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[Yaesu] MkV RX Problem

To: yaesu@contesting.com
Subject: [Yaesu] MkV RX Problem
From: Charles Bibb <zedkay@bellsouth.net>
Date: Thu, 16 Feb 2006 15:53:33 -0600
List-post: <mailto:yaesu@contesting.com>
Hi, All

Got my Mark V back from Yaesu service about two weeks ago. Had no power 
output after a nearby lightning strike. Turned out to be a few blown diodes 
and caps; relatively minor. Turn around time was almost exactly 2 months.

Now, however, I'm noticing a new problem, this time with the RX. When 
strong signals are present, I hear copies of them at 11-13 khz above and 
below the actual signal. Usually it is at 11.6 khz either side of the real 
signal, but varies a little by band. It is present when using any of the RX 
antenna jacks, "A", "B", or the separate RX antenna jack. I've eliminated 
any external devices in the line as the cause, so it's definitely happening 
inside the Mark V.

Does anybody know what this is?

This screwy RX behavior did not occur before the TX failed, but may have 
been present when I sent it out to Yaesu. I was so involved with the TX 
problem that I didn't do any rigorous checking of the RX because it seemed 
fine just tuning across the bands. Just in case, I asked Yaesu to check out 
the RX and they said they checked and aligned it and that everything was 
fine. This, however, it NOT fine.

I first noticed it on 20 meters SSB while working the 3Y0. I was using dual 
RX at the time and began hearing some of the stations calling the 3Y in the 
LEFT earphone. Now, I know the audio from both the main RX and sub RX is 
mixed, with the main appearing mainly in the left earpiece and the sub 
appearing mainly in the right earpiece (the way I had the menu set), but I 
was hearing the calling stations in BOTH. After further checking on CW, I 
found what was really happening. Filter positions don't seem to affect 
it.  Receiver performance seems fully up to specs, except for the "extra" 
signals. Curiously, it doesn't seem to happen on 160 or 80. I have heard it 
on 40, 20, 17 and 15 meters.

Has anyone else had this problem?  Am I about to have to ship it back to 


Charles - K5ZK

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