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radio / vario interference - HELP!
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 |
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Hi Chris,
I just went through this (breaking squelch) problem with my Borgelt B-100 and I found some very interesting things: 1. When the NMEA cable from the cambridge GPS was moved near the radio antenna cable, I got full squelch. Move it away and the squelch went silent. 2. When the cable going to the LCD display was moved near the antenna cable, I got full squelch. Move it away and the squelch went silent. My fix was to move the antenna cable (RG-58) to the other side of the instrument panel and routed it out the right side, about 12 inches AWAY from all the other cables. JJ Sinclair |
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Chris,
All cables are not equal. Make sure you have a shielded cable with ferrite supressor. Richard www.craggyaero.com "Chris Davison" wrote in message ... 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 |
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Solved same problem with 302/303 and Dittel FSG70M by rerouting the cable
from 302 to 303 (display). Turn everything on, squelch off and get teh noise. Then start unplugging cables-start with the 302 to 303 cable. As soon as the noise quits, you have found it! Good luck! -- Hartley Falbaum ASW27B "KF" USA "Chris Davison" wrote in message ... 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 |
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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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I have head that when you start with the aluminum foil, that soon the entire
cockpit, all the cables, boxes etc will be covered, and the interference will remain. Richard "Eric Greenwell" wrote in message .. . In article , says... 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! Why did you choose steel wool instead of aluminum or copper foil? -- !Replace DECIMAL.POINT in my e-mail address with just a . to reply directly Eric Greenwell Richland, WA (USA) |
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On Mon, 27 Oct 2003 20:47:48 +0000, Eric Greenwell wrote:
Where did the idea for the steel wool come from? I read a tip suggesting steel wool and shrink wrap, as a means of last resort. I think it may have been in a Sailplane and Gliding magazine. I experimented and it worked and so it stayed. (I had already tried various coax cables and grounding arangements without significant success.) Ian |
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