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Can't think of any reason for the EC2 to make ticking sounds in the radio
but I'd suggest the usual trick to check. Turn it off and see if the
ticking stops.
Tracy
----- Original Message -----
Sent: Friday, February 24, 2006 7:40
PM
Subject: [FlyRotary] Radio noise
progress
This morning on the way to the hangar I bought some more
ceramic disk
capacitors 0.01mF as suggested. Tried them on the fan.
No change. The
fan is Spal brushles I think? It has separate return
line to the
engine case.
While waiting for Jim to come with the
oscilloscope, I connected
(temporary) the large 20A Radio Shack
noise filter to filter the
incomming power to the avionics bus. BIG
improvement! I would say 80%
reduction in fan, fuel pumps etc.
noise.
Jim arrived with the o.scope and we connected it to the fan. Wow!
You
can see the noise. Started trying different disc capacitors I
had and
they did not make any difference. Jim asked me to buy few
different
ones at RShack and left to take care of business, but left
me the
o.scope. After trying few capacitors, 475mF did the
trick.
Now the high pressure FI pumps. They were making one hell of a
noise
filling the whole screen on the scope.
The avionics filter
was taking care of most of it, bit I can still
hear them. Went twice
more to RShack for bigger and bigger
capacitors. Finally the 2000mF
made difference on the screen, but not
enough. On the way home I
stopped again in RShack and got the biggest
one they had 5000mF and
hope in the morning to see a flat line on the
screen :).
Next is
the alternator, but had no time to run the engine today.
Thanks to
everybody for your suggestions.
QUESTION FOR TRACY: At all times with
everything else turned off
except master, I hear quiet noise in the
headset that's like a clock
ticking. If I disconnect the antenna
from the radio it stops. I was
wandering if there is something in
the EC that maybe doing
this?
Buly
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