[ICOM] Older Icoms question

[John Geiger]

Thanks for the additional information. There is an audio out on the acc
connector on the back of the rig, but not sure how easy it would be to find
the 24 pin plug.

73 John AF5CC

On Tue, Sep 20, 2016 at 2:02 PM, Ken Winterling <wa2lbi at gmail.com> wrote:

> John,
>
> I never owned a 720 or 720A, I just repaired them and only used them long
> enough to verify my repairs with a few QSOs.  Once you get the rig take a
> look inside, it might be possible to run AF to the mic connector without
> too much trouble.
>
> A quick look at the schematic seems to indicate that there is a fixed audio
> level on the main board at P2/J10 pin 8 or at the junction of R127, 1K, and
> R128, 10K.  This is the input to the audio amp section, prior to the AF
> gain control.  I don't see a signal level indication so I don't know if it
> would be high enough for your purposes.  A scope or AC millivolt meter will
> give you a clue.
>
> Good luck!
>
>
> On Tuesday, September 20, 2016, John Geiger <af5cc2 at gmail.com> wrote:
>
> > Hi Ken,
> >
> > Thanks for the fast answer.  Guess there is no AF out there.  Do you
> still
> > like the 720A?
> >
> > 73 John AF5CC
> >
> > On Tue, Sep 20, 2016 at 12:46 PM, Ken Winterling <wa2lbi at gmail.com>
> wrote:
> >
> > > John,
> > >
> > > According to my IC-720A service manual, there isn't any connection to
> > pin 8
> > > of the mic connector.
> > >
> > > Ken
> > > WA2LBI
> > >
> > >
> > > On Tue, Sep 20, 2016 at 1:33 PM, John Geiger <af5cc2 at gmail.com> wrote:
> > >
> > > > On the 1990 and later Icom models the AF output is also found on the
> > mic
> > > > connector, on 8 pin, which is nice for building a simple digital
> modes
> > > > interface.  Is this also true on the older Icoms like the
> 720/730/740?
> > > The
> > > > manual never mentions it, but the wiring for the other pins is the
> > > same.  I
> > > > have an Icom 720A on the way and want to start working on an
> interface
> > > for
> > > > it.
> > > >
> > > > 73 John AF5CC
> > > > ----
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> >
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
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>