[Icom] IC-751A vs. IC-765

[Floyd Sense]

Adam - can you elaborate on the second item you mentioned as shown below?
What do you mean when you say "PBT is cranked up" ?   I have an 1800 series
765 with the PBT mod installed and haven't noticed any attenuation of the
high frequencies, except as a result of narrowing the bandwidth with the
PBT.  I haven't measured the passband response of the SSB filters, but maybe
that would be interesting to do.  I have the audio mod installed as
described by Dean Straw a few years ago in QST.

I've never run across any info describing a correction to a termination
problem with these filters.  Do you know how it was corrected in the later
models?

K8AC
Floyd Sense in Angier, NC

----- Original Message -----
From: "Adam Farson" <farson@shaw.ca>
To: <icom@mailman.qth.net>
Sent: Thursday, October 31, 2002 12:17 AM
Subject: RE: [Icom] IC-751A vs. IC-765


<<snip>>
> 2. Mis-terminated SSB IF filters, causing up to 6 dB of passband ripple
> (corrected in S/N > 3000). This causes severe attenuation of "highs" in
the
> recovered audio when the reconstituted PBT is cranked up.
>
> These issues can be addressed by looking for an IC-765 with S/N > 3000 and
> performing the W2ISB PBT Mod. This is in a downloadable archive:
> <http://www.qsl.net/ab4oj/download/download.html>
>
<<snip>>