[1000mp] sticking relay problem

[W0UN -- John Brosnahan]

All of this is interesting to me since this issues are similar to the
problems I posted a week or two ago.  In my case I had been using
my MP for RX only.  I don't have a decent antenna yet and I listen
to AM with it while I am on the computer.   It would be fine for
an hour or two before it had (apparently) warmed up enough to
start acting up.   When I decided to unpack an antenna tuner
and try it for TX as well as RX is when I started really noticing the
issue.

I am certainly interested in anything that comes from this discussion.
I have a "Technical Supplement" on order from Yaesu and will get
serious once the maintenance manual arrives.

Here is a list of my (previously-posted) symptoms as a refresher.
Since the problem for me is on all bands and does not seem to
be related to either of the two receivers I am inclined to think it
is limited to a small amount of circuity close to the antenna input.

I also find it interesting that when it dies it takes a second to
fade out and when I hit the MOX and it comes back then the
next time it fades out it takes another second or so -- rather
than "instanly".

--John
----------------------------------------------------
Here are the symptoms for me---

--It runs for an hour plus and then dies.  But the death is not instantaneous
         but rather it takes a few (couple of) seconds for it to fade out.

--In dual RX both channels die--since the phased locked loops
         are separate this would indicate that it is not a synthesizer--
         but rather a problem in an area common to both RX channels

--When I hit the MOX button, putting it into TX it will return to RX OK for
         a few seconds and then it fades out in another second or two

--Initial indications are that it is on ALL bands--so it is not a band pass
         filter problem in the front end.

--The fadeout is in the RF since the S meter also stops indicating--rather
         than in an audio stage.

--No display flashes -- once again making me think it is not the
         synthesizers.

--The failure appears to be the same whether the antenna is hooked
up to either A or B position OR even hooked into the direct RX position.


At 08:48 AM 3/22/2004, you wrote:

>Interestingly, I have had the exact same problem for some time. It started,
>as you described, with the radio going "deaf" only occasionally, but it got
>worse. Just as you mentioned SUB VFO B doesn't seem to be affected. As it
>got worse, I think that this same problem began to give a harsh note to many
>signals on CW.
>
>I finally got disgusted and called Burghart. I sent it to them and got it
>back after about 30 days. It still had the problem. I called them back and I
>returned it (no charge) for another 30 days. They seemed to have difficulty
>getting it to reproduce. I am not so sure that it is a relay problem.
>
>I have had the radio back for a while and I have still had two or three
>re-occurrences of the problem but it seems much better.  (It happened this
>morning while I was calling 3B9C.) Apparently, it is not so easy to fix.
>Hitting a dit or turning off and on doesn't seem to affect mine.
>
>I decided not to send it back again. (Burghart even offered to make a good
>deal on a new radio/trade-in. I think they are a pretty good company.)
>Finding an intermittent problem that happens every two or three weeks is
>pretty hard, and I don't want to give up my radio for six months. One of
>these days it will fail and I'll send it back.
>
>Que sera,
>
>Bill, W5VX
>
>"Organizations are aligned perfectly for the results they get."
>
>
>
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