[1000mp] Antenna relays

[Kostas SV1DPI]

As many others i had this problem also. It happened to me only on 20m. I 
sent my mark v for repair because i thought this problem would be probably 
dangerous in the near future. A friend of mine had a new unused mark v field 
and borrowed it to me just to have a radio until my lovely mark v would be 
back. What a surprise when i noticed the same problem in the new field.
So i decided that it would be an rfi problem. I used more ferrites in my 
cables and i have not seen the problem so far. By the way the repairman 
replaced the output relay but he couldn't reproduce the problem and replaced 
it just in case...
73 Kostas sv1dpi

----- Original Message ----- 
From: "Scott Galbraith" <scottg at n3ok.com>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Saturday, December 20, 2008 5:12 AM
Subject: Re: [1000mp] Antenna relays


> I've had this problem several times over the years. The first time was 
> perplexing until I
> "cured" it when I discovered and repaired an antenna problem. Every time 
> since, when it
> happens, I check antenna system and usually find a connector fault or 
> something similar
> (usually intermittent as cables/wires/etc. blow in wind), fix that problem 
> and the
> "intermittent front end" goes away. Check your connectors, especially 
> braid and center
> conductors for bad solder joints, or N-type connectors with center pins 
> pulled back, etc.
>
> - Scott
>
> Jürgen and Kathy Nittner wrote:
>> Garry Shapiro wrote:
>>> Tod:
>>>
>>> I encountered that exact problem with my MP while it was still in 
>>> warranty; it first manifested while I was operating at 3B9R in 1999. 
>>> Subsequently, Yaesu professed profound ignorance of the problem. I then 
>>> sent in the radio with explicit, detailed, can't-miss instructions how 
>>> to replicate the problem, and was told shortly thereafter that the 
>>> problem could not be replicated. That was incredible to me, because the 
>>> dropout by then was occurring every 10 or 20 TX/RX cycles. After further 
>>> discussions by telephone, a bunch of front-end parts were replaced, 
>>> including several DIP relays, but the bag of used parts accompanying the 
>>> returned radio were not identified.
>>>
>>> The Yaesu "fix" lasted several years, but again appeared. Recently, I 
>>> sent my radio to WA4GEG in Tennessee for a display board problem and 
>>> mentioned this, and Byron replaced six or seven relays. So far, so good. 
>>> The second MP I have, purchased only a few years ago, also occasionally 
>>> manifests the problem. I have little doubt that a relay is the culprit, 
>>> but I am not sure which one.
>>>
>>> To my knowledge, Yaesu has /never/ acknowledged this problem, although 
>>> it has been discussed many times, by myself and others, on this 
>>> reflector. Yaesu's denial--despite multiple complaints--is both 
>>> unfathomable and unacceptable. When Chip Margelli was working for Yaesu, 
>>> I toggled him, but he never responded.
>>>
>>> I just went back over my stored messages, but, alas, I have not kept 
>>> them back that long. You might, however, key on my name or callsign in 
>>> the archives, starting in the Spring of 1999, to see what pops up. I am 
>>> afraid that all you will find, however, are detailed descriptions of the 
>>> complaint.
>>>
>>> Yaesu's attitude on this matter has a payback. My next radio will be a 
>>> K3.
>>>
>>> 73
>>>
>>> Garry, NI6T
>>>
>>> Tod -ID wrote:
>>>> Over the years people have posted information relating to sudden,
>>>> intermittent changes in RF input signal level which often seemed to be
>>>> caused by the small antenna relays in the RF section of the MP.
>>>> I am experiencing such intermittent RX signal reduction as I use the 
>>>> radio .
>>>> If the RX signal level drops I can almost always send a dit and the 
>>>> signal
>>>> level will pop back up to the previous level. One might well think that 
>>>> the
>>>> relay contacts have become fouled.
>>>> Before I began the search of the archives for historical comment on 
>>>> this
>>>> problem I thought I would post the problem on the reflector and ask 
>>>> people
>>>> to give me suggestions on what terms I should use in the search if I 
>>>> want to
>>>> find pertinent material faster.
>>>>
>>>> If you have the 'solution' feel free to send that along, otherwise any 
>>>> help
>>>> would be appreciated.
>>>>
>>>> Thanks, Tod, K0TO
>>>>
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>>
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