[Icom] DSP for the older IC275H????

Sun, 09 Jun 2002 11:13:30 -0700

Clete,

The patent-infringement problem hit Icom in 1989, and was not settled until
1991-92. I believe that a Japanese engineer who held the patent for that design
sued Icom for infringement. The Twin PBT design used on the IC-781 was not
affected; but the IC-751A, R-71, IC-735, and the IC-x75 family were. The new
IC-765 came out with IF shift only, not IF shift/PBT as per its predecessor, the
IC-761.

The "Data" control is a level adjustment for AFSK input via the rear-panel ACC1
socket. It replaced PBT.

In 1991-92, Icom settled the lawsuit, and re-released the IC-751A and IC-735
with PBT, but not the other affected radios.

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Note new e-mail address:
mailto:[email protected]

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Cletus W Whitaker
Sent: Saturday, June 08, 2002 17:27
To: [email protected]
Subject: Re: [Icom] DSP for the older IC275H????

de WB2CPN South Central Pennsylvania    2002.06.08

My IC-275H is number 01086.  It has the PBT knob, and it works.  Did
they get into lawsuits after 01086?  What was the DATA knob for?
Very interesting.  Hey, I really do like my little radio, only thing is
I had to replace the dial lights.  Did that a couple of weeks ago.
What a pain that was.  Thank God I had the schematic, and that eack
plug and socket on the front panel was marked.     73 Clete