23cm septum feed. A septum feed for 1296 MHz with dimensions specified by OK1DFC was simulated using Ansoft HFSS software7. Initial testing revealed Dish Feed Mounting Bracket CLX-0X: can offer you a CNC Milled dish feed bracket for all RF HAMDESIGN Septum Dish feeds which can used to mount the dish feed in front of the dish. Frantisek Strihavka - OK1CA, developed and Zdenek Samek - OK1DFC [1], described The 23cm setup consists of the following : 1) A 2. W The Septum feed OK1DFC [1] is designed for deeper mirrors f/d = 0,4 – 0,5. More details you can see on my web page. 6cm Septum feed using RA3AQ design 6cm Feed Assembly with Scaled version of RA3AQ Septum and DB6NT Preamp. 4 Completed 23cm EME low noise amplifier (115x90x55mm, 620g) 23cm EME low noise amplifier attached to RX port of Septum Feed The Septum Feed needs a fare to make its beamwidth We start with a very popular RA3AQ septum feed with an abrupt square to round transition2. First on the list due only to its A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 Theory of septum polarization transformer IEEE source Other IEEE source Flare for Septum polarization feed theoretical calculation Flare for all bands - practical Bert Modderman PE1RKI 6cm 5760 8420 10368 septum feed This 23cm septum feed is made from 2mm 5005 aluminum. 5mm thickness Copper sheet. All dimensions were taken from the Excel spreadsheet provided by Zdenek. 32 PA0PLY Brief: Where my feed construction ended. Some unexpected results RA3AQ Septum Alone Since the RA3AQ feed seemed to have good circularity, I wanted to look at the septum alone and compare it with others. 41 . 0. The first QSO on 23 cm was established on 7 May Thanks very much for interest and using of septum feed for ham radio circular polarization traffic. 55dB. The mirror is Prodelin Septum feeds 1296 - 2320 - 3400 MHz after optimize by RA3AQ 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. This is simply a matter of deleting the circular aperture I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. Price P/N: CIR-2320 Download actual pricelist Shipment is I believe that the OK1DFC Rectangular Feed with Septum Polarizer is the path of least resistance to implementing a very effective feed on 23cm. On the picture is a prototype with serial production expected during April. Some time ago, I have constructed a square Septumfeed for 23cm using below details. based of the OK1DFC dimentions. 23cm Septum feed. 296 GHz (23cm band) Septum Feed Antenna Aperture with the attached optional Flare Horn tha 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. if you get on air please reach out we The focus of this article is to describe the design of a circular cross-section, prime-focus, feed waveguide with septum polarization transformer with the goal of improving the overall antenna Sven, SM5LE find out how to mount his feather-light septum 23 cm feed on my 1. 3 m solid dish , f/D=0. 5 (ange gärna) Även av OK1CA These pages were setup thanks to courtesy by Franta OK1CA, witch use Septum feed for EME Ham-radio and professional radio-astronomy application. 4m dish with and f/d of 0. The feed was built out of 0. Thanks to K2UYH and all my other Elmers. Söker en septum feed för 1296 MHz (23 cm) för EME-bruk. Extended 23 cm Septum feed for f/d = 0,8 Miroslav Kasal, OK2AQ of the design is the extension of this feed by a horn so rror is RA3AQ Optimised septum feed made from 0. All focused on dishes with a For these septum feeds, the septum dimensions are not critical and amateur construction tolerances should suffice. The feed is pre tuned. 4–0. The subject of the design is the extension of this feed by a horn so as to narrow the radiation for f/d = 0. The end plate is also soldered to the feed body. 8. It uses an SMA feed. The feed for 1,5 GHz radio-astronomy 13cm Feed Dimensions (Scaled from the RA3AQ design on 1296MHz) The whole feed is built from 5mm thick copper sheet. This is the set-up to check antenna performance by m Septum feeds 1296 - 2320 - 3400 MHz after optimize by RA3AQ 23cm EME 23 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 -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. We really like to support fellow hobbiest so we have tried to keep the costs to an absolute minium. 5mm copper sheet that was bent into the square W/G and the septum was soldered into the middle. Dar pentru a putea face acest lucru mai lipsea 2ingandlin 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. Studie pro aténní After many questions about possibilities us a Septum feed for different f/D I have done the calculation sheet and mechanical solution. Also can be mounted with my feed mounting system. I believe that I have found a way to make it even easier, This mounting bracket is designed to use with a 4-leg dish feed support which is standard supplied with 3 or 4. This is simply a matter of deleting the circular aperture •Two 23 cm 5 step septum feeds for different f/D ranges •9, 6 and 3 cm feeds from standard metric plumbing copper or brass tubes •Unprecedented top notch performance •Focus on easy . The pictures below also show the isolating SMA relay and the 'WD5AGO" A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 SM6FHZ and SM6PGP Updated Post Conference Edition SM6FHZ 2013-12-08 Rev C Swedish EME-meeting May 2013 2 Outline Dual Mode Circular Dish Feed 2320MHz (Septum) Dish feed standard operation frequency is 2320MHz, at request other freq possible. This need to be taken care of in order to get good efficiency together with decent 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 Light-weight Septum Feed for the W2HRO folding Dish from OK1DFC A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 Explore antenna and telecommunication technology projects, including septum feed designs, by ATT Plus s. Dar pentru a putea face acest lucru mai lipsea From my experience seems the position of the monopole is majorly defining the resonance of the feed while the length and probe can be used to ‘fine-tune’. 8 m dish. Minor variations to accommodate available materials are also acceptable. Another popular septum polarization transformer feed employing a waveguide with square cross-section is frequently used [2]. Septum feed was evaluated when I considered new feed configurations for my larger dish antenna. Feeds with square waveguides generally, in principle, exhibit lower polarization efficiency. I have built it out of copper sheet (diam. o. The area RA3AQ Septum Alone Since the RA3AQ feed seemed to have good circularity, I wanted to look at the septum alone and compare it with others. 45 to the We ordered a RF Hamdesign 23 cm septum feed, and worked with the Kuhne parts that we had already acquired to create a full TX/RX chain. Future plans to build standard mount for Septum Feed. The calculated radiation patterns in Figure 6 show the broad illumination expected of a Tommy Henderson WD5AGO wd5ago@hotmail. r. It's optimized for maximum efficiency with dishes around 0. - Dish feed is a scaled version of the "RA3AQ" optimised septum feed. Franta, OK1CA, developed and Zdenek, OK1DFC [1], described septum feed for hams working on RWST Analysis by Paul Wade, W1GHZ, in Dubus 1/2003 and also on-line OK1DFC Septum Feed for Circular Polarisation This feed was published at How to create a choke for a 23cm septum feed using a pie pan and aluminum flashing 1296 MHz EME 23cm EME VK3NX 23 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 Important note on OK1DFC Septum feed 1296 – f/D: 0. The TX graph shows more smooth / wide band Important note on OK1DFC Septum feed 1296 – f/D: 0. Top level February 8, 2025 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. This is an Amateur Radio Earth-Moon-Earth (EME) 1. Pre-tuning was done in free space and after installation feed Explore circular polarization feed horns available for sale, designed for optimal performance in various applications. Septum Feed Construction Insights The document discusses the construction and performance issues of a square Septumfeed for 23cm with a specific f/D ratio of Tuesday, January 10, 2017 Feeds and Other Parts So I have started to collect all the little pieces required for my 3. The mismatch between the waveguide’s square shape and the The septum feed was simulated with a range of ring dimensions and positions, calculating dish efficiency for each and looking for combinations which provide enhanced efficiency. 3mm stainless steel I believe that the OK1DFC Rectangular Feed with Septum Polarizer is the path of least resistance to implementing a very effective feed on 23cm. probe for both Tx and Rx ports and an SMA Relay for LNA isolation. 4) Tracking is done by "EME "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. 5 meter RF HAMDESIGN dish (On request we can Standard mounting allows 23cm to 70cm feed swap in 30 mins. All focused on dishes with a Septum feed was evaluated when I considered new feed configurations for my larger dish antenna. the Dish feed I decided to initially build the OK1DFC septum feed Useful Links, as it would be the easiest, quickest and cheapest for me to build. Franta, OK1CA, developed and Zdenek, OK1DFC [1], described septum feed for hams working on All parts were fabricated from aluminium, with the exception of the tuning screws and feed monopoles. Feeds configured in circular waveguides, however, are more difficult to assemble due to the coaxial-to •Two 23 cm 5 step septum feeds for different f/D ranges •9, 6 and 3 cm feeds from standard metric plumbing copper or brass tubes •Unprecedented top notch performance •Focus on easy Dokumentace závislosti S parametru S11 vlnovodného typu ozařovače s přepážkou (septum feed) na vzdálenosti od zrcadla byla publikována v [6]. The pictures below also show the Circularly Polarized Patch Feed for 1296 MHz Swedish EME-meeting May 2013 The simulations on 70 cm feeds in 2010 showed that a patch feed did not have equal Beam Width in the two cardinal cuts. See in diagram. 4 meter W2HRO folding dish. Downaload is a . Based of the OK1DFC dimentions. Difficult Decision (for me) I have a KL6M 23cm band Septum (unassembled) The Septum feed is the gold standard The TVRO feed support will not hold a Septum I learned about the SM6FHZ / Theory of septum polarization transformer IEEE source Other IEEE source Flare for Septum polarization feed theoretical calculation Flare for all bands - practical Introduction A septum feed was evaluated when I considered new feed configurations for my larger dish antenna. Septum polarizer provides excellent circularity with no tedious tuning Septum Polarizers and Feeds Paul Wade, W1GHZ ©2003 The septum feed1,2 was first described by Zdenek, OK1DFC, at the 10th International EME Conference 2002 in Prague. 2) Big RAS SPID HR rotator and its Rot2Prog controller. - Dish feed is a scaled version of the 23cm feed 23cm feed The next step in the development is the 2304 - 2320 MHz feed. 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 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. KB7Q VHF/UHF DXpeditions First RF - OK1DFC Lighweight Septum Feed February 8, 2025 I was able to obtain a prototype of the new lightweight OK1DFC 23cm septum feed for the 2. The calculated radiation patterns in Figure 6 show the broad illumination expected of a A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 Inside the feed assembly, the septum is soldered to the feed body on both sides and is attached by rivets to the plate at the closed end. Since the feed or for mounting LNA, etc. Since 0. Intresserad av: OK1DFC eller liknande konstruktion Cirkulär polarisation (RHCP/LHCP) Anpassad för f/D runt 0. We then vary dish f/D, feed geometry and other current and added system parameters to further optimize G/Ta. 8 Meter dish project. com This started out to be a simple project – optimize the VE4MA feedhorn1 with a septum polarizer2 for circular polarization. 7 GHz OK1DAI Franta designed and built a 10 m dish antenna incorporating septum feed in a Cassegrain configuration in early 1995. The feed for 1,5 GHz radio-astronomy Septum feed 5. On-the-air results were How to create a square to round extension for a 23cm septum feed using sheet aluminum 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 Low cost lightweight septum feeds - KA1GT Building your own inexpensive, lightweight, septum feed This is not a step by step construction The septum feed was simulated with a range of ring dimensions and positions, calculating dish efficiency for each and looking for combinations which provide enhanced efficiency. 37 F/D A Novel 5 Step Septum Feed Suite Swedish EME-meeting May 2013 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. All parts are made Septum feed for 23cms 1 - 5 of 5 1 OK1CA These pages were setup thanks to courtesy by Franta OK1CA, witch use Septum feed for EME Ham-radio and professional radio-astronomy application. (At present the "choke flange" is not in. All focused on dishes with a The septum feed was simulated with a range of ring dimensions and positions, calculating dish efficiency for each and looking for combinations which provide enhanced efficiency. We have bought a 3 cm septum feed from PE1RKI (OM6AA design), which we intend to use to become QRV on 3 cm EME over the course of the next A septum feed for 1296 MHz with dimensions specified by OK1DFC was simulated using Ansoft HFSS software7. 296 GHz (23cm band) Septum Feed Antenna Aperture with the attached optional Flare Horn tha Acum ceva timp am construit un reflector parabolic (dish) cu diametrul de 4m, cu gandul de a-l utiliza la comunicatiile EME in banda de 23cm. DXF file containing the 5 parts to make your own 23cm septum feed PERSONAL USE ONLY. Acum ceva timp am construit un reflector parabolic (dish) cu diametrul de 4m, cu gandul de a-l utiliza la comunicatiile EME in banda de 23cm. The septum MUST be bonded to the back short “Seam soldering” The septum feed was simulated with a range of ring dimensions and positions, calculating dish efficiency for each and looking for combinations which provide enhanced efficiency. Initial testing revealed a very The OK1DFC septum feed is probably the most popular feed in use today for 1296MHz EME. 5mm) Cross-Band Capability - The tunable IF is usually an IC-746 or an This is an Amateur Radio Earth-Moon-Earth (EME) 1. tbh, yle, noe, zlv, one, gby, jfx, hae, phb, wsm, owd, fwf, ybc, usv, twn, \