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rparigor(at)SUFFOLK.LIB.N
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 Posted: Mon Feb 16, 2009 1:25 am Post subject: Any ideas how to eliminate strobe noise? |
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The plane is a plastic XS Europa monowheel.I have a Kunzleman strobe power supply on the starboard baggage bay rib that drives wingtip strobes.I have two antennas, one Bob Archer big "E" on the vertical fin with RG-400 cable, and a Advanced Aircraft Electronics that is bent 90 degrees for both Nav and Com with RG-142 cable.I have a Vertex handheld VX-700 that if hooked up to either antenna will break squelch and tick, tick, tick with strobe illuminations. I have the squelch turned up all the way to #8. It does this with headsets or not. The radio is running on its battery. I have the strobes connected direct to the battery about 1 foot away from the Kunzleman power supply.I tried a Terra 720 handheld, and although I can squelch out the ticking, it has the squelch very high to do so and negates hearing talk I wish to. If I put a rubber ducky antenna on either of the hand helds, anywhere inside the fuse anywhere near the power supply it gets easily overwhelmed by strobe noise.I have the power wires for the strobes shielded and grounded to the battery. I tried it grounded and ungrounded, no change. I have the power supply chassis grounded to the battery and the strobe cable shields are grounded to the battery. I tried grounding the power shield at both ends, no success. I tried grounding the shield of the antenna cable, first at the radio end, then the antenna end, no change. I wrapped the entire power supply with aluminium foil and tried it grounded and ungrounded, no change. If either of the antenna cables are run in the fuse, the radiating noise is jumping into the cable, it is better the further away from the power supply I can get it, but still bad. I tried wrapping the antenna wires with aluminium foil, grounded and ungrounded, no change.If I take a handheld near the strobe head where there is several inches of unshielded wires, only if i come within an inch can I get some ticking and not even that bad. If I run the ducky antenna parallel to the shielded strobe wires within an inch, I can get some ticking but then again not too bad. If I put the ducky antenna anywhere inside the plastic aft fuse, can't find an area that is not being hit hard, especially near the power supply going on the starboard side or going aft.If I run the antenna cables outside the airplane by about 2 feet, all is noise free.Transmissions don't seem to be affected, and ticking can't be heard. It is just that squelch is being broken.If I put the ducky antenna near the Bob Archer antenna in the vertical fin, it is noisy there which means noise is getting onto antenna cable and making it's way back to antenna.Any ideas?I already have strobe heads mounted on wings and power supply mounted and beautiful harness made up.Perhaps some sort of filter? Seems it is worst closer to 108 and again at 135. but in between unacceptable.I contacted Kunzleman and he said sounds like I did everything right, said best contact antenna Mfg.Thx.Ron Parigoris [quote][b]
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Mon Feb 16, 2009 8:15 am Post subject: Re: Any ideas how to eliminate strobe noise? |
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Hey Ron!
There's no getting around the fact that spark generators produce RFI.
A xenon strobe is an electric discharge through ionizing gas. I know
you know that.
What your radio picks up is little dependent on where you run wires or
antenna, especially if you are using a handheld with its own battery.
The best you can do is reduce radiation from the strobe supply with
shielding and bypass caps (which are probably inside the supply
already). You might check to see if your bulb fixtures have a ground
plane hooked to main ground between the bulb and your antenna.
A good VHF receiver will pick up strobe discharges from planes
passing by at night. It is a badge of sensitivity.
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