[amsat-bb] FM vs Linear Transponders

[Paul Stoetzer]

It does not have full-duplex. If it did, it’d be the radio I was looking
for!

73,

Paul, N8HM

On Friday, May 8, 2020, Cal Spreitzer via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> For those wanting to get on the linear birds and work portable I think the
> new Icom-705 might fit the bill.   It will do both 144/430 MHZ full duplex
> QRP and give a spectrum display as well.  Very similar to IC-9700 with a
> satellite mode.  It looks promising. Far from the days of dual 817's.
>
> Cal / N3CAL
>
>
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Ray
> Soifer via AMSAT-BB
> Sent: Friday, May 08, 2020 11:40 AM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] FM vs Linear Transponders
>
> Being neither a grid-chaser nor a ragchewer, I hesitate to get involved in
> this debate, but my flak jacket is on so here goes.
>
> There is a fundamental difference between FM satellites and linear
> transponders: every LEO FM satellite that has been put up so far has only
> one channel, while linear transponders can accommodate several QSOs at the
> same time.  Thus, for those of us operating from densely populated areas,
> using an FM satellite to talk with friends seems a misuse of available
> resources.  It also creates an incentive to run excessive power in order to
> keep others from taking over the channel.  A linear transponder is much
> better suited to that type of operation.  Rapid-fire grid-chasing,
> state-chasing or DX chasing, on the other hand, can easily make 3 or 4 QSOs
> per minute, a more efficient use of a single-channel transponder.
>
> That's my input.  Now I'll go back to CW.
>
> 73 Ray W2RS
>
> _______________________________________________
> 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
>