[Icom] 765 TR relay

Wed, 05 Mar 2003 23:39:37 -0800

Hi Bruce,

My pleasure. I am glad the information was helpful.

The PBT mod is virtually mandatory, as the IF shift implementation is
horrible. It switches out the 9 MHz IF filter, thus ruining the close-in
dynamic range of the receiver. If the filter bandwidths and shape factors
are closely matched, the PBT is not bad - about as good as one can achieve
with analogue filters. The W2ISB PBT mod takes all of 15 minutes.

<< Now if there was only a mod to make the broadcasters go away on 40 meters
at night . . . . >> Well, I found the mod! I moved out here to BC. Canada
enjoys both Region 1 and Region 2 amateur-band allocations. Just the other
evening, I was working JA's and ZL's simplex (not split) between 7050 and
7080. <g>

Cheers for now, 73,
Adam VA7OJ/AB4OJ

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Bruce D. McLaughlin
Sent: Wednesday, March 05, 2003 19:11
To: [email protected]
Subject: RE: [Icom] 765 TR relay

Adam.  Gosh, I do indeed thank you for all of that very helpful
information.  I am going to try the external mod first as you suggest
and see what it does.  If it helps, I will look into the more permanent
mod.  And I have been debating and debating doing the pass band mod for
quite a long time now.  I may finally be moved to do it.  80% of my
operating is CW and I guess I haven't found the mod as necessary as it
probably is for SSB.  On the other hand, I do use the pass band on my
756 PRO from time to time.  It is very effective on SSB and CW.  But, of
course, the filter skirts on that radio are so steep that moving the
side of the filter just a little bit really makes a difference.  The 765
skirts are not as sharp by a long shot.

Now if there was only a mod to make the broadcasters go away on 40
meters at night . . . .

Thanks again for the fine information, Adam.

Bruce - W8FU