[amsat-bb] AO-85 downlink

Alan wa4sca at gmail.com
Thu Nov 19 20:20:58 UTC 2015

Hi Pedro,

I have been looking at this, using some precision time and frequency equipment to measure the
downlink.  On today's pass at 1530 UTC it was running about 3 KHz below the nominal frequency, AOS to
LOS. The magnitude of the difference has been increasing along with the component operating
temperatures. It will be interesting to see whether that trend continues at elevated temperatures.
Looking forward to this afternoon's passes.



<-----Original Message-----
<From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Pedro Sousa via AMSAT-BB
<Sent: Thursday, November 19, 2015 1:24 PM
<To: amsat-bb at amsat.org
<Subject: [amsat-bb] AO-85 downlink
<I just had a 80 plus degrees pass by AO-85 and noticed that the downlink
<frequency was, at the descent phase, off by 10kHz at 145.970.
<Despite correcting for Doppler I've never seen this kind of deviation
<before in such a overhead pass, where usually stands around 145.977.
<73 de Pedro CU2ZG
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