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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 
> >> _______________________________________________ 
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