[ICOM] PBT Mod and questions

[Gary Fiber]

I don't know much about the original dispute or 
whom it was with. It just was not talked about within the company.
I do know we had to be real careful talking about 
the 751A as PBT was jumper change to enable.
Delivery of the 735 never stopped neither did the 
781. The 781 PBT was Icom's own design. I suspect 
some agreement was made about the PBT in the 735.

The 751A and the 75 series had PBT removed so the 
products could remain in the product line while 
the dispute ran through the litigation process. The 761 was discontinued.
The 761 was replaced in 1989 shortly after I 
arrived at Icom with the 765. The 765 was never 
designed with PBT in mind, though there have been 
mods that get it close to the PBT design and function.
I don't know how the resolution was worked out 
but quite a few of Icom's products now have the Twin PBT design.
I think the 75 series PBT reinstall requires not 
only the control but the filter as well.

This is similar to the Uniden scan circuit law 
suit. Uniden sued a few companies over that and 
the R1 got their attention at the time.
Uniden through various company and product line 
acquisitors held most all patents of receiver 
scanning circuits at that time and likely still 
does. They sued over circuit design infringement.
I always thought some of the reason Icom did not 
do banking and other features some of the police 
scanners had, was due to Look and Feel of other manufacturers products.
I am sure they wanted no part of further litigation.
More to that what meets the eye in manufacturing electronic products.

On another note I am going to install my antenna 
mount on my new RAV4 and hopefully get the 
706MKII reinstalled in the vehicle over the next week or so.
The mount is for the HS-1800/Pro antenna and will 
be bolted on the side of a 2 inch receiver hitch.

Gary K8IZ


At 10:01 AM 3/25/2006, you wrote:
>Hi Warren,
>
>My understanding is that the patent dispute was with a Japanese engineer who
>held the original PBT patent. In any event, the dispute was settled in 1990.
>Icom responded by releasing the "Series 3" IC-751A (new logo/PBT) and
>resuming delivery of the IC-735.
>
>There were 3 series of the IC-751A: 1. old logo/PBT. 2. new logo/IF shift.
>3. new logo/PBT.  There is a procedure for enabling PBT on the Series 2
>IC-751A here:
>
>http://www.qsl.net/ab4oj/icom/icom.html#ic751a
>
>I have done the PBT mod on the IC-765 and IC-751A, but never on the IC-x75
>series. The mod consists of re-installing the control and wiring it in, as I
>recall.
>
>Cheers for now, 73,
>Adam VA7OJ/AB4OJ
>
>
>-----Original Message-----
>From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
>Behalf Of flearl at msn.com
>Sent: 25 March 2006 07:59
>To: icom at mailman.qth.net
>Subject: [ICOM] PBT Mod and questions
>
>Hello:
>        I have a newer Icom 275H that does not have PBT.  It has the "Data
>Level" control which I don't use. Has anyone performed the PBT restoration
>mod found on modsDK?  Did it work as advertised?
>I think PBT is a very useful feature, might be worth restoring it on the
>275H.
>I have an Icom 751A with PBT, did Collins sue Icom in the early 1990's for
>some sort of patent infringement on the PBT circuitry found on older Icom
>Radios?
>What was the outcome of that situation?
>73
>Warren Flearl NØWF
>
>
>
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Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident