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Author Topic: Interference on portable tranceivers  (Read 7643 times)

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Thatcher

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Interference on portable tranceivers
« on: 13 August 2010, 16:41:27 »
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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Kevin Wood

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Re: Interference on portable tranceivers
« Reply #1 on: 13 August 2010, 16:43:47 »
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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Sixstring

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Re: Interference on portable tranceivers
« Reply #2 on: 13 August 2010, 17:55:55 »
Don't get any interference on my 2m Yeasu, is it at any particular speed?
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Omegafantasy

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Re: Interference on portable tranceivers
« Reply #3 on: 13 August 2010, 18:03:32 »
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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Kevin Wood

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Re: Interference on portable tranceivers
« Reply #4 on: 13 August 2010, 22:41:59 »
Quote
Anyway, I reckon you're a ham then?  ;D

Oh, no. Looks like there's several of us. ;)

Kevin
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Omegafantasy

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Re: Interference on portable tranceivers
« Reply #5 on: 13 August 2010, 22:47:44 »
Hehe, yeah :)
Better set up some kind of OOF sked then? 80m is fine to UK usually.
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1991 Omega 3000-24v (major rust job)
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Kevin Wood

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Re: Interference on portable tranceivers
« Reply #6 on: 13 August 2010, 23:23:15 »
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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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Sixstring

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Re: Interference on portable tranceivers
« Reply #7 on: 14 August 2010, 17:35:22 »
G1 or G8????

(that'll make a few people wonder what we are on about!!)
« Last Edit: 15 August 2010, 01:35:51 by Kevin_Wood »
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Kevin Wood

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Re: Interference on portable tranceivers
« Reply #8 on: 15 August 2010, 01:36:11 »
G7 in my case. ::)
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Omegafantasy

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Re: Interference on portable tranceivers
« Reply #9 on: 15 August 2010, 02:20:23 »
Not a G at all here, I am an LA :)
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Ken T

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Re: Interference on portable tranceivers
« Reply #10 on: 15 August 2010, 09:00:59 »
I'm an M1.

The rig hasn't been on for a while, so much else to do.

Ken
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TheBoy

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Re: Interference on portable tranceivers
« Reply #11 on: 15 August 2010, 10:00:14 »
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G7 in my case. ::)
Old git :P
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zirk

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Re: Interference on portable tranceivers
« Reply #12 on: 15 August 2010, 13:58:22 »
Quote
Quote
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.  ;)
« Last Edit: 15 August 2010, 13:59:36 by zirk »
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steve_daly

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Re: Interference on portable tranceivers
« Reply #13 on: 15 August 2010, 18:11:25 »
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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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Radiomarko

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Re: Interference on portable tranceivers
« Reply #14 on: 19 August 2010, 17:13:51 »
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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