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romott(at)sprintmail.com
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 Posted: Fri Jun 01, 2007 3:24 pm Post subject: Noise on the Com |
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I am chasing noise on my Garmin 430.
It is a clicking noise (like spark plugs) that I am picking up on the
antennae lead of my 430. The frequency changes with engine RPM. I have two
antennas - one in each winglet of my Velocity. Swapping antennas makes no
difference.
Disconnect the antenna from the radio and the noise goes away. Turn off my
Jeff Rose Electroair and the noise goes away. I have installed new spark
plugs and new ignition wires, still have the noise. Interestingly, the #2
COM, a Microair 760 does not have this noise.
I have checked grounds on my ignition system and on the 430, no problems
found.
I'm thinking of making a small antenna to connect to the 430 and use it as a
wand to locate the source. Any other ideas on locating the source?
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nuckollsr(at)cox.net
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| Posted: Mon Jun 04, 2007 8:31 am Post subject: Noise on the Com |
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At 07:23 PM 6/1/2007 -0400, you wrote:
| Quote: |
I am chasing noise on my Garmin 430.
It is a clicking noise (like spark plugs) that I am picking up on the
antennae lead of my 430. The frequency changes with engine RPM. I have
two antennas - one in each winglet of my Velocity. Swapping antennas
makes no difference.
Disconnect the antenna from the radio and the noise goes away. Turn off
my Jeff Rose Electroair and the noise goes away. I have installed new
spark plugs and new ignition wires, still have the noise. Interestingly,
the #2 COM, a Microair 760 does not have this noise.
I have checked grounds on my ignition system and on the 430, no problems
found.
I'm thinking of making a small antenna to connect to the 430 and use it as
a wand to locate the source. Any other ideas on locating the source?
|
The sniffer probe is a good idea. See if you can
hear the noise on a hand held. Use headphones so
that you minimize environmental noises. Use handy
length of coax and probes like
http://www.aeroelectric.com/Pictures/Tools/Sniffer_Probes.jpg
to poke around the wires and black boxes.
Try running the ignition system off of it's own battery.
Get a couple of 6v lantern batteries to hook in series
as a test supply. It's just possible that the noise is
coming out of the power supply leads and being radiated
by ship's wiring such that the radio hears it.
Bob . . .
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