June 16, 2020

Building my Eggbeater II Omni low Earth orbit satellite Antennas for 70cm I only had vertical 5/8 ground plane antenna fro 70cm and 2m band. M2 Antennas Eggbeater Satellite Antennas offers exciting new performance characteristics for both fixed and mobile operations and will let you. Constructing an egg beater antenna for working satellites is reasonably straight forward. George Wilenski’s (ON6WG / F5VIF) documentation.

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Common 1″ PVC couplings and stainless hardware are used.

[amsat-bb] Homebrew Up-Dated Eggbeater Antenna

The input impedance of the round loops with reflector was close to 90 Ohms–too low. Remember that 6 dB is gained in reduction of the satellite’s path loss and 3 dB is gained in the improved circularity of the signal as the bird reaches higher elevations. Note the gain is almost the same at 45 degrees, but the new design is 6 dB better at 30 degrees and about 10 dB better at 15 degrees. I’ve been using Jerry’s design for years, and have built several for friends as well. Starting with a square and “playing” with the shape allowed me to find a very good match at Ohms, purely resistive.

At 15 degrees, they are strong and clear–without a preamp AND with over 50′ of feedline. Print the drill guide, scaling it to fit snugly over the plastic pipe you are using to make your antenna.

It also uses, optionally, a pair fggbeater parasitic reflector elements to focus more of the radiation pattern overhead.


I find these to be very broadbanded and forgiving if your dimensions are even close. It will do nothing.

At right is an example setup for Field Day use. While I have not attempted to use this antenna for pacsats, I have monitored the signals on FO while in mode JD and found I could copy at S3 or better from horizon to horizon with preamp.

If each loop has acceptable SWR near your desired frequency, the phasing line should make very little difference once they are combined. Slip the guide on your pipe and align the line on the top of the guide with the mark on your pipe.

I found the use of a preamp necessary. Modeling showed me why the original eggbeater never had an SWR below about atenna. They host 3D print related files for free. The 10 wire on the 2 meter version is marginal, so using 8 aluminum wire may be a good, if difficult to work, alternative. Did you check your eggbeater antenna with an antenna analyzer? The drill guide is pretty simple.

Best 73 Gary let me know how you make out. I suggest a quick continuity test between the shield and center conductor of you coax and phasing lines before you start tearing your hair out. Since the two rectangle-loops are fed in-quadrature but out of phasethe resultant feedpoint is very close to 50 Ohms with no reactance.

With the reflectors installed, test for SWR. Even without a fancy analyzer you can do a fairly low power check at several frequencies across the band, and see where is the lowest SWR. To the horizon it is linear-horizontally polarized. Re check your dimensions, for the 70cm version, my loops are about 76 cm.


At 5 degrees above the horizon, signals on FO start to come alive. That is by design. Also at 70 cm the reception in FMN of some satelites was good.

The first distinction is it does not use a round “loop” for the driven elements. How often does a satellite go above 75 degrees?

[amsat-bb] Homebrew Up-Dated Eggbeater Antenna

I would be interested in learning more about this approach. Mark a straight line along the length of your pipe. I used the plans posted by k50e and am at a loss as to what is causing it. The phasing lines are made from RG 93 Ohm, see notes below coaxial cable. The antennas are now moved to their fixed location and everything has to be reconnected again. The rpi and the ftp cable have been ordered… Greetz, Joseph.

I did some testing with a rtl-sdr. Commercial versions are available from M2 Antennas. There are no plans, everything is done with pen and paper and the drilholes are just measured and pointed on a PVC tube.

The signals stay strong and pick up about 3-to-6 dB of strength up through 90 degrees.

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