[1000mp] MP dropout

[Garry Shapiro]

Fred:

There is a well-documented issue with a DIP relay in the front end of 
the MP and Mk. V with symptoms similar to what you describe. However, it 
is not limited to SSB, and does not manifest as total audio loss. 
Rather, the signal is attenuated dramatically, but not totally gone. Are 
you saying your problem only appears on SSB, or do you not operate CW 
and therefore are unable to widen your observation? The part about 
cycling TX/RX to clear it definitely fits.

I suggest you check further to determine conclusively whether you 
observe a total or partial loss of received signal, and whether it 
occurs on just SSB or all modes, and also whether it is observed on one 
band or all bands.

I first encountered a problem operating 160 CW from 3B9R in 1999 with my 
MP that was still in warranty. That radio went to Yaesu, where the tech 
claimed he could not reproduce the problem, even though I had included 
detailed instructions how to do so. He replaced a bunch of parts, which 
were returned to me, although with no list of reference designators. The 
problem was gone but appeared again some years later. That reappearance 
may or may not have been due to the same cause. I  now believe the 
current problem is due to an Ameritron relay box up in my array.

That said, there have been numerous complaints about this over the years 
and you should be able to find them in the archives for this reflector. 
To my knowledge, Yaesu has /never/ acknowledged this problem and emails 
at the time to Chip, K7JA were unanswered until after Chip left Yaesu.

73,

Garry, NI6T