[Icom] Article on improving IC-765 AGC/Audio

Wed, 03 Apr 2002 09:47:46 -0700

Hi,
This particular mod has an improvement by measurement done on the
article and ears tell the difference. I am 99% CW so, my values
are for that. That audio coupler cap made difference how the audio
sounds. Just locate the components from the board, replace or add
another in parallel. Difficult one was PIN diode mod. 
73,
Tony, VE6CGX

[email protected] wrote:
> 
> Tony,
> 
> Was this mod worth while? Did you notice any improvement?
> My 765 has a serial number of >4000 so it's a later edition. Some of the mods have
> been incorporated in the later models.
> Regards,
> John
> K1JEB
> 
> > -----Original Message-----
> > From: Tony Hwang [SMTP:[email protected]]
> > Sent: Wednesday, April 03, 2002 10:37 AM
> > To:   [email protected]
> > Subject:      Re: [Icom] Article on improving IC-765 AGC/Audio
> >
> > Hi, Bob
> > That is very simple mod. Changing some RC timing constant on AGC and
> > one cap. change(the audio coupling cap, in the audio amp section).
> > I found out the values does not have to be exact.
> > In my case, I changed the value of R440 to 470 Ohm, C280 to 0.66 mF,
> > C300 to 1.39 mF. Also if your R85 is 10K Ohm, change it to 4.3 K Ohm to
> > increase the sidetone level.
> > That's it.
> > 73,
> > Tony, VE6CGX
> > P.S. My old 765 has all the mod. that I know of. In every day use.
> >
> >
> >
> >
> >
> > [email protected] wrote:
> > >
> > > In the Dec 1995 issue of QST there was a Technical Correspondence article
> > > titled, "Modifying the ICOM IC-765 for Better-Sounding Audio and Smoother AGC
> > > Performances".
> > >
> > > Anyone here have a copy of that they can share with me?
> > > Tnx!!
> > >
> > > 73,
> > >
> > > Bob K8IA
> > > Michigan USA
> > >
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