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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I am testing it in parallel with a commercially built Eggbeater manufactured by M2 Antenna Systems. Modeling showed me why the original eggbeater never had an SWR below about 1. Create egbgeater account Request new password.
Antenha used the plans posted by k50e and am at a loss as to what is causing it. At 5 degrees above the horizon, signals on FO start to come alive. I find these to be very broadbanded and forgiving if your dimensions are even close. Also put a little part of the used plastics inside a microwave oven and if the plastics feel warm than you egggbeater not use it for the parts which have to be electrical isolated! At right is an example setup for Field Day use.
Good luck with the rest of it. These dimensions are very precise and will work well with 10 and 12 wire for 70 cm onlybut you may want to make the loops slightly larger and trim the extra length based on your SWR readings. This placement helps “pull” the major lobes down to the horizon instead of “pushing” them overhead as in the original eggbeater design. The loops will be 54 cm wide eggbeateg I have some pics I took last time I made these, but I’ll anttenna to eggbezter that link later after I find them.
If you sended an e-mail than your question should appear after an admin has allowed: The signals stay strong and pick up about 3-to-6 dB of strength up through 90 degrees. 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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As phasing line between the two antenna loops I used 2 pieces of RG58 paralel. Hi Bob, I did sntenna testing with a rtl-sdr.
As it happens I have a bunch of it I picked up 30 years ago that I have been salvaging the braded copper shield from for grounding straps. The “eggbeater” antenna is an omni-directional antenna employing circular polarization to maximize signal capture from low Earth orbit LEO satellites.
The TPM improved the coaxial gain of the eggbeater by re-shaping the loop into a square and moving the reflector closer to the driven element. With the reflectors installed, test for SWR.
Cut the RG about 2″ 5 cm longer than these measurements and leave 1″ 2. Hello Joseph, Your antennas gook great! I’ve been using Jerry’s design for years, and have built several for egfbeater as well.
I cut the antenna elements for If there is any interest, I can probably write up a construction article and provide the STL file for my drill guide.
Eggbeater Antenna Tested In Our Anechoic Chamber ( MHz) – Hardware – Libre Space Community
If you have a 3d printer and you are using this kind of pipe, it will help you get antenns holes properly aligned. If you use the “original” eggbeater as the starting point, it is easy to describe this improved design, dubbed Eggbeater IIin terms of differences and deviations. For the 70 cm downlink, it could mean the difference between copy and no copy.
Nevertheless, how to improve the eggbeater as an omni-directional antenna? 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. Not very often; and the duration of it’s stay in that high elevation is very brief. The signals on AO are much harder to capture and the horizontal polarization at the horizon is a eeggbeater penalty.
The distance is not so critical and can be adjusted a small amount to get the SWR perfect.
Jerry’s notes suggest first checking eggbeater SWR with the two loops in parallel, without the phasing line. Any hints or clear plans would be a help. The ring lungs at one end of the phasing line can be shared with the 50 Ohm feedline F or equal recommended so that only four ring lungs are required.
Instead, rectangles are formed.
Common 1″ PVC couplings and stainless hardware are used. Note that there are 2 marks on the top of the guide. I would be interested in learning more about this approach. The first distinction is it does not use a round “loop” for the driven elements.
The reflectors will be cm long and cm distance from the feed point. And after that if you still do not have found the problem than post an e-mail message to amsat at amsat-bb. I have heard the cable on automobile stereo antennas is RG, so you might want to try your local parts dealer egfbeater WalMart to see if a cheap replacement antenna-with-coax is an easy source.
The real-world ground-based elevation patterns are also shown. They look the part. Drilling nice square and correctly aligned holes through a round plastic pipe can be a pain so I designed and printed a simple plastic drilling guide to make this easy.
Yet also noticed that a anfenna very strong stations on The idea of using 2 RG58 cable segments in parallel for the phasing line is new to me.