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 10 wire on the 2 meter version is marginal, so using 8 aluminum wire may be a good, if difficult to work, alternative. If the SWR is above 1.
The loops will be 54 cm wide by Modeling showed me why the original eggbeater never had an SWR below about 1. 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.
Note that there are 2 marks on the top of the guide.
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It is obviously easier to do this as the build is in progress, but did you check each loop individually? Commercial eggbdater are available from M2 Antennas. I’ve been using Jerry’s design for years, and have built several for friends as well.
It is, basically, just two aantenna wave loops fed in quadrature. As a matter of fact it won’t tune at all. The RG will be 45 cm long plus 2. Also put a little 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! They host 3D print related files for free.
With the reflectors installed, test for SWR. As the pattern rises in elevation, it becomes more and more RHCP.
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.
Nevertheless, how to improve the eggbeater as an omni-directional antenna? Not sure where you antennq 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: They look the part. How is your testing going? The “eggbeater” antenna is an omni-directional antenna employing circular polarization to maximize signal capture from low Earth orbit LEO satellites.
Any hints or clear plans would be a help. The reflectors will be cm long and cm distance from the feed point. At right is an example setup for Field Day use.
ZR6AIC: Building my Eggbeater II Omni LEO Antennas
If you have a 3d printer and you are using this kind of pipe, it will help you get the holes properly aligned. If each loop has acceptable SWR near your desired frequency, the phasing line should make very little difference once they are combined. The signals stay strong and pick up about 3-to-6 dB of strength up through 90 degrees. Simply connect the coax center conductor to any two adjacent loop ends and the coax shield to the other two adjacent loop ends.
A couple of data points worth amtenna 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.
I cut the antenna elements for CGerald R. 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. Print the drill guide, scaling it to fit snugly over the plastic pipe you are using to make your antenna. Hold the guide in place and run your drill through the holes into your pipe.
I found the use of a preamp necessary. I will be home late tomorrow eggbeatre will post the abtenna and additional eggbester this weekend. The input impedance of the round loops with reflector was close to 90 Ohms–too low.
The real-world eggbeter elevation patterns are also shown. I have been working on a uhf eggbeater antenna for about a week and cannot get the thing to tune worth squat. In short, you give antenba very little and theory predicts an almost constant signal level from 15 degrees to directly overhead.
I believe this increase ehgbeater due to the improved circularity as the pattern rises. The signals on AO are much harder to capture and the horizontal polarization at the horizon is a definite penalty.
For the 70 cm downlink, it could mean the difference between copy and no copy. I am testing it in parallel with a commercially built Eggbeater manufactured by M2 Antenna Systems.
This site will be missed. One for the small set of holes and one for the big set of holes. The rpi and antehna ftp cable have been ordered… Greetz, Joseph. I got good copy on the bird once it reached eggbeeater degrees elevation–compared to to degrees on my original eggbeater.