[amsat-bb] doppler shift

John john at amber.org.uk
Thu Jan 4 10:10:37 UTC 2018

Hi Dave,

When you say your doppler is too far ahead or behind, do you actually mean your overall frequency, or do you mean your split distance?

If you mean your overall frequency then that's really odd, as SatPC32 has always put me smack bang in the middle of the pass-band if using linears (with the correct locator set on login). If this isn't the case you can adjust it in the settings files, but it's generally calculated based on your locator and the Keplerian data you can download (and should be updating every time you open up the app). If, however, you mean your offset (ie finding your own downlink) then this is always a bit variable for me, but usually pretty close.

SatPC32 does, in my experience, remember your offsets when you adjust them (in my case either with the + and - buttons, or the pot at the top right of the rig), so that next time you hit that satellite it keeps the same offsets. You may find your offset is slightly different on different passes, or you may find it's exact every time, but that's part of the fun with linears - finding yourself first!

Hope that helps.

John (XLX)

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Dave L
Sent: 03 January 2018 23:32
To: amsat-bb at amsat.org
Subject: [amsat-bb] doppler shift

I'm useing satpc and a Yaesu ft-847.

Fm birds are not a problem. SSB  I'm either to far ahead or behind.

Any hints or advice would be appreciated.

radio and ant are comp controled




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