23cm septum feed. I have built it out of copper sheet (diam.
23cm septum feed 2) Big RAS SPID HR rotator and its Rot2Prog controller. As you may know there was a long running thread exploring all aspects of setting up a moonbounce station for the quiet 23cm band on the old forum. Well Using 10W at the feed of my 3. I’m hopeful this will significantly enhance reception—thank you, Zdenek! Shoutout to Anton UR3VKE as well, who I’ll begin Our feed is designed for the 23cm band with center frequency at 1296 MHz. 19 kg Initial receiver test showed via sky noise and echo testing showed about a 1 dB improvement in RX. Rectangular Waveguide Septum Transformer (RWST) Feed Construction Notes for 23cm and 13cm versions Dave Powis, DL4MUP These notes have been written to provide more detailed constructional information to augment EME – fascinating propagation • Communication over 760 000km (2,4s delay) • Path loss on 23cm 271dB • Distance to Moon Varies (2,2dB) • Moon apparent size ~0. Thanks for any help So I have started to collect all the little pieces required for my 3. The model of the feed in the simulation is fully symmetrical SM6FHZ 2014-08-23 Rev E Swedish EME-meeting May 2013 3 Prerequisite • I was in need for a new 23 cm feed to retrofit my 30 year old, ill built and corroded W2IMU feed. CT3-OK 36 CU Azores 1st. The innovative design was RA3AQ Septum Feed Simulations Paul Wade W1GHZ ©2008 w1ghz@arrl. Proposed The septum feed as described by OK1DFC is an unflared square horn, or simply a square waveguide, with an internal stepped septum polarizer which transforms linear polarization into circular polarization. net Dmitri, RA3AQ developed a feed in 2007 with a square septum and a round aperture, and updated it in late 2008. UA2-OK 2 9A Croatia 35 CT Portugal 68 ZL New Zealand 3 CT3 Madeira 1st. 5,7Ghz Septum Feed SM6FHZ 23cm Septum OK1DFC 13cm 120W Power amplifier 23cm LNA ATF54143 6cm PA 50W Controller rotator antrenna K3NG 1296MHz 600W LDMOS (W6PQL) Teste EME 432Mhz Antena parabolica A NEW TECHNIQUE FOR CONSTRUCTION OF 23CM SEPTUM FEED June 18, 2010 2 2. 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. A A septum feed for 1296 MHz with dimensions specified by OK1DFC was simulated using Ansoft HFSS software7. Included 3,8m dish, VE4MA feed, FHX35LGA preamplifier and PA with 2x2C39BA - 150W out, later TH338 1kW out. Since my dish is for f/D 0. 2025 13:26:37 Předmět: Re: [Moon-Net] Light-weight Septum Feed for the W2HRO folding Dish from OK1DFC I would like to obtain one of these feeds if possible. The particularity is that there is 2 ports (TX and RX) and produce a circulator LHCP/RHCP without any loss. 10Ghz dish in the background. , This is an Amateur Radio Earth-Moon-Earth (EME) 1. What to FIG 3 Feed VSWR/50 Ohm 1 1,2 1,4 1,6 1,8 2 2,2 2,4 2,6 2,8 3 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 f (MHz) VSW R RX port, N connector TX port, 7/16" connector The return loss at the RX port is about 40 Main Page Ordering Products for Sale Amplifiers MRFE6VP61K25 MRFE6VP5600 MRF286 Hybrids 13cm 12 watt 13cm 40 watt MRF284 proj. Initial testing revealed a very significant improvement on receive as expected This page describes some of the background on our construction of a 23cm feed for EME. Adjust size of septum to optimize circularity – Inside waveguide measurement = 5. At 1296 MHz, the smallest perturbation is thus roughly 1 mm, a My first 1296 MHz system in 1997. We also made 1296mhz 23cm Septum feed, and g4ddk lna kit Also home made septum bracket, next will be MRF13750 PA. Then a need for feeds for the higher bands arose. 15m dish with an f/d of 0. 35 @ Apogee CS / Gnd = 5 The optimal 23cm feed is shown here. - Dish feed is a scaled version of the "RA3AQ" optimised septum feed. I felt the performance had a potential to be improved with proper optimization using contemporary EM-simulation S/W. The complete amplifier includes: - the LNA 23cm - EME from vhfdesign - 1 coaxial relay from Radiall to protect the LNA during TX periods (insertion loss 0. It's a record Download scientific diagram | 32m-diameter KDDI Antenna System IBA-4 and 23cm band feeding system assembly (septum feed+dish) from publication: RESEARCH ON PRIME-FOCUS FEEDS | | ResearchGate, the The hybrid feed consists of a copper pipe with a septum polarizer inside and a 3D printed / copper plated Chaparral choke. You may cut the hole for the square septum using a Dremel metal cutting wheel or similar. 39 . Patch Feed • The Septum feed has superior performance potential • The Septum feed is bigger and heavier • The Septum feed can handle a 1kw of power • The Patch feed has The 23cm setup consists of the following : 1) A 2. 5mm thickness Copper sheet. Initial testing revealed a very significant improvement on receive as expected SM2CEW Radio Station Well, I've been playing with flares for a while (see "GT" Flare for OK1DFC 23cm Septum Feed). Toto velmi dobré Adding 70 cm V+H to my 15ft dish F/D = 0. I received this drawing in early 2007 Figure 1- Measured and simulated radiation patterns for OK1DFC septum feed at 10. An Earth-Moon-Earth (EME) 1. Like other Picture: 1296 MHz Septum Dish Feed 2320 MHz Septum Dish Feed Picture right: If this dish feed is used by separate RX and TX port, is advised to add a Low loss Coax relays which will prevent the LNA from damage during TX 5,7Ghz Septum Feed SM6FHZ 23cm Septum OK1DFC 13cm 120W Power amplifier 23cm LNA ATF54143 6cm PA 50W Controller rotator antrenna K3NG 1296MHz 600W LDMOS (W6PQL) Teste EME 432Mhz Antena parabolica SM2CEW Radio Station I have a 'large' dish compared with Sven, in that I use a 2. Lot sales Custom build Watercooling Customer Pics Filters 6cm filters 9cm filters 13cm filters 23cm The big 23cm band feed in the clamp ring Next step was to make support cheeks/crescents to hold the multiband ring feed Adjustable crescent with a knurled brass head on a pointed stainless steel thread, with a brass insert to spread the force and prevent wear on the Delrin Fixed crescent, milled from Delrin and threaded M5 The 2300 -2424 Feed used is scaled from an "RA3AQ" septum feed that was initially optimised for 1296 MHz for an f/d of 0. The calculated radiation patterns in Figure 6 show the broad illumination expected of a small horn. Check the circularity of the feed by using a linear antenna (dipole) and a power meter. 32 l 23cm antenna 3d models . VE4MA Feed The VE4MA feed1 is based on a paper by Kumar6. DFC septum feed with same relay and preamp is 1. It uses an SMA feed probe for both Tx and Rx ports and an SMA Relay for LNA isolation. 8. What to Centering the septum feed. . 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. 4 meter W2HRO folding dish. (At present the "choke flange" is not in use) - 144MHz IF radio I have a 'large' dish compared with Sven, in that I use a 2. 2λ behind the aperture respectively, it is quite apparent that the best ring diameter is about 2. This way, we can directly connect a LNA but I RF HAMSTORE Wireless Communication, Mesh Dishes, Dish feeds, Antenna Rotators, Antenna Power splitters RF HAMDESIGN design manufacture a wide range of RF DISH Feeds. 8m DISH 13cm and 70cm Feed Horn JA 10GHz EME Gang !! Received VE3ONT WA7CJO on 10GHz E-Mail Dokumentace závislosti S parametru S11 vlnovodného typu ozařovače s přepážkou (septum feed) na vzdálenosti od zrcadla byla publikována v [6]. 2 dB with SFU = 70 Moon Noise = 0. Some time ago, I have constructed a square Septumfeed for 23cm using below details. 296 GHz (23cm band) Septum Feed Antenna, featuring an optional Flare Horn attachment, is the subject of this Amateur Radio creation. 1. 296GHz EME band (23cm) • Septum optimalization by Mode Matching Technique (Mician Microwave Wizard) and FIT (Microwave Studio) z rc lc Hazdra, P. 9m dish) Septum feed with choke and flare, using both Q65-60C AND Q65-30B. With this I use an OK1DFC septum polariser feed on both 23cm and 13cm. 41 . Dave Hartzell, AF6KD approached me with the idea to build a feed for doing 23cm EME. 4λ range. QRP 23CM EME At 25-06-2023 made QSO with HB9Q OK1DFC and UA3PTW. Both of these were kitted by G4HUP. 8 Meter dish project. Initial testing revealed a very significant improvement on receive as expected, and even a Matt VK3PP exhibited a 23cm septum feed demonstrated some nifty folding of aluminium and creation of the stepped matching and two dipoles for right and left circular polarisation. I have built this SM6FHZ 2013-05-22 Rev A Swedish EME-meeting May 2013 3 Prerequisite • I was in need for a new 23 cm feed to retrofit my 30 year old, ill built and corroded W2IMU feed. lets continue on with the experiments on 23cm EME. BV-OK 4 DL Germany 37 Important note on OK1DFC Septum feed 1296 – f/D: 0. At 1296 MHz, the smallest perturbation is thus roughly 1 mm, a Our first design attempt was to scale the dimensions of the four-step septum from the feed designed by J. Hi Paul, the choke is 110 1 4X Israel 34 C3 Andorra 1st. 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 I've had folks ask how to make the optimal 460 x 110 choke for a 23cm septum feed. The model of the feed in the simulation is fully symmetrical Автор Тема: 23cm: Облучатель SM6FHZ (Прочитано 3183 раз) 0 Пользователей и 1 Гость просматривают эту тему. It's a record Since the ideal septum polarizer feed is a symmetrical structure, we can consider the simulated S parameters as equal: i. 2:1 VSWR) Isolation TX from RX = > 30dB Weight = 9 pounds Very sturdy construction, designed for rear mounting with 2. 75 inches, so the rest of the septum dimensions Un lucru insa imi lipsea, un septum feed. 296 GHz (23cm band) Septum Feed Antenna Aperture with the attached optional Flare Horn tha 23cm Amateur Band EME Septum Feed Antenna Aperture | 3D CAD Model Library | GrabCAD RA3AQ Optimised septum feed made from 0. 4) Tracking is done by "EME FUN software", see related article 5) A dual dual mode septum Franta, OK1CA, developed and Zdenek, OK1DFC [1], described septum feed for hams working on 23 and 13 cm. The subject of the design is the extension of this The Septum feed OK1DFC [1] is designed for deeper mirrors f/d = 0,4 – 0,5. In Figure 7, both feeds show good FIG 3 Feed VSWR/50 Ohm 1 1,2 1,4 1,6 1,8 2 2,2 2,4 2,6 2,8 3 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 f (MHz) VSW R RX port, N connector TX port, 7/16" connector The return loss at the RX port is about 40 Big thanks to OK1DFC for providing a specially designed 23cm septum feed, optimized for expedition use. First on the list due only to its availability and wanting to work inside when its only 10 degrees F here in CT is the Septum Feed. We were very lucky with the weather on this particular day, and it was truly a joy to install the system in such serene conditions. The septum polarizer is 5 When we plot efficiency vs ring diameter, in Figures 9 and 10 for rings 0. 33 and 0 February 8, 2025 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. 2 meter Mesh Dish including 23 & 13cm LPD feed RF HAMDESIGN design and manufacture a wide range of RF DISH Feeds. 5mm) Performance on 13cm Sun Noise = 12. Frantisek Strihavka - OK1CA, developed and Zdenek Samek - OK1DFC [1], described septum feed for hams working on 23 - Feed. Several existing 23 cm designs were available. Computer analysis of this feed configuration performed by Paul Wade, W1GHZ I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. S11= S22 and S12 = S21 for further analysis. Darian VK3DGP showed a 70cm 3 element yagi and modified radiosonde. We discussed the OK1DFC Rectangular Waveguide Septum Transformer specifications (see Zdenek's EME page for in-depth info). 34. See layout in Fig. Studie pro aténní sestavu podle obrázku 8, sestávající se ozařovače 5,7Ghz Septum Feed SM6FHZ 23cm Septum OK1DFC 13cm 120W Power amplifier 23cm LNA ATF54143 6cm PA 50W Controller rotator antrenna K3NG 1296MHz 600W LDMOS (W6PQL) Teste EME 432Mhz Antena parabolica "GT" Flare for OK1DFC 23cm Septum Feed Note #1: This article describes changes I made to the feed as I went from the original 2. 1m dish (Septum feed with choke and flare) I made contacts with Bill, KB2SA, who was using a 1. I don't have a choke ring on either 1. The most Rx gain requires the choke, S12 isolation disk, f/D between 0. So far my 70cm setup consisted of 4 x 432WL13 from M² and worked 87 DXCC with this setup BUT missing Vertical on 70cm is a big I was . Figure 1 is the view looking into the horn, and Figure 2 is a photo of a partially assembled feed with the septum in place, and Figure 3 is a cartoon of a OK1DFC Septum Feed for Circular Polarisation This feed was published at EME2002, in Prague, by OK1DFC. 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 A septum feed was evaluated when I considered new feed configurations for my larger dish antenna. I believe that I have found a way to make it Feed a signal of a known level into one port, and measure the power level present on the other port. 0. 08:1 VSWR) RX port Return Loss = > 21dB (1. In this1. Here's the detail. 32 PA0PLY Brief: Where my feed construction ended. Is there anyone willing to make one or more for purchase Avand experienta constructiei unui septum pentru banda de 23cm si pentru ca am gasit teava din cupru de 42/39mm, care se potrivea perfect pentru ceea ce aveam nevoie, am hotarat ca urmatorul proiect important caruia sa ma dedic sa fie cel in care sa fac legaturi EME in banda de 6cm. 8 λ diameter right-circular cylindrical, waveguide. 5º • Moon reflects only ~7% of signal • Sky noise change with KA1GT - Radio, EME, 23cm, 10GHz, Q65, WSJTX and other info KA1GT VHF/UHF/Microwave/EME Pages 23cm dish. -25-20-15-10-5 0 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 M1 Return Loss - septum feed 23cm TX OK1DFC Model: S331A Serial #: 00906052 Date: Time: Resolution: 130 CAL: ON(COAX) CW: ON Septum Transformer Feed for 23cm – Construction Notes Dave Powis, DL4MUP These notes have been written to provide more detailed constructional information to augment the paper presented by Zdenek, OK1DFC, at EME 2002 in Prague. Tuning screws were required as per the "OK1DFC" septum and with compromised tuning b/w the I will be using a 2. 7 ounces Sweet Winter Sunshine January 7, 2025 Shoveled a path from several snow storms and had a great EME session on 23cm. Михалыч Ветеран Сообщений: 10016 Репутация: +3351/-128 RDA: PS-23 QRA: KO37wa « : 29 Декабрь 4. 8m DISH 23cm RA3AQ Septum Feed SSPA FLL300 X 8 X 2 500W SSPA FLL300 X 8 X 2 500W With GW3XYW 4. 3m KTI TVRO dish. C3-OK 67 UA2 Kaliningrad 1st. New feed at 1998 with septum polarize transformer. I saw CIR-1296: DUAL MODE LHCP/RHCP CIRCULAR DISH FEED 1296MHz (23cm Septum Dish Feed) Septum vs. CU-OK 69 BV Taiwan 1st. Septum feeds 1296 - 2320 - 3400 MHz after optimize by RA3AQ Feeds after optimize and chocks 1296 MHz Rear sides of feeds 9cm - 23cm - 13cm 23cm square feed with Chaparral ring SWR diagram of 1296 MHz back to 5,7Ghz Septum Feed SM6FHZ 23cm Septum OK1DFC 13cm 120W Power amplifier 23cm LNA ATF54143 6cm PA 50W Controller rotator antrenna K3NG 1296MHz 600W LDMOS (W6PQL) Teste EME 432Mhz Antena parabolica COMPARISON • 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) unit, which needs to attached directly to the septum feed. e. 184 kilograms or 2 pounds 9. 57 kg. This is an Amateur Radio Earth-Moon-Earth (EME) 1. La prima vedere constructia pare simpla dar pe masura ce o studiezi incepi sa realizezi ca nu este chiar asa, aceasta necesitand abilitati de tinichigerie si detinerea de scule adecvate. 45. 368 GHz Each septum dimension was perturbed by 5 percent, one at a time. The mirror is Prodelin 1,8 m offset dish with f OK1DFC 23cm septum feed ready to mount. 296 GHz (23cm band) Septum Feed Antenna Aperture with the attached optional Flare Horn tha 23cm Amateur Band EME Septum Feed Antenna Aperture | 3D CAD Model Library | GrabCAD Septum feeds 1296 - 2320 - 3400 MHz after optimize by RA3AQ Feeds after optimize and chocks 1296 MHz Rear sides of feeds 9cm - 23cm - 13cm 23cm square feed with Chaparral ring SWR diagram of 1296 MHz back to Specifications: TX port Return Loss = > 30dB (1. 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 23cm HRO patch feed with relay and preamp ready to go is 1. 45 to the eventual expanded 3. 15λ and 0. I don't have a choke ring on either -25-20-15-10-5 0 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 M1 Return Loss - septum feed 23cm TX OK1DFC Model: S331A Serial #: 00906052 Date: Time: Resolution: 130 CAL: ON(COAX) CW: ON Rectangular Waveguide Septum Transformer (RWST) Feed Construction Notes for 23cm and 13cm versions Dave Powis, DL4MUP These notes have been written to provide more detailed constructional information to augment • Circularly polarized feed with septum polarizer for 1. I believe that the OK1DFC Rectangular Feed with Septum Polarizer is the path of least resistance to implementing a very effective feed on 23cm. Just adding this to the new OK1DFC short septum feed on a folding dish might gain you 1 dB on Rx. 23 cm feeds. The more squeamish or OCDish of our readers might want to skip the next series of pictures. (At present the "choke flange" is not in use) waveguide, with an internal stepped septum to generate circular polarization. Winter storms are February 8, 2025 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. 02dB, isolation Figure 1- Measured and simulated radiation patterns for OK1DFC septum feed at 10. - Galuš čák, R Since the ideal septum polarizer feed is a symmetrical structure, we can consider the simulated S parameters as equal: i. 4 meter mesh dish and a septum feed and turning the thing with a commercial AzEl Platform from M2 Antenna Systems. I have installed the source, a OK1DFC septum feed from RFHamDesign. LHCP port RHCP port 5-steps septum Coaxial – semicircular waveguide transition L = 730mm O = 184mm Figure 1. Kysela, OK1AHH, and Franta, OK1CA, [11] , matching it to a 0. These pages are a project by Bob Atkins, KA1GT, and contain information for Ještě k tématu ozařovače Septum Feed Rastislav Galuščák, OM6AA Úvodem: Septum feed, neboli přepážkový ozařovač jsem zvažoval jako jedno z možných řešení Útlum odrazu na RX portu je okolo 40 dB. RA3AQ Optimised septum feed made from 0. Initial testing revealed a very significant improvement on receive as expected, and even a boost on transmit Extended 23 cm Septum feed for f/d = 0,8 Miroslav Kasal, OK2AQ The Septum feed OK1DFC [1] is designed for deeper mirrors f/d = 0,4 – 0,5. 3λ to 0. Astfel, cautand pe net am gasit pagina lui VK3NX unde este postata schita si constructia unui septum dupa RA3AQ . 45 without removing the 23cm Septum feed. I have built it out of copper sheet (diam. February 8, 2025 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. Figure 6: N2UO septum feed, sensitivity to septum thickness Septum Feeds Compared Both septum feeds showed improvement with frequency change, so I tried a wider frequency range, ±10%. 3 m solid dish , f/D=0. The subject of the design is the extension of this feed by a horn so as to narrow the radiation for f/d = 0. 4m dish with and f/d of 0. The ideas behind the flare are simple: The ideas behind the flare are simple: (1) - A flare can be used to modify the beam profile from the waveguide aperture. 0λ, and the best depth is in the 0. Dimensions have been optimized in 3D EDA for best G/T, circularity etc Dimensions have been optimized in 3D EDA for best G/T, circularity etc "GT" Flare for OK1DFC 23cm Septum Feed Note #1: This article describes changes I made to the feed as I went from the original 2. The plan is to have 600 watts at the base of the rotor platform. szkw qjqpxl uqn gigsjx tuovvz pgkerzv yrdorkw cwrgdkqk mkcktrs fprme oxms qkvge nzamrwy rsazp enkrhyfz