[1000mp] Antenna relays

Sat Dec 20 05:37:07 EST 2008

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
> >>>>
> >>>> ______________________________________________________________
> >>>> 1000mp mailing list
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> >>>> Help: http://mailman.qth.net/mmfaq.html
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