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zeprep251(at)aol.com
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 Posted: Sat Nov 19, 2011 12:24 pm Post subject: radio noise |
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Pat Ladd,
I bought some ferrite chokes from Radio Shack last week.They were about $3.00 for a pack of two of them.I snapped them around the RG58 antenna cable and really reduced the amount of noise I was getting from the engines high tension electrics and the GPS.
G.Aman
[quote][b]
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sat Nov 19, 2011 6:09 pm Post subject: Re: radio noise |
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Something I did that was easy and helped cut down radio noise a lot: I disconnected the radio hot lead from the avionics bus and ran the power wire and ground wire straight to the battery with a small inline fuse. The radio power is now separate from the rest of the airplane. Big improvement.
The next biggest help - although a lot more trouble, and you need to do it when you build the airplane - use shielded wire for your mag switches. Those nasty little wires come right off your magneto and carry rapidly pulsing AC. Your spark plug wires are doing the same thing, at a higher voltage, but they are short, your kill switch wires are many feet long.
Worth what ya paid fer it -
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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byoungplumbing(at)gmail.c
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| Posted: Sat Nov 19, 2011 8:06 pm Post subject: radio noise |
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i installed an aprs ham radio tracker,,, and every time it sent out a
packet i could hear it in the intercom and it interfered with the eis... i
installed a ferrite bead in the power line to the tracker and eliminated the
noise and interference.. i also used coax for the mag switches. good
ideas going around here.
boyd young
mkiii ut
Something I did that was easy and helped cut down radio noise a lot: I
disconnected the radio hot lead from the avionics bus and ran the power wire
and ground wire straight to the battery with a small inline fuse. The radio
power is now separate from the rest of the airplane. Big improvement.
The next biggest help - although a lot more trouble, and you need to do it
when you build the airplane - use shielded wire for your mag switches. Those
nasty little wires come right off your magneto and carry rapidly pulsing AC.
Your spark plug wires are doing the same thing, at a higher voltage, but
they are short, your kill switch wires are many feet long.
Worth what ya paid fer it -
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pj.ladd(at)btinternet.com
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| Posted: Sun Nov 20, 2011 3:01 am Post subject: radio noise |
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re radio noise.
Thanks Gary.
Took the plane out of the air for the winter yesterday. Battery out, everything drained, wheels off the ground, plugs out and cylinders sprayed with oil so I won`t be able to do anything serious until the Spring.
The day of course turned out to be one of the best we have had for weeks. Sunny, windless with high thin cloud. Dammit!
To make me feel better today is misty, damp and cooler and the forecast is for dropping temps next week.This weekend last year the snow started and went on until February. This autumn is the most extended I can remember. Leaves are still on the trees and have not really changed colour. It has been sunny and warm. I have been wandering around without a coat. Birds are beginning to nest because they are responding to the Springlike weather. Very confusing.
Cheers
Pat
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zeprep251(at)aol.com
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| Posted: Sun Nov 20, 2011 8:31 am Post subject: radio noise |
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Yesterday was not a very pleasant day to fly.On a 180 heading at 2500 ft ground speed was below 40 and the return trip was bumpy enough to require full control inputs to keep the MK3 close to flat.Luckily I had a 230# passenger and ground speeds in the 80,s while keeping the airspeed in the 50,s because of the turbulence.In retrospect,should have followed Pat's lead and parked it.
My passenger,Gary Jindra,had the final inspection of his MK3 on Friday morning and it,s first flight shortly after.A little more pitch in the prop and some left rudder trim and it should be ready for duty.A very nicely done 3 yr project,including a 582 with a heater core with a small fan nestled in the nose cone.We'll see how that works out shortly.Temps were in the low 30's on Wednesday and back into the 60's by Saturday but with high winds out of the SW both days.Time to go south.
G.Aman MK3C Jabiru 2200A 655hrs
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