[1000mp] MP receive problem

Tue, 21 May 2002 00:27:50 +0000

If you check deeper, you might be able to find a superior relay to the 
Matsushita.
If you do, let us all know, please.
Thanks, Tom K5IID

At 21:32 05/20/02 +0000, you wrote:
>At 20:13 5/20/2002 +0000, Garry Shapiro wrote:
>>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.
>
>My problem was band specific - 40M.  Using the Ant "B" port didn't help. 
>An antenna on the ANT RX (external receive ant. port) bypasses both the 
>LPF and HPF boards and this can narrow down somewhat to what boards the 
>problem might be located.   This helped narrow my problem to the HPF board 
>- as soon as I switch to the RX ANT the problem disappears.
>
>
>>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.
>
>Yep - at least on the HPF board the 8 relays are all Matsushita 
>HD1-M-DC12V parts.  Anyone know of a small quantity supplier of Matsushita 
>relays other than going to Yaesu?   I looked in my Mouser and Digi-Key 
>catalogs and Matsushita wasn't listed in their relay product offerings.
>
>73 Phil NA4M
>
>
>>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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>>
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>-. .- ....- --   -. .- ....- --   -. .- ....- --   -. .- ....- --   -. .- 
>....- --
>Phil Duff NA4M     [email protected]   Georgetown, Texas
>
>
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Tom Horton	
K5IID in West "BY GAWD" Virginia
" E " sorter for the W5 Bureau	