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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Remember that 6 dB is gained in reduction of the satellite’s path loss wggbeater 3 dB is gained in the improved circularity of the signal as the bird reaches higher elevations. The 10 wire on the 2 meter version is marginal, so using 8 aluminum wire may be a good, if difficult to work, alternative.
Nevertheless, how to improve the eggbeater as an omni-directional antenna? If each loop has acceptable SWR near your desired frequency, the phasing line should make very little difference once they are combined.
Also put a antdnna part of the used plastics inside a microwave oven and if the plastics feel warm than you can not use it for the parts which have to be electrical isolated! I have heard the cable on automobile stereo antennas is RG, so you might want to try your local parts dealer or WalMart to see if a cheap replacement antenna-with-coax is an easy source.
Home made Eggbeater antenna – Hardware – Libre Space Community
Modeling showed me why the original eggbeater never had an SWR below about 1. The “eggbeater” antenna is an omni-directional antenna employing circular polarization to maximize signal capture from low Earth orbit LEO satellites.
This effect makes it a “gain” antenna, but that gain is at the expense of low-elevation reception. The second major distinction eggbexter the location of the reflector elements. They look the part.
For the 70 cm downlink, it could mean the difference between copy and no copy. To the horizon it is linear-horizontally polarized. Any hints or clear plans would be a help.
ZR6AIC: Building my Eggbeater II Omni LEO Antennas
Cut the RG about 2″ 5 cm longer than these measurements and leave 1″ 2. In case you do not own one, than ask amateurs to help who have one. The antenna is linearly polarized horizontally at the horizon and the pattern becomes more and more right-hand-circularly-polarized RHCP as the elevation pattern increases. The 10′ sections of pipe are stored separately and assembled onto the antennas out in the yard. I am testing it in parallel with a commercially built Eggbeater manufactured by M2 Antenna Systems.
I did some testing with a rtl-sdr. This placement helps “pull” the major lobes down to the horizon instead of “pushing” them overhead as in the original eggbeater design. I would be interested in learning more about this approach.
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It has been my workhorse LEO antenna ever since, but of course, it is a directional antenna. With the reflectors installed, test for SWR.
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.
To use it, Print the drill guide, scaling it to fit snugly over the plastic pipe you are using to make your antenna. The garden-variety home-brew version employs a degree “phasing” line to provide a fixed right-hand circular polarization RHCP. See the phasing line sketch view from bottom for right-hand-circular-polarization connections.
The RG will be 45 cm long plus 2. His prototype design, however, may be difficult for the average back yard mechanic a ham with two left thumbs to reproduce. 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. But ko2f said he made an STL for a drill template.
I find these to be very broadbanded and forgiving if your dimensions are even close. I used the plans posted by k50e and am at a loss as to what is causing it. 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.
Hold the guide in place and run your drill through the holes into your pipe. Construction was easy and took about half a day.
[amsat-bb] Homebrew Up-Dated Eggbeater Antenna
Eggbeater Check for a short in your coax and phasing lines, It can happen to the best of us. It will do nothing. Simply connect the coax center conductor to any two adjacent loop ends and the coax shield to the other two adjacent loop ends. I have been working on a uhf eggbeater antenna for about a week and cannot get the thing to tune worth squat. I’ve been using Jerry’s design for years, and have built several for friends as well.
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. There are no 3D prints in this construction.
Let us know how you make out direct email is OK too.
In short, you give up very little and theory predicts an almost constant signal level from 15 degrees to directly overhead. I believe this increase is due to the improved circularity as the pattern rises.
Not sure where you found the plans, as his original AOL site went away – however I had previously grabbed the eggbfater and Jerry has authorized me to publish them on my server, so here is that link for future reference: Create new account Request new password.
Good luck with the rest of it. Yet also noticed that a few very strong stations on 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. It is recommended reading.
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. 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.