[ICOM] 751A Main RF Board

[Gary P. Fiber]

Hi Adam,

I never knew where the suit came from. I did know is was a Icom Japan 
issue not Icom America.
I do remember though the IC-751A having PBT reinstated.

I don't remember exactly if they ever put PBT back into the R-71A seems 
they did before its production ended.
Don't remember Icom ever stopping production of the IC-735, its been a 
long time ago but I was there during that period 1989 - 2001.

Yes the IC-765 was designed without PBT though W2ISB had a modification 
to restore it. Several who did his modification were happy with the 
results of it.

I remember the x75 series, they installed a data level in place of the 
PBT tuning. The PBT can be restored in the x75 series or could.
It was not a simple jumper pull though as it required the pot to be 
changed to a dual one and a filter added at least. I don't remember all 
of the requirements.

Circuits, they can be hard to design.....at one time Uniden, through 
company acquisitions which included patent rights, owned about every 
signal scanning topology design in existence that was used in radio 
receivers to stop them on an active signal. They also defended that 
ownership a few times.

This is good for me, sure rattles the brain and memories. :) Makes me 
wish I had written all of this information down during my 11 years.

I hope Eddy comes to a good resolution for his IC-751A.

Gary K8IZ




Adam Farson wrote:
> Hi Gary,
>
> My  understanding is that the PBT infringement suit was brought by a
> Japanese engineer who claimed that he had invented the circuit topology Icom
> was using. The suit was finally settled in 1990; as a result Icom reinstated
> PBT in the IC-751A (and possibly the R71) and resumed production of the
> IC-735. They did not add PBT to the IC-765 or restore it in the IC-x75
> VHF/UHF all-mode series. 
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
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