Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: Thatcher on 13 August 2010, 16:41:27
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Interference is caused on 2 different tranceivers, when engine is running and when not.
Particularly bad on 144.5 mhz which is unuseable
Anyone any advice please?
2003 Omega auto
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Not noticed it myself but will check. I take it it's from something in the car? Does the key have to be in the accessory position, or the run position?
Kevin
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Don't get any interference on my 2m Yeasu, is it at any particular speed?
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I have no issues with noise on the 2 meter band in my Omega, but as it's a 95 I don't have that much electronics in it.
However, I do get a small range of noise when my stereo is on (Alpine head unit).
Does it happen all the time, or in certain situations? If it's there all the time I would think alarm system, info display (of any kind) or immobilizer transponder (although I think it's on 433'ish MHz).
Anyway, I reckon you're a ham then? ;D
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Anyway, I reckon you're a ham then? ;D
Oh, no. Looks like there's several of us. ;)
Kevin
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Hehe, yeah :)
Better set up some kind of OOF sked then? 80m is fine to UK usually.
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Hehe, yeah :)
Better set up some kind of OOF sked then? 80m is fine to UK usually.
Ahh, not a bad idea, actually. And a reminder to sort out my antenna system. ::)
Can't remember if it's the antenna or house wiring that's resonant on 80m at the moment. ;D
Kevin
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G1 or G8????
(that'll make a few people wonder what we are on about!!)
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G7 in my case. ::)
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Not a G at all here, I am an LA :)
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I'm an M1.
The rig hasn't been on for a while, so much else to do.
Ken
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G7 in my case. ::)
Old git :P
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G7 in my case. ::)
Old git :P
Think that makes me an older git then, G8P**, although not used it for a long while, guess that's what happens when you choose a career in Radio and Telecoms for the last 25 years. ;)
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G1 or G8????
(that'll make a few people wonder what we are on about!!)
Call signs :P
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G7xxx
144.5 iirc is prone to processor harmonic noise, particularly bad with old, old slow ones - so that may indeed suggest some damn chip that runs a display, gps, mobile phone unit, alarm unit, ecu etc -
To search you could try taking the antenna off the handy, seeing if it can still hear the noise and using it to try to pinpoint the source around the car?
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G7 in my case. ::)
Old git :P
Think that makes me an older git then, G8P**, although not used it for a long while, guess that's what happens when you choose a career in Radio and Telecoms for the last 25 years. ;)
I know what you mean.
I tend to get it out of my system in a couple of concentrated bouts each year.. VHF/UHF NFD being my favourite. Operated with G0FBB/P for the last couple of years (came 2nd last year, IIRC) 8-). They have lots of toys to play with:
:D
Kevin
(http://images.omegaowners.com/images/kevin/IMGP4668.JPG)
(http://images.omegaowners.com/images/kevin/IMGP4711.JPG)
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Nice field day pics, nothing like the sight of the sun glinting on expensive metal ;D I was in the team that came first in UKSMG World Six Metre Contest in the early 90's - great fun, ended up completely hoarse after 24 hours....
I cannot boast much metal in the sky at home, but I am a member of a club that can boast about its antenna set up. I operate from there several times a year, so if you hear a strangely english accent calling CQ from RM3M on 20 with an ear shattering signal - give me a shout!
http://translate.googleusercontent.com/translate_c?hl=en&sl=auto&tl=en&u=http://rk3mwd.ystu.ru/na%2520kryshe.htm&rurl=translate.google.com&usg=ALkJrhhT2qs2H_sxGfdaorV5mwwCVqBY9g
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Still no advice on this. Noise sounds like a helicopter (SWAT), and is present when engine is switched off as well as on.
Tried vx-8, e90, 817, 987.None connected to the car power.
Tried various antennas.
Any clues? >:(
Lowely 2e0
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OK. time to start narrowing things down then.
Is the noise there regardless of whether the radio is powered from the car or its' own internal batteries?
Is it there on a handheld radio with its' own antenna or just an antenna mounted on the vehicle?
If so, can you narrow it down by checking around the car with a handheld to see where it's strongest?
Can you power down circuits on the vehicle until the noise stops? First try it with the ignition key removed. If the noise is still there try pulling fuses until you find the offending circuit. Beware that you'll need a valid code for the head unit if you remove power from it.
Let us know what you find and we'll take it from there.
Kevin
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G7 in my case. ::)
Old git :P
Think that makes me an older git then, G8P**, although not used it for a long while, guess that's what happens when you choose a career in Radio and Telecoms for the last 25 years. ;)
Makes me an even older git then G8O** - stopped for same reasons + discovered females @ the same time my chums were playing with their Westmisters ::)