[amsat-bb] Re: Tranzit-B telemetry system on ISS

Gordon JC Pearce MM3YEQ gordonjcp at gjcp.net
Tue Mar 17 03:28:41 PDT 2009

On Mon, 2009-03-16 at 18:27 -0600, Nate Duehr wrote:
> How are the "American aircraft signals" which are all AM, being rebroadcast
> in any intelligible way by an FM receiver?

Uhm, perhaps because FM receivers can usually pick up AM pretty well, if
not perfectly?

It took me a while to realise that the slight distortion I was hearing
on the infamous Edinburgh 145.800MHz (yes, they trample on the ISS
downlink) net was because they were using AM, not FM.  It just sounded
very slightly off-tune, but no amount of tweaking would bring it in...


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