On Sat, 25 Oct 2003 18:15:54 +0000, Chris Davison wrote:
A problem with interference, all advice welcome.
.radio by itself works fine...but when I turn the vario on I get huge
amounts of noise (even some with Squelch ON). Radio is a Dittel FSG50,
vario is Cambridge 302/303.
Where do I start looking?
Chris
I had a similar, but much worse problem, with an early 2 channel Magellan
GPS about 10 years ago. The GPS was mounted in a bracket on the panel of
my Nimbus II. The antenna was remote mounted on top of the instrument
panel with a foot long extension cable. There was a power cable with an
integral DC regulator which plugged into a 12V power socket that I fitted
behind the panel.
The interference was so bad that it would break through the squelch on the
radio of the glider lined up behind me on the start grid!
I eventually fixed it by wrapping both the antenna cable and the power
cable with steel wool (the stuff Grandma used for cleaning pots in the
kitchen). I pulled a large size shrink wrap over the wool and shrunk it in
place. The result was two rather ugly cables of nearly 1 inch diameter -
but no interference!
The 2 channel GPS had a habit of loosing the satellites in a thermal but
on the glides it would lock in and give a readout within a minute or so.
It cost me a small fortune at the time but was much less than price of a
more sophisticated unit. Compared to map reading it was great! I flew many
thousands of km with that setup.
Ian
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