[amsat-bb] Re: AO-51 L band frq

[Alan P. Biddle]

Luc,

Glad the rig is back up.  My experience, and that of some of the command
stations, is that the mode-L uplink is actually +3 KHz up from the nominal
value.  That seems consistent whether you are on voice or digital.  Of
course the exact frequency you use will depend on the calibration of your
rig, transverter LO, etc.  Using a precision counter, I found that my rig
was where it should be, but the transverter LO was off by about 10 KHz.  Of
course, you can fix that in HRD or SATPC32.

73s,

Alan
WA4SCA

 

-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Luc Leblanc
Sent: Friday, March 26, 2010 6:24 AM
To: amsat-bb at amsat.org
Subject: [amsat-bb] AO-51 L band frq

I was able to find some time yesterday to repair my L band DEM linear always
the same issues with the N type connector solder tab on the 
board who break if the coax is putting some stress on the center pin. I
heard someone on AO-51 this morning just at the end of the pass (i 
don't get his call sign) who told me the L band uplink was 5 to 6 KC up the
listed frequency? It could explain why i always have to tuned 
higher than my PC corrected doppler uplink frequency on L band.

Aside of this signals where great aside of the constant background noise
probably some kind of radar as reported in the past. At the first 
over the Atlantic pass the noise was not there it starts when AO-51 was
approaching the continent.
"-"


Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE

 
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