Reflector The 23cm section is as follows , the 112mm diameter section is driven element. Mar 22, 2021 · Spent several hours tweaking the dish feed for sun noise (7. When the moon is visible You can't do a visual sighting Feb 6, 2019 · The straw that broke the camel’s back was that when winter set in late last year, the 5 band ring dish feed cracked open (again). 23cm - two years ago, 2m-23cm EME contest. 375, retrofitted for EME use by VE7CMK DL0SHF 23 cm This is a view inside the solid-state PA behind the dish for 23cm. This 1. If you are interested in 23cm EME QSO, I'm ready for any CW or JT65 tests however I need stations with minimal 4m dish and 500W @ feed. The last few years this band has been my most interested band for tropo and aircraft scatter operation. After this experience I developed my first EME activities with the 3m dish in 2009. 0 Meter Mesh Dish Setup for 23cm EME is a Bundle setup completed incl all parts to start with EME (Earth-Moon-Earth) communication Not included is a Preamplifier, Receiver, Transmitter, coax cables etc. Wideband 13cm Dish Feed Antenna 13cm6 2300 - 2400 MHz. Use on your own risk. Dual Band L and S Band dish feed 2* N-Connector female. Also an excellent choice for linear polarization in deep dishes, use each port separately for linear polarization (i. Septum feeds 1296 - 2320 - 3400 MHz after optimize by RA3AQ What we often call a “feedhorn” includes several separate elements: an antenna which shapes the beam for improved dish illumination, a waveguide section (round, square, or rectangular), perhaps a circular polarizer, and an excitation region (waveguide, probe transition to coax, or other transition). io? This cannot be undone. To avoid effects from Faraday Rotation on this frequency, the use of Septum feeds for the dish was introduced. The calculated efficiency of this feed is not as high as some. LNA – G4DDK design followed by a 3 pole interdigital filter RX – Fun Cube Dongle Software – HDSDR and MAP65 Sun noise – consistently measures between 7 & 8 dB , Moon noise is undetectable EME Bundles Dish Setup options Due to the many requests we have summarized a complete list for an EME 23cm band Setup HAM Radio Station. The antenna feeder is the part of the feed system that has the function to illuminate properly the dish surface. All focused on dishes with a f/D in the 0. 6m dish (1. 8m SatTV dish extended by mesh) Feed: OK1DFC LNA: G4DDK ~0. On the picture is a prototype with serial production expected during April. I extended the ribs, resulting in a 2. ready to start sending RF down the wire and into the feed. Andy decided early in 2019 to have a go at EME on 23/13 cm plus putting together a station to work through QO100, the first geostationary amateur satellite. These pages are a project by Bob Atkins, KA1GT, and contain information for radio amateurs interested in weak signal work on the bands from 144MHz through 10GHz and above. 4dB for thinner, 0. Calculation is based on antenna gain of station A (dBi), antenna gain of station B (dBi) and power in dBm 23cm (1270 – 1300 MHz) Click on any bold model number below to view or download a PDF manual. Antenna 3m (10’) TVRO Satellite Dish, aluminum frame and mesh surface, f/D= 0. The coffee can horn antenna has just been made - took about 15 min Mar 11, 2012 · The high-gain antenna on my space communications array is based on a Fortec Star 120 cm dish. 1296MHz Septum Feed with Flare and Choke The latest incarnation of my 1296 EME system uses a newly constructed septum feed with a square to circular flare and a choke. Back fire helix feed for 23cm 1. 4 Meter Mesh Dish Setup for 23cm EME is a Bundle setup completed incl all parts to start with EME (Earth-Moon-Earth) communication Not included is a Preamplifier, Receiver, Transmitter, coax cables etc. V&H) for terrestrial communication. inter-reaction minimal) Constant impedance matching (50Ω). 5mm thickness Copper sheet. 4 region. 11:20 ish. 4 METER FOLDING DISH APPRECIATING W2HRO’S HANDIWORK. 5 dB sn I think 9cm - sun noise about 1 dB less Download 3M0 Dish EME Full Setup Due to the many requests we have summarized a complete list for an EME 23cm Setup HAM Radio Station. The DISH KIT is supplied with a 3 or 4 leg feed support, all assembling parts and 6mm square mesh Date 1 - 20 of 24Dish Feed 1296 0. Good to start tropo or EME as dish feed. Also can be mounted with my feed mounting system. Linear dish feed, F/D=0. As Introduction Dish antenna feeds employing septum polarization transformers, which transform linear polarization to circular polarization (CP), have now successfully proliferated throughout the EME community after facing some initial skepticism. * Delivery is including 3-leg dish feed support. at May 30 #51488 Hello everyone, What film or 1 mm plate do you use as a cover for a circular dish feed? The opening of my 13 cm feed is 95 x 85 mm. 5dB) as well as aiming process Thanks W2HRO and KB7Q to confirm some questions. Stations were much easier to work with stronger signals. 2 GHz band. While the calculated efficiency of this feed is not as high as some, the better ones have a larger blockage shadow, so the septum feed may be the best performer on a small dish where circular polarization is required. Dec 23, 2019 · microwave group newsletter. 4m mesh dish on his van. The new topic will begin with this message. Computer analysis of this feed configuration performed by Paul Wade - W1GHZ [2], gave good results. I operated from a QTH 23cm 5el Backpack and Dish Feed Antenna 23cm5RA Wide Angle. 185dB and an increase in noise temperature of about 6K. e. 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 Horn Dish feeds. It works quite well, especially after making sure my cables are run away from the mouth of the septum feed and covering the opening at the dish's center with some aluminum HVAC tape. Deep dishes with an f/d of 0. The nega-tive side to such an approach was that the pattern from the W2IMU would under illuminate KA1GT VHF/UHF/Microwave/EME Pages 23cm dish. Requirements for this are determined by the geometry, and the desire to optimize the geometry for either gain or low noise. All feeds can be mounted in front An excellent choice for feeding your small dish for the up-coming SK6OSO EME event (July 13/14, 2013) Feed it in quadrature for circular polarization. Zdenek’s paper should be read for an understanding of how the feed works, some examples of measurements and comparisons against VE4MA/W2IMU circular feeds. For many years the interaction and feed methods to illuminate dishes has always been a matter of conjecture. Ofcourse also available is a dish without feed. The dish is heavy under illuminated, but the antenna temperature is good with this feed. Its advantages are a wide illumination in both axis' without a large shadowing of the dish. It's optimized for maximum efficiency with dishes around 0. 5mm wires). Nominal 1/2" hardware clothe (Home Depot) on a dish would result in a loss of gain compared to a solid dish of around 0. 4M (2. 4 meter W2HRO folding dish. 45 we do have 23cm feed 23cm feed The next step in the development is the 2304 - 2320 MHz feed. (On request a 4th Dish feed support leg is available, refer price list) * For each Mesh dish with an F/D=0. Availble from 900 to 1800MHz as linear single band dish feed. A dish with 3 m diameter has been recommended, though some have been successful with 2. 5 meter RF HAMDESIGN dish For illuminating a parabolic dish with small f/D (around 0. With 400 watts at the feed my echoes are consistently averaging -20. 1625 ratio. I believe that the OK1DFC Rectangular Feed with Septum Polarizer is the path of least resistance to implementing a very effective feed on 23cm. Now tests and measurements will follow. They are already tested in my 10m dish and working great. The 70cm feed (dual polarity switching) is revisited in this article and provides the lowest practical loss system of this type. The level of the reflexion coefficient (Γ) will be dependant on the gain of the feed (G), lambda (λ) , and the focal length of the dish (f). Feb 8, 2025 · February 8, 2025 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. 4. The feed is supported on a fiberglass monopole support and is detachable. Most optimal, efficient, and easy to build is a classic dish antenna that consists of an actual dish that acts like a mirror and some receiver at the focal point. At this point, this might seem like a sob-story, but this is not the case. Since we have selected the dual mode feed, in our case f/D defines the gain. Today I want to show you a construction of the dish antenna where this amplifier was used. 2 GHz as well. 23cm antenna. in MHz if you want to order) * 50 ohm * RF Power: 1000 Watts * F/D: 0. Shown below is the finished feed, as well as some measurements of the feed at 1296MHz. The Dish is 1. Basic 23cm feed system for small dish setup Cliff Barrimore EME Moonbounce Radio Communications 4y · Public Hi All, a nooby to EME, and looking to just get in to some real basic stuff, I have a 9700, which I am looking to use 23cm mainly as a rx station just to get my head around it all, I lack a bit of space, but have an old 1m (could be 90cm) dish, I remember someone doing successful The first decision was the easy decision, what feed to use on 23cms? The W2IMU horn was the obvious (and only) choice as the interaction between it and the 70cm feed system should be minimal as the dual dipoles could be arranged in a similar way without impinging significantly upon the 23cm feed. 5 m parabolic dish with only 1 coaxial connection. I believe that I have found a way to make it even easier, and my experience follows below. LA3WUA itch… Since good measurements on CP feeds are difficult, and measuring sensitivity of dimensions would require making many feeds, I started to analyze sensitivity of two popular septum feeds, the OK1DFC square septum1 and the N2UO circular septum2. Jan 3, 2021 · The efficiency of my amp has dropped off, but I can still easily generate 350 watts that ends up being 275 watts at the feed - a comfortable level for the hybrid device that generates the circular polarity into the patch feed. So I have only 4m of Ecoflex15 coax and get 500W at the These notes have been written to provide more detailed constructional information to augment the paper presented by Zdenek, OK1DFC, at EME 2002 in Prague. Looking right down the axis of WHAT DO YOU NEED? ANTENNA CAN BE A YAGI (5 m GOOD; CAN BE SMALLER) PROB – LOSE 3 dB CROSS POL CIRCULAR STANDARD SOLVE - USE CROSS POL YAGI USE A DISH WITH CIR FEED (6’ GOOD, CAN BE SMALLER) Dual Band L and S Band dish feed 2* N-Connector female DUAL BAND ring dish feed L and S Band dish feed (For HAM Radio band: 23cm and 13cm (1296 & 2320MHz)) (Other frequency on request) 2 separate connector for each band Specification: * L-Band: tuneable from 900-1800MHz * S-Band: tuneable from 2100-2400MHz * 2* N-connector Female * 50 ohm * Polarization: Horizontal or Vertical * Power: L-Band Information about Howard Ling - G4CCH, 70cm, 23cm , 13cm and 9cm Moonbounce using CW, SSB and JT65. Prerequisite My presentation at the Swedish EME-meeting 2013 contained the following septum feeds: 2 designs for 23 cm, a 9cm design, a 6cm design and two 3 cm designs. 3 require a different feed than shallow dished with an f/d of 0. What remains to be seen is how well the combination works. 25 SOLVE - USE CROSS POL YAGI USE A DISH WITH CIR FEED (6’ GOOD, CAN BE SMALLER) ANTENNA CAN BE A YAGI Linear S-Band Horn Dish Feed (F/D=0. Spent many weekends trying to get it to match. 23cm circular patch dish feed To try some EME tests on 23cm I made myself a dish feed following the design of SM6FHZ and SM6PGP More info can be found here. The OK1DFC septum feed is probably the most popular feed in use today for 1296MHz EME. At the back of the dish I mounted a SSPA consisting of two PE1RKI amplifiers. This includes the feed septum and probes for axial ratio and S12 analysis. Dish illumination review The ideal illumination for a parabolic dish antenna would provide uniform energy over the reflector surface, with no spillover energy missing the dish. - The LO is a homebrew design and is reflocked to a 10 MHz GPS derived signal using a "VE1ALQ" PLL. Matej, OK1TEH Some pictures. The beauty of this "cage" approach is that it's fully adjustable allowing the feedhorn to be centred and tilted if necessary for perfect alignment. (minimal use of connectors . Real feed antennas do not provide this ideal distribution. is a blend of technical expertise and common sense approach to accommodating your needs. What are some of the ways to check dish pointing accuracy. 40 CNC Milled Aluminum Supplied incl measurement plot Mounted Waterproof CLX-2 mounting bracket available for HORN-3 Download Specifications sheet HORN-3 VAT Calculation: Listed Price is included Dutch Legal VAT, Deliveries to privat persons inside EUROPE is incl VAT, Outside EUROPE Excl VAT, Companies Nov 22, 2001 · Home | 13cm Patch feed G3RUH | 13cm Patch K3TZ | 23/13cm Patch Feed | My 60cm S-band Dish | My 90cm S-band Dish | My Vhf and Uhf Antennas | My 13 & 23cm Helicals | My 40W 23cm PA | L/S filters | Test setups | Eddy ON7UN's K-band RX For more information on my projects send me an Email: [[email protected]]. Excellent small wideband Yagi antenna covers 1240 to 1310. All rights reserved by authors. For feeding of dish, we will use my 23cm and 432 MHz feeds. a parabolic dish ring feed optimum resonance frequency of 1325mhz. MESH DISH KIT. The article is about building parabolic dish feeds for the bands 23cm and 13cm using minimal tooling. 23cm Horn feed 23cm feed in front of the dish The feed is mounted very stable in front of the dish. Ultimate-designed antennas calculated using full 3D EM Simulation Software. The 70cm Loop Feed is easy to build and performs nicely. 1M9 Dish + 2. On the link below you can find some examples of dish feeds and more. It uses an SMA feed probe for both Tx and Rx how to get qrv 23cm bandStop Russian war against Ukraine How do you get QRV on 23 cm band and what can you expect from this first microwave band Getting QRV on this band is not very difficult, but as with all bands the better your antenna and equipment, the better results you will get. Below you find a photo of the coupler. 9M dish and 900 watts at the feed Also hear recorded audio of a signal bounced of the International Space Station later on this page. 45 we do have Dec 23, 2019 · The article is about building parabolic dish feeds for the bands 23cm and 13cm using minimal tooling. Since 16th June I'm QRV 23cm EME with new home made PA made by OK1VPZ based on PE1RKI modules, 700W in CW and 600W JT65. 8. For many years I have been looking for a 4 band dish feed on my 1. 37 F/D ratio, so works well for F/D rations from 0. Best of the best Yagi antennas for DXing, EME, and contest work. Due to various circumstances in 1997 we lost this QTH and consequently the dish. Their success is due, in part, to promotion of the septum feed configuration in publications by Zdenek Samek, OK1DFC, [1] and Paul Wade, W1GHZ, [2] who Simulations in this section include precise 3D models for the dish and feed geometry, feed support struts and feed holder. 8m dish with f/D=0. Oct 10, 2025 · I will be at the PNW VHF conference this weekend and was wondering if anybody might have an extra 3cm antennas/feeds or a 23cm dish feed. Yaesu FT847 + XRef - 10 MHz-Locked Reference Oscillator + DB6NT transverter 10MHz GPS locked + microHam CW micro Keyer II Home made Transverter switch unit for 23, 13, 9, 6 and 3cm. length independent) Apr 18, 2018 · After we had found out that the problem with our parabolic dish was that the feed probably was broken, we finally had an undeniably good enough excuse to open it and take a look inside. 4, not critical) a ring feed can be used. This is a high-quality, large dish designed for motorized FTA reception of analog, digital, and high-definition programs on Ku band satellites. Focal distance of W2HRO 2. 3dBNf There you can download and hear recorded I/Q file of DUBUS CW EME Contest that was done on my system using AFEDRI SDR receiver + 1296MHz/28MHz transverter. With the exception of the DSE2314LYRM (K), DSE2414LYRM (K), DSE2324LYRM (K) and DSE2424LYRM (K), all our antennas are designed to be mounted to a vertical mast. If the feed antenna end fed 40 metriClick here |Antenna end fed 40 metri| Disclaimer View : 356 1M9 Dish + 2. I have built it out of copper sheet (diam. He uses a variety of feeds, and they are all different diameters. An optional low loss quadrature hybrid combiner is used with to this feed and generate circular polarized signals. Standard mounting allows 23cm to 70cm feed swap in 30 mins. 7. 6. Jul 20, 2025 · Parabolic Dish Ring Feed for 23cm A parabolic dish ring feed optimum resonance frequency of 1325MHz By: DL4MEA Hits: 856 | Votes: 4 | Rating: 2. - Dish feed is a scaled version of the "RA3AQ" optimised septum New portable dish feed1 - 4 of 4 1 CNC Milled Dish feed clamp for use with a Dual Mode Dish feed This mounting bracket is designed to use with a 4-leg dish feed support which is standard supplied with 3 or 4. The original ring feed, with the adjustable ends on carbon fibre This is quite adequate for amateur use, and the sloping septum might be easier to fabricate at higher frequencies. where the previously drilled hole from the 13cm feed point was done. - Dish feed is a scaled version of the "RA3AQ" optimised septum feed. All mounting material will be deliverd and is rost-free. 1. Running an optimization of the entire setup ( dish , feed , coin ) of the coin/metal disk dimension and position, revealed that the values found by trial and error were very close to the simulated ones. We have also used the dish since the higher performance CP feed developed on 23cm, 9cm and again on 6cm. Used with my 3. 2 pieces 50 Ohm and 2 pieces 35 Ohm. (fully variable polarity not possible as 23cm feed is in the centre) Commensurate with 23cm feed (got to fit !) (can’t impinge on 23cm feed opening . Unfortunately this dish never gave us the expected results on 23cm. Good to start tropo or EME as dish feed for dishes with f/d 0. 2dB loss of gain (0. RA3AQ Optimised septum feed made from 0. 35 and a novel bifilar backfire helix feed (more on that below). Subject of the new topic: Nov 30, 2003 · OK1DFC Septum Feed for Circular Polarisation This feed was published at EME2002, in Prague, by OK1DFC. I received also special white steel feed point keeper. All other units we will have same which I am operating here at home for EME. 5 meter RF HAMDESIGN dish Download 1296MHz, 1M9 Dish EME Full Setup Due to the many requests we have summarized a complete list for an EME 23cm Setup HAM Radio Station. May 31, 2025 · Cover circular dish feed oe1isb@speed. This 2. Both of these are drilled out with a hole saw to 25mm Dia. 45 should be used with their feeds. Initial testing revealed a very significant improvement on receive as expected, and even a boost on transmit. My understanding is that the 0. length independent) Lowest feasible transmission loss. Jun 14, 2018 · The first decision was the easy decision, what feed to use on 23cms? The W2IMU horn was the obvious (and only) choice as the interaction between it and the 70cm feed system should be minimal as the dual dipoles could be arranged in a similar way without impinging significantly upon the 23cm feed. Using the Feed Remember that the feed has a beamwidth of about 130 degrees – so is best suited for dishes of around 0. 35 f/D. At a diameter of 1m, the dish offers about 20 dBi of gain which is the planned 23CM 1296 Mhz: 3. 43, feed is a RA3AQ design. X-Band HORN dish feed, tuned to 10368MHz or custom made. For alternate mounting, please let us know when you place your order. LNA – G4DDK design followed by a 3 pole interdigital filter RX – Fun Cube Dongle Software – HDSDR and MAP65 Sun noise – consistently measures between 7 & 8 dB , Moon noise is undetectable Oct 30, 2020 · The key part of the project - the small W2HRO folding dish antenna with patch feed has shipped. Failed. 45) S-Band HORN F/D=0. Paul's design work and implementation is amazing, my bet is that it will allow many more folks to play 23cm EME going forward. The LNA is an old DD1XF cavity, based on the DJ9BV design and equipped with a MGF4919. Both these radios tune to 174 MHz with no noticeable / measureable difference in Rx sensitivity. With a dish diameter of 10λ (about 2. 5 db near perigee. 5 Meter "Cooker" dish on the 23cm band. Last updated: 11/22/01. I hope this will Apr 14, 2025 · How to create a square to round extension for a 23cm septum feed using sheet aluminum CHOICE OF 70cm FEED Switch-able Dual Polarity. October. KB2SA (1. For example, consider various diameter dish antennas having the same primary feed consisting of a simple waveguide with diameter 0. 5mm) Cross-Band Capability - The tunable IF is usually an IC-746 or an IC7700 with 2m xvtr. The nega-tive side to such an approach was that the pattern from the W2IMU would under illuminate Download 2M4 Dish EME Full Setup Due to the many requests we have summarized a complete list for an EME 23cm Setup HAM Radio Station. Constructing dish feeds for these frequencies normally involves The gain which is defined by the geometry of the dish (f/D) and the radiation pattern of the feed. Another user of light feed, Douh K6JEY Hi All, After further testing on the moon, the Septum is a winner. Some years ago I got an old 2m dish (f/D=0. Connector N-Female. The larger section is 168mm diameter and is the reflector. The nega-tive side to such an approach was that the pattern from the W2IMU would under illuminate M2 Antenna Systems, Inc. (Some parts on the picture are not part of standard delivery) This PRIME FOCUS MESH DISH KIT can be shipped world wide: This Prime Focus MESH DISH is a "DO IT YOUR SELF KIT" (see picture on the right) and available with several F/D's and diameters Supplied including dish feed or with out, just as you prefer ! Available 2 Dish Kits: #1 Dish KIT Max useable the feed or for mounting LNA, etc. Needless to say, attention to detail and careful measurements are not optonal for a project of this nature. 5 m dish with a f/D of 0. The gain is affected by at least 1 dB. The patch feed attaches to its support with a simple twist and click. I started with using the old W2IMU dual mode feed horn for 23 cm EME. . I built a feed that combines a KU band horn for free-to-air (FTA) satellite reception with a helical feed for transmission and reception in the amateur L-band The Septum feed OK1DFC [1] is designed for deeper mirrors f/d = 0,4 – 0,5. You will need to experiment with choke collars and /or flaring of the mouth of the feed to properly illuminate other sized dishes. 23, 13, 9 and 6cm Dish-feed on one cable. 45 f/D feeds have a wider angle of radiation, and that some of this will spill How does a Dual Mode Circular Dish feed Work ? placed the feed in front of the dish, but if you prefer it can be done by use of a scalar network analyz r to setup the port At the picture right you can see how the Dish feed is build and uses the inside parts of the wave guide. ANTENNA Specifications and designs are subject to change without notice. 2 meter Mesh Dish including 23 & 13cm LPD feed RF HAMDESIGN design and manufacture a wide range of RF DISH Feeds. The dish with the patch feed was never better than -24 db Oct 7, 2010 · Antenna: 2. FIRST ANTENNA - 1. But In a few words, a fully matched 1. 0325 while a smaller antenna with reflector diameter of 4λ has a larger, 0. Future plans to build standard mount for Septum Feed. LIGHT WEIGHT AND COMPACT PATCH FEED A dual linear polarization patch feed is available for use with the folding dish. Without a 23cm beacon on the moon there aren't many options that I am aware of. My station has been on and off the air in the USA since around 1978 and I was on the air in the UK as G8EKB in the early 1970s. 9 Meter Mesh Dish Setup for 23cm EME is a Bundle setup completed incl all parts to start with EME (Earth-Moon-Earth) communication Not included is a Preamplifier, Receiver, Transmitter, coax 11.