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Jim Scales problems with the VM1000 system are similar to mine.  I have
only 10 hours on my 320 but since the 5th flight I have had all the
annunciator lights come on when I press the PTT.  I believe this is due to
radio interference with the VM1000 DPU.  For the following reasons.  The
first five flights were testing using only two radio frequencies (122.85
and 129.55).  These frequencies were for the airport we operated out of and
for along range radio test.  The first time I flew cross country I had to
call on a frequency higher up the band (I cannot remember the exact freq
but it was around 132).  This was the first occasion all the annunciators
came on since then it has happened quite few times and only when the PTT is
pressed.  However, if I let go of the PTT, and transmit again it's okay.

I believe the VM1000 DPU is sensitive to certain radio frequencies and that
it is "spiked" by these on occasion.  All my installation is Vision stuff
and so far I have not had fuel indication problems.

I was 'putting up with it' but would be very interested in the experience
of others.

Michael
LNC2 G-FOPP (Cranfield UK)

 Dr Michael A Fopp
 michael_fopp@compuserve.com
 Signed at 17:27 on 24-Sep-00
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