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Re: AO-51 SSB/FM mode



----- Original Message ----- 
From: "Bruce Robertson" <broberts@mta.ca>
To: <amsat-bb@amsat.org>
Sent: Monday, January 16, 2006 7:07 AM
Subject: [amsat-bb] AO-51 SSB/FM mode


> I've just used a pass over the Atlantic to test out the SSB/FM mode on
> AO-51. I can confirm Stephan's observation that this is a relatively QRO
> mode: the same 5w which do just fine on FO-29 and on SO-50 and AO-51 in FM
> modes is apparently insufficient here. As a guess, I'd say I need about 3
> more dB because I can hear myself whistling but a speech signal is too far
> into the noise of the FM signal.
>
> This raises two questions:
>
> A) Does anyone know why this would be the case?
>

Because a whistle produces a much higher peak envelope power than speech 
does and, as Drew pointed out, the volume of your downlink in the SSB/FM 
depends, to a point, on the strength of your uplink.

73

George, KA3HSW
----
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