[1000mp] Antenna relays

Garry Shapiro garry at ni6t.com
Sat Dec 20 17:54:37 EST 2008 

Thank you, Thomas. After ten years, someone has finally identified the 
components responsible for the condition---and it was not Yaesu.

Garry, NI6T

Thomas Otterbein wrote:
> Hi all....
>
> I think this is one of the weakest point of the FT100MP
> (muting signal).
>
> In my case it was two times always faulty relays, 
> RL1002, RL1005 at the RF-Unit.
> It was never the antenna relays  at the RF-output 
> ANT1 and ANT2. 
>
> I discussed this matter also with a technican at  
> the HAM RADIO in Friedrichshafen. 
> They didn´t gave me detailed information but told me,
> that this defects "sometimes"  occure. 
>
> It seems that the relay are to sensitive for static 
> voltages.
>
> I had this problem twice and since I´m always disconnect 
> the antenna when the rig is not in operation, I have since 
> years no problem at all.
>
> 73!
> Thomas
> DG8FBV
> ---
> www.dg8fbv.de
>
>
>
>
>   
>> -----Original Message-----
>> From: 1000mp-bounces at mailman.qth.net
>> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of Kostas SV1DPI
>> Sent: Samstag, 20. Dezember 2008 10:07
>> To: All about Yaesu 1000mp
>> Subject: Re: [1000mp] Antenna relays
>>
>>
>> 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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>>>>>> Help: http://mailman.qth.net/mmfaq.html
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>>>>>>             
>
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