[sarex] Re: Doppler correction

David Barber david.barber at dbelectronics.co.uk
Mon Dec 22 06:10:47 PST 2008

Correct - Tx low (below the nominal uplink freq) as the bird approaches,
high as the bird moves away from you.

The reverse for Rx.

I always think of the compressed / expanded spring analogy.


-----Original Message-----
From: sarex-bounces at AMSAT.Org [mailto:sarex-bounces at AMSAT.Org] On Behalf Of
andy thomas
Sent: 22 December 2008 12:57
To: sarex at AMSAT.Org
Subject: [sarex] Re: Doppler correction

I thought that you should tx low, not high, at the beginning of the pass,
and high, not low, towards LOS?

I'm not on 1.2 yet but I'm sure that when I hear on 2 and 70cms the bird is
high at AOS, and although I'm not sure it's necessary, the auto corrector in
HRD txs low at AOS.

andy G0SFJ


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