EGGBEATER ANTENNA PDF

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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The phasing lines are made from RG 93 Ohm, see notes below coaxial cable. Print the drill guide, scaling it to fit snugly over the plastic pipe you are using to make your antenna. This implies an ideal omni-directional antenna would have an elevation pattern that was -6 dB from 30 degrees to 90 degrees–focusing the gain from the horizon up to 30 degrees elevation–where you need it the most–but without the deep overhead null presented by high-gain verticals.

Note that there are 2 marks on the top of the guide. What I did was design a 3d printable drill guide suitable for use with common in the US at any rate 1″ PVC plastic pipe. The RG will be 45 cm long plus 2.

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The signals on AO are much harder to capture and the horizontal polarization at the horizon is a definite penalty. Did you check your eggbeater antenna with an antenna analyzer? They host 3D print related files for free. At 5 degrees above the horizon, signals on FO start to come alive. Common 1″ PVC couplings and stainless hardware are used.

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Hold the guide in place and run your drill through the holes into your pipe. The “eggbeater” antenna is an omni-directional antenna employing circular polarization to maximize signal capture from egbeater Earth orbit LEO satellites. I find these to be very broadbanded and forgiving if your dimensions are even close. Nevertheless, how to improve the eggbeater as an omni-directional antenna? This effect makes it a “gain” antenna, but that gain is at the expense of low-elevation reception.

Here is the URL for your reference.

[amsat-bb] Homebrew Up-Dated Eggbeater Antenna

Unlike the original eggbeater, this new design provides an almost perfect 1. This placement helps “pull” the major lobes down to the horizon instead of “pushing” them overhead as in the original eggbeater design. I have been working on a uhf eggbeater antenna for about a week and cannot get the thing to tune worth squat. Not very often; and the duration of it’s stay in that high elevation is very brief.

The idea of using 2 RG58 cable segments in parallel for the phasing line is new to me. A couple of data points worth noting are, compared to directly overhead, a typical LEO satellite has about 6 dB in free-space path loss at 30 degrees, and another 6 dB at the horizon.

For the 2 meter uplink, you may never tell the difference. I did some testing with a rtl-sdr. With the reflectors installed, test for SWR. 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.

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Good luck with the rest of it. If you are using another metric perhaps pipe size, most 3d printers allow you to scale a sggbeater without too much difficulty. They look the part.

The antennas are now moved to their fixed location and everything has to be reconnected again. In short, you give up very little and theory predicts an almost constant signal level from 15 degrees to directly overhead.

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Egg Beater Antenna

I believe this increase is due to the improved circularity as the pattern rises. Tony presents a novel and effective design and makes several thought-provoking points. To the horizon it is linear-horizontally polarized.

I am testing it in parallel with a commercially built Eggbeater manufactured by M2 Antenna Systems. 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.

[amsat-bb] Homebrew Up-Dated Eggbeater Antenna

To use it, Print the drill guide, scaling it to fit snugly over the plastic pipe you egggbeater using to make your antenna. Also at 70 cm the reception in FMN of some satelites was good. Slip the guide on your pipe and align the line on the top of the guide with the mark on your pipe.