[1000mp] Re: Relay thing..deaf receiver

[Cecil Acuff]

All,

    My focus for finding a replacement is on the T/R switch relay.  My only 
concern is that finding a replacement that would work in an early MP like I 
own would not be a suitable replacement in a MKV and/or Field.  Please 
forgive my lack of knowledge of the differences between the MP, MKV and the 
Field.  I have never owned a MKV or a Field.  Are all of the above 100W 
radio's or is one of them (Field?) a 200w rig with external power supply in 
typical Yaesu fashion.  I could do some research and figure it out but it's 
probably quicker for the purpose of my learning to ask here.  The reason for 
the question is this...if one is a 200W rig it is very conceivable that it 
uses a different T/R relay to handle the heavier RF currents...and if that 
is the case can that rig be excluded from the pool of problematic radio's. 
Has this problem been experienced by users of all the variants of the MP 
series.  Narrowing it a bit might make it easier to come up with a 
solution...heck if the 200W rig (if that's the case) doesn't experience this 
problem and the RF UNIT board layout is the same as the 100W rig with just a 
different P/N relay that might be the solution.  (I know that's a stretch 
but it's worth looking at)

Exploring all angles here....

Some background....I've been doing component level technical work for 30+ 
years and have a well equipped shop to help figure this type stuff out.  I 
am an MP owner by chance.  I picked up one from a friend who had stuck it in 
the closet after it "acted up" and decided to sell it to me after hearing I 
was looking for some InRad filters for my FT-1000D.  A few in the MP filters 
are the same as used in the D series.  To make a long story short his MP was 
full of InRad filters (no roofing) and I basically bought it for the value 
of the filters.  It was a very near mint radio without a scratch, original 
boxes, Service manual, desk mic etc....so I became an MP owner.  Only 
problem I have found with it is occasionally the DSP system will go off into 
never-never land after a key down cycle resulting in broadband high level 
noise in the audio output reset only by powering the radio down.  I plan to 
replace the appropriate DSP board and eliminate the problem.

If anyone has an MP that they have relegated to a parts radio that has the 
DSP boards in it that they would like to part out I would be interested, 
otherwise I will probably purchase them from Yaseu if they are still 
available.

Any input on the relay data needed to figure this out would be very helpful 
to the group effort.  We should be able to fix this problem.....

Cecil Acuff
WB5VCE


----- Original Message ----- 
From: "Tod" <tod at k0to.us>
To: "'All about Yaesu 1000mp'" <1000mp at mailman.qth.net>
Sent: Wednesday, September 06, 2006 8:09 AM
Subject: RE: [1000mp] Re: Relay thing..deaf receiver


> Uwe:
>
> To provide another anecdotal data point let me confirm that the action and
> result described by Rich, WA7KMA, is exactly what I have noticed.
>
>> If we read carefully, what Rich, WA7KMA wrote:
>> "A brief tap of the key or ptt brings it right back",
>
> Your conjecture "... my number one guess would also be the T/R switch
> relay." seems very plausible.
>
> That would tend to put the focus on the T/R relay and possible 
> replacements
> that would eliminate or reduce the probability of failure.
>
>
> Tod, K0TO
>
>
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