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>I think the VM 1000 and Electronics International may have some problems.
Anyone else having this problem?  Anyone solved it  yet?  Any suggestions?
<

It is well documented that the Electronics International is subject to the
problem you describe (see the Lancair Network News for solutions).   I am
using the VM800 with out any problems and know of many other VM 1000
installations that do not have the problems you describe.

These are tricky problems to resolve.  The first thing you might consider
is to disconnect the coax from the COM radio and in its place install a
portable length of coax with a conventional antannae and ground plane.
Move the temporary antannae and coax to various locations and see if the
problem still exists.  You may find that the solution is to simply relocate
the coax.  You may also discover that  your installed coax or antannae is
damaged resulting in lots of RF spewing out the cable rather than the
antannae.  

Simple solutions like putting a 2 or 3 loops in the fuel sensor cable  (try
several diameters)  or installing a bead core around the sensor cable that
is designed to filter electromagnetic interference may also solve the
problem. Bead cores are available from many electronic stores. I believe
those cylinderical buldges on your computer monitor cable are bead cores
just so you know what I am talking about.

The best technique to avoid these troubling problems is to observe good
wiring practices from the start.  Not routing coax, power and sensor cables
in the same harness is a good practice. When power cables, coax and sensor
runs need to cross, do so at 90 degree angles.  Always shield the sensor
cables grounding the shield at only one end, etc. and etc.  Even then,
there are no guarantees.  Good luck.

Jim Frantz
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Please send your photos and drawings to marvkaye@olsusa.com.
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