[ICOM] 756 pro III noise

[Jim Hargrave]

Jim,

Have you actually shorted the antenna connection? Does it go away?
Is the noise on all bands or just 40M?
Does it stop if you reduce the receiver RF gain?
What happens if you turn off the AGC?

     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: Tuesday, October 12, 2010 8:08 PM
> To: ICOM Reflector
> Subject: Re: [ICOM] 756 pro III noise
>
>
> Thanks, Walt, the noise is present even without anything connected to the
> antenna input.
> 73,
>
> Jim, HK1N
>
>
> On Tue, Oct 12, 2010 at 7:06 PM, Walt - WB2VSJ
> <wb2vsj at earthlink.net> wrote:
>
> > What's it do with the rcvr  input terminated?  i.e. dummy load.
>  Only 40M?
> >
> > -----Original Message-----
> > From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net]
> > On
> > Behalf Of Jaime Gomez
> > Sent: Tuesday, October 12, 2010 7:26 PM
> > To: ICOM Reflector
> > Subject: [ICOM] 756 pro III noise
> >
> > This afternoon I was testing one of the new antennas for 40 mt, all of a
> > sudden I started hearing a very strong (s9 in the meter)
> pulsing noise, it
> > pulses at about 15 cycles per second, after a lot of checking I
> found that
> > the noise is produced in the radio, it is present without any external
> > connection to it and doesn't matter which power supply
> connected, I tested
> > 3
> > different power supplies, the noise is definitely in the radio.
> I connected
> > another one and no noise.
> > Anyone who has experienced something like this? Any hints about where to
> > check?
> >
> > Appreciate any help, because it will be quite difficult to
> re-export it for
> > repairing and CQWW is close.....
> >
> > --
> > Jim, HK1N
> > ----
> > Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users
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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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> >
>
>
>
> --
> 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