[amsat-bb] AO-73 Frequency Shifts

[Albert Ozias]

Thank you for the explanation.  I do enjoy the bird but it is a challenge which seems to limits the number of operators using it.

________________________________
From: Graham Shirville <graham at shirville.com>
Sent: Thursday, July 30, 2020 11:58 AM
To: Albert Ozias <alozias at live.com>; amsat-bb at amsat.org <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] AO-73 Frequency Shifts

Hi Albert,

Not really a design flaw but more a design feature.

Basically, the designers were being shouted at to "keep the power
consumption to a minimum" by the power budget supremo...when the
oscillator circuits were designed, way back, low power equated to poor
thermal drift performance...now we have better technology but back then
it was a reasonable trade off.

Coming up next month, AO73-FUNcube-1 will be back in full sunlight so
the onboard temperatures will stabilise again.

I hope you can still enjoy using the transponder!

73

Graham G3VZV for the FUNcube team.....

On 30/07/2020 17:17, Albert Ozias via AMSAT-BB wrote:
> Why is AO-73 frequency more effected by time in sunlight than other birds? Is this a design flaw or a component failure?
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