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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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In short, you give up very little and theory predicts an almost constant signal level from 15 degrees to directly overhead. With the reflectors installed, test for SWR. The “eggbeater” antenna is an omni-directional antenna employing circular polarization to maximize signal capture from low Earth orbit LEO satellites. I would be interested in learning more about this approach. To the horizon it is linear-horizontally polarized.

To use it, 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.

Print the drill guide, scaling it to fit snugly over the plastic pipe you are using to make your antenna. Instead, rectangles are formed. I cut the antenna elements for It is, basically, just two full wave loops fed in quadrature. Not sure where you found the plans, as his original AOL site went away – however I had previously grabbed the pages and Jerry has authorized me to publish them on my server, so here is that link for future reference: It is obviously easier to do this as the build is in progress, but did you check each loop individually?

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Hold the guide in place and run your drill through the holes into your pipe. At right is an example setup for Field Day use. 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.

I’ve been using Jerry’s design for years, and have built several for friends as well. They are lightweight and can be carried out to the FD position, one in each hand.

The reflectors will be cm long and cm distance from the feed point. The free space elevation plots NEC4Win clearly depict the improvement of the new design over the “original” eggbeater. Last week i also made a few eggbeaters one for MHz and one for MHz. How is your testing going?

Hi supercazzola, There are no plans, everything is done with pen and paper and the drilholes are just measured and pointed on a PVC tube. It also uses, optionally, a pair of parasitic reflector elements to focus more of the radiation pattern overhead.

[amsat-bb] Homebrew Up-Dated Eggbeater Antenna

As the pattern rises in elevation, it becomes more and more RHCP. Let us know how you make out direct email is OK too. This site will be missed. I have these antennae built and stored in the garage. The RG antenba be 45 cm long plus 2. 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. At 15 degrees, they are strong and clear–without a preamp AND with over 50′ of feedline. I will be home late tomorrow and will post the file and additional details this weekend.

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The antennas are now moved to their fixed location and everything has to be reconnected again.

I am currently unable to supply any more surplus cable, but you could contact Dino, K6RIX, to antdnna if he can provide you with a small amount. Navigation Top rated contacts Top anrenna images. Slip the guide on your pipe and align the line on the top of the guide with the mark on your pipe. This placement helps “pull” the major lobes down to the horizon instead of “pushing” them overhead as in the original eggbeater design. 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.

But ko2f said he made an STL for a drill template. eggbwater

As phasing line between the two antenna loops I used 2 pieces of RG58 paralel. How often does a satellite go above 75 degrees?

[amsat-bb] Homebrew Up-Dated Eggbeater Antenna

Best 73 Gary let me know how you make out. The garden-variety home-brew version employs a degree “phasing” line to provide a fixed right-hand circular polarization RHCP. One for the small set of holes and one for the big set of holes. Login or register to post comments. Any hints or clear plans would be a help.

See the phasing line sketch view from bottom for right-hand-circular-polarization connections. I used the plans posted by k50e and am at a loss as to what is causing it.