[amsat-bb] Re: no go 1.2 on AO-51

Greg D. ko6th_greg at hotmail.com
Fri Jun 22 00:22:20 PDT 2007

Hi Bob,

Wow, that should work.  I've got the same rig, 60' of hardline and about 7' 
of RG-8 at each end.  The antenna is a 9-element Quagi from the ARRL Antenna 
Handbook, polarized horizontally.

The start of a pass is around 1268.670, climbing up to 1268.730 at the end 
of the pass.  I generally don't get into the bird until it's around 20 
degrees up, partly due to trees.  The downlink side I have a 2x8 element 
Yagi with a preamp, and find that polarization changes during the pass, 
seemingly at random.  I generally follow doppler by keying up and tuning 
around to find the edges where I get fuzzy, then center it.  It just takes a 
second or two.  I also find that my computer prediction is about 5khz low 
(so tune 5 khz higher than it says), but otherwise pretty accurate.  Others 
have similar offsets in the 2-5 khz range.  You don't seem to need the 67 hz 
tone (and it sounds a lot better without it!).  My rotors and receive rig 
(Yaesu 736R) are computer controlled; I have to run the transmit side by 

Keep trying!

Greg  KO6TH

----Original Message Follows----
From: w7lrd at comcast.net
To: amsat-bb at amsat.org
Subject: [amsat-bb]  no go 1.2 on AO-51
Date: Thu, 21 Jun 2007 18:24:28 +0000

I'm not sure if I have some "operator trouble" or equipment snafus.  Running 
an IC1271A 10 watts to a homebrew 40 T helix via 45 feet of 1/2 hardline.  
With a questionable connector. Eight feet of LMR400 to the antenna.  I can 
hear some you you guys, but my up link is a no go.  I'm transmitting on 
1268.700 +/- 20.  Considering doppler what is your uplink freq?  I also 
might have some questionable construction methods with my antenna.  I 
suppose if this were easy everyone would be doing it!

73 Bob W7LRD
AMSAT member 28498
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