[1000mp] MP receive problem

Mon, 20 May 2002 20:13:17 -0000

As Earl points out, below, my and his incidents were not band-specific. Now
that the probelm has returened, hext time (if not in the middle of a pileup
for a New One) I will try switching to Ant B and see if it is THAT relay.

I have not checked by scrutinizing boards, but it is likely that one model
of relay was used in many locations. It may well be that defective relays of
this model account for the variants of the problem that are being reported.

Garry, NI6T.

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of [email protected]
> Sent: Thursday, May 16, 2002 08:34
> To: [email protected]; [email protected]
> 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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