[amsat-bb] AO-73 Frequency Shifts

[Peter Goodhall (2M0SQL)]

Shouldn't be too much challenge, just use it manually without PC
control and its straightforward.

AO-73 is much for fun when twiddling both the vfos by hand.

Peter, 2M0SQL

On Thu, 30 Jul 2020 at 20:13, Albert Ozias via AMSAT-BB
<amsat-bb at amsat.org> wrote:
>
> 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?
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> > to all interested persons worldwide without requiring membership. Opinions expressed
> > are solely those of the author, and do not reflect the official views of AMSAT-NA.
> > Not an AMSAT-NA member? Join now to support the amateur satellite program!
> > Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb