[1000mp] relay thing...deeeef receiver

[Garry Shapiro]

I know of no proof--or even a suggestion of proof--that regular use is a
factor, much less that a practice session before operating will forestall
the problem. In my experience, the dropout is equally likely at the
beginning, middle or end of a few hours of operating.

Garry, NI6T

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net
[mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Tod
Sent: Tuesday, September 05, 2006 7:36 PM
To: 'All about Yaesu 1000mp'
Subject: RE: [1000mp] relay thing...deeeef receiver


>
> I have not ever used an amp. Worse is that I almost never
> transmit, which given the contact dewetting mode of failure
> that has been postulated, probably makes my rig more
> susceptible. That is where I am worrying because it seems to
> me that unless the relay contacts have been improved or Yeasu
> comes up with a low DC current to add to the contacts to
> prevent the dewetting, I am just going to have the problem
> all over again. Are there better relays (that fit the board)
> or has Yeasu changed the spec. on the relay and improved
> things? I suspect a partial solution is to rag chew a lot (I
> am pretty much CW only), and cycle the T/R relay, but that is
> not answering my needs right now.


I rather suspect that the solution is to have a small current flow
periodically through the relay or to cycle the relay periodically. I have
noticed this problem but fortunately only very, very,very infrequently and
it disappears when I go through a single T/R cycle. I probably go through
enough T/R cycles in a single ARRL SS event to avoid seeing the problem.

I suppose that sending QSK CW into a dummy load for about one minute prior
to starting your listening session might be adequate to "exercise" the relay
and avoid the problem. If this really did do the trick I would suppose that
we could create a computer program that would provide the T/R relay exercise
on a regular basis.

At this point I suggest we find a way to treat the symptom and forget who is
acknowledging that there is a problem. If regular exercise prevents
'emergency surgery' I suspect that would be the preferred "work around" for
most folks.

Tod, K0TO



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