IC-765 Pin Diode Mod & PBT Mod ???

IC-765 Pin Diode Mod & PBT Mod ???

Post by DCA » Wed, 17 Apr 2002 08:13:02

I recently acquired a nice used Icom 765.  I have heard reference to a
mod that replaces the switching diodes with pin diodes to improve the
receiver performance.  Does anyone have any details on this mod?
Someone told me there was an Icom service bulletin on this update but
I cannot find any info on it.  I do have the service manual  though.

Also, there is a commonly posted mod that supposedly restores the
passband tuning (PBT) function like it was on the 761.  However, there
appears to be some discussion as to whether this actually restores
true passband tuning.  Has anyone done this little mod and if so, what
was your  experience with it?

Thanks Very Much !

Dave  KB8VJD


 
 
 

IC-765 Pin Diode Mod & PBT Mod ???

Post by Mark Hal » Wed, 17 Apr 2002 10:56:18


I have a '761..  wonder if that PIN diode mod works on the '761?

'73  KI4Z


> I recently acquired a nice used Icom 765.  I have heard reference to a
> mod that replaces the switching diodes with pin diodes to improve the
> receiver performance.  Does anyone have any details on this mod?
> Someone told me there was an Icom service bulletin on this update but
> I cannot find any info on it.  I do have the service manual  though.

> Also, there is a commonly posted mod that supposedly restores the
> passband tuning (PBT) function like it was on the 761.  However, there
> appears to be some discussion as to whether this actually restores
> true passband tuning.  Has anyone done this little mod and if so, what
> was your  experience with it?

> Thanks Very Much !

> Dave  KB8VJD



 
 
 

IC-765 Pin Diode Mod & PBT Mod ???

Post by M.E. » Wed, 17 Apr 2002 11:00:06

www.qsl.net/ab4oj
Has the answers you seek.

--
Respond to my "real" e-mail;


> I recently acquired a nice used Icom 765.  I have heard reference to a
> mod that replaces the switching diodes with pin diodes to improve the
> receiver performance.  Does anyone have any details on this mod?
> Someone told me there was an Icom service bulletin on this update but
> I cannot find any info on it.  I do have the service manual  though.

> Also, there is a commonly posted mod that supposedly restores the
> passband tuning (PBT) function like it was on the 761.  However, there
> appears to be some discussion as to whether this actually restores
> true passband tuning.  Has anyone done this little mod and if so, what
> was your  experience with it?

> Thanks Very Much !

> Dave  KB8VJD



 
 
 

IC-765 Pin Diode Mod & PBT Mod ???

Post by M.E. » Thu, 18 Apr 2002 08:39:23

Not worth the time and expense for EITHER rig.

Find a replacement for that *** "hissy" audio amp IC, and now your on to
something good.

--
Respond to my "real" e-mail;


> I have a '761..  wonder if that PIN diode mod works on the '761?

> '73  KI4Z


> > I recently acquired a nice used Icom 765.  I have heard reference to a
> > mod that replaces the switching diodes with pin diodes to improve the
> > receiver performance.  Does anyone have any details on this mod?
> > Someone told me there was an Icom service bulletin on this update but
> > I cannot find any info on it.  I do have the service manual  though.

> > Also, there is a commonly posted mod that supposedly restores the
> > passband tuning (PBT) function like it was on the 761.  However, there
> > appears to be some discussion as to whether this actually restores
> > true passband tuning.  Has anyone done this little mod and if so, what
> > was your  experience with it?

> > Thanks Very Much !

> > Dave  KB8VJD