[amsat-bb] Re: Suggestions for Mode L antenna
w7lrd at comcast.net
Mon May 12 12:15:31 PDT 2008
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
"if this were easy, everyone would be doing it"
-------------- Original message --------------
From: Ronald Nutter <rnutter at networkref.com>
> 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 ?
> 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 at networkref.com
> >> To: amsat-bb at 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
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