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Re: AO-51 Mode L uplink LHCP or RHCP?



Hi folks,

Well, the new antenna isn't built yet, but the satellite is in LU, and I 
still have the old antenna (9 element Quagi, crudely built from the ARRL 
Antenna Book) up on the rotisserie.

The 8:40pm pass went nearly over head, and I could hear my return clearly 
when the bird was above about 20 degrees.  This is with 10w in the shack, 
which is 60' of 1/2" hardline plus 10' of RG8 away from the above mentioned 
Quagi.  Tuning was fairly easy - I have computer control for the downlink 
rig, and I just tuned the uplink for clarity.  Seems that I had to tune 
about 5khz high for best results.  There was some QSB evident, but not too 
bad.  The Quagi is, of course, a linear antenna, and is mounted horizontally 
polarized, and my downlink UHF antenna is 2x8 RHCP with a small preamp at 
the feed point.

The only problem I ran into was that the only QSO I had was with myself.  
Nobody else on!

Greg  KO6TH

----Original Message Follows----
From: "Greg D." <ko6th_greg@hotmail.com>
To: amsat-bb@amsat.org
Subject: [amsat-bb] Re: AO-51 Mode L uplink LHCP or RHCP?
Date: Sat, 16 Jun 2007 19:28:14 -0700

Linear will do too.  I've got it right-handed, as it turns out, so it looks
like I'm all set.  Thanks!

Greg  KO6TH


----Original Message Follows----
From: "wa6fwf" <wa6fwf@sbcglobal.net>
To: "Greg D." <ko6th_greg@hotmail.com>
Subject: Re: [amsat-bb]  AO-51 Mode L uplink LHCP or RHCP?
Date: Sat, 16 Jun 2007 18:16:14 -0700

L is linear so it doesn't matter

U on the other hand

TX A (usually digital)LHCP TX B (usually analog) RHCP

73 Kevin wa6fwf



----- Original Message ----- From: "Greg D." <ko6th_greg@hotmail.com>
To: <amsat-bb@amsat.org>
Sent: Saturday, June 16, 2007 4:46 PM
Subject: [amsat-bb] AO-51 Mode L uplink LHCP or RHCP?


 >Hi folks,
 >
 >Ok, in a little panic here...  Building a helix to get a bit more gain on
 >the AO-51 mode L uplink, and I just realized that I don't know if it 
should
 >be Left or Right-hand polarized.  Which way should it go?
 >
 >Thanks,
 >
 >Greg  KO6TH
 >
 >_________________________________________________________________
 >Don't miss your chance to WIN $10,000 and other great prizes from 
Microsoft
 >Office Live http://clk.atdmt.com/MRT/go/aub0540003042mrt/direct/01/
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 >


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