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
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.
David G8OQW
-----Original Message----- From: sarex-bounces@AMSAT.Org [mailto:sarex-bounces@AMSAT.Org] On Behalf Of andy thomas Sent: 22 December 2008 12:57 To: sarex@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
---- Sent via sarex@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/sarex
Sorry Guys, My mistake please reverse the +/- signs, apart from that I think my calculations are reasonably accurate.
Regards Tony. VK5ZAI
J.A.(Tony)Hutchison P.O.Box 470 Kingston SE South Australia 5275
National ARISS Co-ordinator and Satellite Earth Station.
Web Site :- http://www.electric-web.org Also click on :- http://www.google.com.au/search?hl=en&q=%22vk5zai%22&btnG=Google+Sea...
andy thomas wrote:
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
Sent via sarex@amsat.org. Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/sarex
participants (3)
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andy thomas -
David Barber -
Tony, VK5ZAI