[ICOM] 756 pro III noise

[Jim Hargrave]

Jim,

You stated in an earlier message that the TX light came on and back off.
It may not be related, but make sure your VOX is off and the anti-VOX set to
maximum.

This could also be an indication of possible very high SWR and the radio is
self protecting. Perhaps a bad connection or relay contact in the autotuner
circuit somewhere. There could be a problem in the SWR bridge that drives
the autotuner control circuits.

I'm not familiar with the mechanical arraignment of the auto tuner, but I
wonder if its possible to disconnect and bypass it physically.

     73's Jim
      W5IFP

> -----Original Message-----
> From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net]On Behalf Of Jaime Gomez
> Sent: Wednesday, October 13, 2010 1:36 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] 756 pro III noise
>
>
> Well, I did the reset, as per Walt's instructions. Same thing, no Tx,
> popping noise on all frequencies, not affected by the noise blanker, AGC,
> filters, etc....and now I noticed something else, when I turn the
> dial, the
> popping increases and depends of the dial turning speed....Obviously the
> auto tuner is not working because there is no rf to excite it....
>
> What can I look at, if there is anything?
>
> 73, Jim, HK1N
>
> On Wed, Oct 13, 2010 at 12:36 PM, Walt Heilsnis - WB2VSJ <
> wb2vsj at earthlink.net> wrote:
>
> > This is beginning to sound a little bit familiar - I vaguely remember
> > something somewhere about a transmit issue like this and I think it was
> > Auto-Tuner related.
> >
> > Anyway, according to the PRO III Manual the reset procedure is:
> >
> > - Make sure the transceiver power is OFF.
> > - While pushing [M-CL] and [(F-INP)ENT], push
> > [POWER] to turn power ON.
> > - The internal CPU is reset.
> > - A/D convertor calibration of the DSP unit starts and it
> > takes 10 sec.
> > - The transceiver displays its initial VFO frequencies when
> > resetting is complete.
> > - Correct the set mode settings after resetting, if desired.
> >
> > I have a PRO II and have not had any issues like this (yet) :)
> >
> > Walt
> >
> >
> > -----Original Message-----
> > >From: Jaime Gomez <cwdx.hk1n at gmail.com>
> > >Sent: Oct 13, 2010 1:07 PM
> > >To: ICOM Reflector <icom at mailman.qth.net>
> > >Subject: Re: [ICOM] 756 pro III noise
> > >
> > >Hi Walt, I have connected a dummy load to the antenna
> terminal, no change,
> > >noise is present in all bands, all modes, not affected by
> attenuators or
> > >preamps, all other radios in the station (7800, proII, proIII,
> 781) work
> > >fine. I just noticed also that it is not transmitting, the Tx red light
> > just
> > >blinks and turns off and no power output.
> > >
> > >How do I hard reset the rig to factory fresh as Rich sugested?
> > >
> > >Thanks, 73
> > >
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> >
>
>
>
> --
> Jim, HK1N
> ----
> 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/
> To support QSL/QTH.net: http://www.qsl.net/donate.html