[1000mp] MP receive problem

[Bob Thacker]

I had a similar problem on 80 meters and diagnosed it to a dirty relay.
Before opening the hood, something told me to check it into a dummy load.
Upon that examination I found that the problem could not be duplicated,
however when the antenna was switched in, the problem reoccurred. Eventually
the problem was traced to a wire that became loose on the 80 meter gamma
match that fed the tower. Morale here is to check everything. I was mighty
quick to blame the MP because of all the rumblings on the reflector.

73,

Bob, K3GT

Subject: Re: [1000mp] MP receive problem


> Phil, NA4M wrote:
>
> "When selecting 40m the received band noise & signals are barely audible
> for a short time (varies but usually 1-2 minutes) before the receiver
> seems to recover.   Selecting an antenna on ANT RX (external receive ant.
>  port) results in normal receive levels."
> ==========
> I had a similar problem occasionally with my MP, but it wasn't
> band-specific.  Garry, NI6T has also had the problem and I've heard
> others complain about the same problem on this reflector.
>
> On my MP, it sounded like it might be a dirty antenna relay contact
> somewhere in the radio.  Whenever it would happen, I would send a dit
> with my paddle (or press/release PTT on SSB) and that would always
> restore the signals to normal level.
>
> I also found that if I punched the ANT A/B pushbutton twice (or turn the
> RX ant on/off) that would also restore the receiver to normal.  This
> seemed to verify my "dirty antenna relay contact" theory.
>
> I haven't noticed the problem now for a couple of years (I've had my MP
> now for 4 years), so after thousands of cycles it appears that the
> offending contacts have wiped themselves clean.
>
> Garry, NI6T sent his MP into Yaesu for the problem while his radio was
> still in warranty.  He said they told him they could not duplicate the
> problem on the bench, but they replaced a few parts anyway (including one
> or more relays).  Garry said that what they did seemed to alleviate the
> problem for a while.
>
> 73, de Earl, K6SE
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