[amsat-bb] Yaesu FT-857D and Doppler

[w0km at cox.net]

I'm curious, does the ft-817 behave the same way??




On Thu, Nov 1, 2018 at 10:15 AM -0400, "Mark L. Hammond" <marklhammond at gmail.com> wrote:










Hasan, is this a possible solution?

https://www.arrl.org/shop/files/pdfs/Satellite%2520Kit.pdf


Mark N8MH


On Thu, Nov 1, 2018 at 9:09 AM John  wrote:

> Hasan,
>
> It's a "design feature". As you said, you've been told correctly. It
> doesn't
> accept CAT commands for changing frequency whilst in TX.
>
> 73,
> John (M5ET)
>
> -----Original Message-----
> From: AMSAT-BB  On Behalf Of Hasan al-Basri
> Sent: 01 November 2018 13:54
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Yaesu FT-857D and Doppler
>
> I have been told that this radio will not accept CAT doppler adjustments
> while it is transmitting. I definitely see that it doesn't, but don't know
> if I might be doing something wrong.
>
> Here is how it behaves:
>
> If not transmitting, doppler correction works perfectly. As I assert PTT,
> doppler adjustment stops and I slide up the band...pretty quickly on high
> passes. If I hold the ptt for more than a couple of seconds, I will go
> right
> out of the passband of my 2.2 kHz filter...and of course become
> unintelligible.
>
> As soon as I drop PTT, and key the mike again, I'm dead on freq...and as
> long as I hold the PTT on, I drift up the band. *It appears the the FT-857D
> will not accept CAT commands while PTT is asserted.*
>
> At this point I need to know that there is no real solution to this problem
> with this radio. If that's true, I can get pretty good at doing this:
>
> 1. Assert PTT and start talking.
>
> 2. Grab VFO knob, adjust as I talk to keep sounding good.
>
> 3. Drop PTT and begin to listen to other station. (at the drop of PTT,  tx
> freq snaps to "proper" place that it couldn't get to when PTT was asserted)
>
> 4. My turn to talk: Assert PTT and I'm dead on freq where I belong.
>
> Basically, I'm doing manual uplink adjustment to freq while I'm talking and
> letting the CAT adjustment for doppler to take place (to the uplink freq)
> while I'm listening.
>
> *If there is a better way to do this, please advise*.
>
> Note, it is not practical to drop PTT quickly enough and often enough to
> prevent the problem...I can only speak a couple syllables at best, before I
> slide away.
>
> Equipment and Setup:
>
> Rx: SDRPlay RSP2 Sofware Defined Radio with SDR Console v 3.03 providing
> Doppler to Rx
>
> Tx: Yaesu FT-857D controlled as External Radio by SDR Console v 3.03
> providing doppler correction to the External Radio.
>
> p.s.  I have tried other doppler control programs and they behave the same
> way.
>
> Any and all help would be most appreciated, even simply: You are stuck with
> the way you are currently doing it.
>
> 73, N0AN
>
>
>
>
>
> Hasan
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> _______________________________________________
> 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!
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-- 
Mark L. Hammond [N8MH]
_______________________________________________
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: http://www.amsat.org/mailman/listinfo/amsat-bb