[1000mp] MKV RX Relay Problem

[Thomas Otterbein]

Hello...

I had the same problem twice (MkV Field) and it was repaired 
under guarantee at Yaesu Europe. 
The first time it occur after about two month and the second time 
it occurred after repairing again after 2 month.

The transceiver receiver was muted after switching von RX Antenna 
to the main antenna. And also, sometimes when switching the VFR on and off.

During the failures it was always the relays RL1002, RL1005 at the RF-Unit.

Now I have no trouble since more than one year. I don't know what Yaesu did
at the repair works, but I disconnect now the antenna via a external antenna

switch from the transceiver, when I'm not operate it.

I believe, that may be electrical loadings from the antenna damaged the 
relays over the time.


This issue is a real weak point of the MkV. And as I read long time this 
list, it happen quite often.


Have a nice day....and a good an successful New Year!

73 de Thomas
DG8FBV
---
www.dg8fbv.de


> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of Garry Shapiro
> Sent: Donnerstag, 29. Dezember 2005 07:35
> To: All about Yaesu 1000mp
> Subject: RE: [1000mp] MKV RX Relay Problem
> 
> 
> It could well be that different relays are intermittent in
> different radios. I have never been able to conclusively 
> isolate mine, because it always occurs when operating!
> 
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Paul Baldock
> Sent: Wednesday, December 28, 2005 5:53 PM
> To: All about Yaesu 1000mp
> Subject: RE: [1000mp] MKV RX Relay Problem
> 
> 
> At 05:18 PM 12/28/2005, you wrote:
> 
> >Would you send a schematic of your "fix"?
> 
> 
> So far this only occurs when I go from RX ANT to ANT A /B,
> and the sensitivity is decreased on ANT A/B, hence I'm trying 
> to pass DC current through the ANT A/B contacts not the RX 
> ANT contacts. If you have intermittent reduced sensitivity on 
> the RX ANT position then that involves different contacts.
> 
> I've just tested it with clip leads on the bench so far. I
> can't see any down side to applying a little DCI to the MKV 
> ANTA/B terminal. I will put it in an RF tight box in a few 
> days and test it out.
> 
> Paul