UHF interference

Submitted: Tuesday, Oct 21, 2003 at 21:15
ThreadID: 7991 Views:1319 Replies:3 FollowUps:3
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Hi All,

I have a GME UHF in my 99 petrol hilux that is wired directly to the battery. Problem is when I transmit it seems to cut the vehicles am/fm radio out with some form of interference. The unit has been in the vehicle since I bought it new in '99 and have had no probs up to this point. Anyone got any ideas??

Shaun
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Reply By: Brendon - Tuesday, Oct 21, 2003 at 22:29

Tuesday, Oct 21, 2003 at 22:29
Might be worth making sure both radio's have a good earth. check to make sure the connections on the antenna cables are OK. If the antenna has been shifted lately, you may need to play with location. This is only basic stuff. Plenty of better experts than me out there. Local radio suppliers/fitters have seen it all before. Give one a call and have a chat. Good luck
AnswerID: 34658

Follow Up By: Member - Bob - Wednesday, Oct 22, 2003 at 11:43

Wednesday, Oct 22, 2003 at 11:43
I agree. Check the connection between the shielding braid and the base of the UHF antenna. Often it is only a small clamp that makes the connection and it is very prone to corrosion.Bob
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FollowupID: 25053

Reply By: chrisfrd - Wednesday, Oct 22, 2003 at 16:50

Wednesday, Oct 22, 2003 at 16:50
Hi there Shaun!

Explain the I/F. Is it only doing it when the car is running? Is it a buzzing noise? If it is a high frequency buzzing noise, then you are getting bleed-through from a stuffed ground plane on the RF cable. Replace the cable if this is happening as it could be that the shield is open-circuit or touching the body.

Typically, I shun wiring direct to the battery. it's messy (potentially DANGEROUS!) and not required. This is because you normally have many accessories that are to be wired-up to the truck and typically these end up in a bloody mess. Get it sorted out properly (don't rely on auto-electricians, as most of them are bleep -house) and distribute the power through the truck correctly..

My Patrol has only the main power feeds to/from the battery and management system. It then flows into a 140A resettable 12V breaker (lower-drop than fuses!) then down through some 130A Welders cable to a distribution block at the back, from there, a fuse system distributes the power throughout the truck.

AnswerID: 34722

Follow Up By: Shaun - Wednesday, Oct 22, 2003 at 21:54

Wednesday, Oct 22, 2003 at 21:54
Thanks heaps. I will check it all out, and yes, the interference is a very high pitched buzzing.

Shaun
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FollowupID: 25101

Reply By: fj45ute - Friday, Oct 24, 2003 at 16:52

Friday, Oct 24, 2003 at 16:52
Where are the mynah bird traps Shaun?

Cheers Matt
AnswerID: 35000

Follow Up By: Shaun - Friday, Oct 24, 2003 at 21:05

Friday, Oct 24, 2003 at 21:05
You had me thinking Matt.

Shaun
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FollowupID: 25315

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