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

[Daniel Holmes]

Yep, it works the same way. Not sure about the FT-818, but I have no reason to believe it won’t behave the same as well.

Dan
--
Daniel Holmes, danielh at holmesonics.com
"Laugh while you can, monkey boy!" -- Lord John Whorfin


> On Nov 1, 2018, at 9:47 AM, w0km at cox.net wrote:
> 
> I'm curious, does the ft-817 behave the same way??
> 
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> On Thu, Nov 1, 2018 at 10:15 AM -0400, "Mark L. Hammond" <marklhammond at gmail.com> wrote:
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> Hasan, is this a possible solution?
> 
> https://www.arrl.org/shop/files/pdfs/Satellite%2520Kit.pdf
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> 
> 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
> 
> 
> 
> 
> 
> _______________________________________________
> 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