Re: Suggestions for Mode L antenna
Hello Currently the way I have been doing L band is as follows. IC1271A (1.2ghz xcvr) 10 watts, KJ6KO 60 watt amp to a M squared 23cm22E2 yagi at 50 feet, through 50 feet of LMR400. The yagi is at 50 feet for terrestial L band. When we get our next HEO (praying) I will most probably put the 22 el on the satellite array at 15 feet with the az/el rotor. I have been able to work through AO-51 with the current set up. The power is enough so some RF gets squirted up. I am considering a helix for 1.2 for satellites, or even my four foot dish. So many choices <grin>. Does anyone know what the expected ERP on L band should be?? 73 Bob W7LRD Seattle
-- "if this were easy, everyone would be doing it"
-------------- Original message -------------- From: Ronald Nutter rnutter@networkref.com
Greg:
Thanks for your option. My antenna building abilities havent been the best, so I am looking at commercially made antennas.
What type of coax/feedline should I use ? I will probably have the run under 50 ft. I would hope I dont have to use hardline as that will probably be very expensive with the price of copper. As I get close to the antenna, should I shift over to a different type of coax/feedline so that I can rotate the antenna to track AO-51 ?
Ron KA4KYI
Greg D. wrote:
Hi Ron,
I've done ok on AO-51 with a homemade helix. See
http://home.wavecable.com/~ko6th at the bottom of the page. I also have watts in the shack, but a full az/el rotor system. I don't know how sharp the pattern is for the helix, so I don't know how effective a fixed elevation system will be. But from the reports I've received, the 10 watts and my 60' of hardline with about 7 feet of RG-214 at each end seems to be quite adequate.
Good luck,
Greg KO6TH
Date: Sun, 11 May 2008 20:49:23 -0500 From: rnutter@networkref.com To: amsat-bb@amsat.org Subject: [amsat-bb] Suggestions for Mode L antenna
I am considering purchasing the 1.2 ghz module for my IC-910H. For my satellite work, I have my antennas angled at about 20 degrees since I dont have an az/el rotor. This setup worked reasonably well with Mode S this weekend. What are my chances to be able to work Mode L with this kind of setup ? Also, I would appreciate any suggestions for an antenna that I could use. With only 10 watts, I am not expecting a great signal but I would hope to have at least a readable signal. Also, would appreciate any suggestions as to coax/feedline that I should look at buying ?
Thanks,
Ron KA4KYI _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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