[Icom] 765 TR relay

Wed, 5 Mar 2003 21:51:00 -0500

That's very interesting, George.  I appreciate the information.  I will
look further into it.

Bruce - W8FU

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of George, W5YR
Sent: Tuesday, March 04, 2003 7:04 PM
To: [email protected]
Subject: RE: [Icom] 765 TR relay

Bruce,  I am really digging back into the past, and this may be all wet,
but
seems that I recall that this problem is the result of a fine layer of
corrosion building up on the TR relay contacts. The cause of this is the
negligible amount of current that the contacts carry, thus there is no
mechanism to "burn off" the corrosion as it develops.

Now, I am really digging . . .

I think that Icom or someone came up with a simple mod to pass a small
current through the relay contacts and avoid the problem altogether. I
do
not have my Icom 765 notebook handy or I could look it up for you. If I
can
find this later, I'll put it on the list or perhaps Adam or someone else
recalls the reference and can post the procedure.

I may be completely wrong in suggesting that this is the source of your
problem, yet your description is ringing bells back in the dark recesses
of
what I used to have for a mind.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Bruce D. McLaughlin
> Sent: Tuesday, March 04, 2003 5:42 PM
> To: [email protected]
> Subject: [Icom] 765 TR relay
>
>
> Well, I think my faithful 765 may be developing arthritis of the TR
> relay.  After a few minutes, it sometimes loses sensitivity on
receive.
> If I send a dot or dit, the sensitivity immediately comes back.
> Sometimes it remains OK for the rest of the session and sometimes I
have
> to dit again once or twice.  Does that sound like TR relay trouble?
>
>
>
> If it is trouble with the TR relay, how much of a problem is it to
> replace.  I don't have a service manual unfortunately so I am trying
to
> make a preliminary assessment as to whether this is something I could
> reasonably do myself.
>
>
>
> Bruce - W8FU

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