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

[Hasan al-Basri]

Thanks to all of you. Now I can stop chasing my tail and concentrate on
becoming skilled at manually changing my uplink VFO while PTT is asserted,
and drop PTT to let doppler recover.

..and N8MH, no that won't solve it. This is a hardware issue in the
FT-857D/817/818 series. I don't know if it applies to any others.

As it turns out, while a bit klunky, the 857d works very well. Participated
in a 5 way SSB qso on CAS-4A earlier today and had 5 consecutive SSB qsos
with VE3ECO on various birds, using the manual uplink adjustment, with snap
back after PTT release.

I am using the FT-857d with M2 Eggbeaters up only seven feet,  with a LOT
of vegetation loss on the uplink.

thanks for the info, 73, N0AN
Hasan


On Thu, Nov 1, 2018 at 12:44 PM Daniel Holmes <danielh at holmesonics.com>
wrote:

> 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??
> >
> >
> >
> >
> > 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
> >> _______________________________________________
> >> 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.
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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
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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!
> > 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
>