[ICOM] PBT Mod and questions

[Frank A. Ellis]

Hi Adam,

In the -x75 series radios, the center-detented PBT pot
was left as is (i.e. not replaced with a non-detented
pot) but was re-wired and re-labeled as "DATA LEVEL",
so there was no "missing control" to reinstall if PBT
was reinstated. It simply has to be re-wired back to
the original configuration. In addition, the -x75
PBT-enabled radios had a MuRata CFJ455K (-5 version I
believe) installed at the 455 KHz IF. This filter was
removed and a small capacitor was installed in it's
place to restore the signal path in the non-PBT
radios. So, in the -x75 series radios without PBT,
there was additionally a stage of selectivity missing,
along with no PBT.

73 Frank W3UHF



--- Adam Farson <farson at shaw.ca> wrote:

> Hi Gary,
> 
> Thanks for the clarifications. I had heard that
> IC-735 delivery was
> suspended for a while.  The Twin PBT design used in
> the IC-781 was a unique
> Icom design, and did not involve the patent.
> 
> I was not aware that the non-PBT IC-x75 versions
> were missing a filter.
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
> 
> 
> 
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