27MHz noise
Submitted: Sunday, Aug 10, 2003 at 18:44
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Parso
I've installed a GME TX835 27MHZ radio in my new Toyota L/C T/D.
Works fine when the engine is not running, however, when at 1500 plus RPM an incredible noise comes thro and the squelch has to go right up.
Power is via an extra heavy duty cable to a fuse box, then to the radio.
Earth is to the body.
Is anyone able to assist?
ParsoParso
Reply By: Mixo - Sunday, Aug 10, 2003 at 20:54
Sunday, Aug 10, 2003 at 20:54
If you search for some posts on HF in this
forum you should get plenty of clues. There has been a lot of comment.
Far as I know you are in deep cack...my Jack has it bad but Toj is reputed to be worse...the electronic circuits and wheelygigs running your donk are putting out lots of strong HF interference. Apparently the car makers don't care. Too hard to cure, so they just make out they don't know. Some of the new EFI's
are the same. Many long distance HF users (same band as your CB) have to stop and turn off before using the radios these days.If you have a UHF it should be un-affected - different technology.Gotta have red sand on those boots !
AnswerID:
27379
Reply By: Member - Bigbear - Sunday, Aug 10, 2003 at 21:44
Sunday, Aug 10, 2003 at 21:44
Hi Parso
Had a similar problem just recently on my mates Rangie. We tried all sorts of things and it seemed to come down to two things.
1 The radio was not adequately earthed
2 The source battery was not fully charged- This was a real surprise as he had the battery on the charger for some time before we tried. Only after recharging the battery for several hours were we able to get rid of the pulsating noise.
Dunno if you have tried these
CheersBush Bappo's 4WD Club
Get out there & have a look
AnswerID:
27389
Reply By: stillthinkinaboutit - Monday, Aug 11, 2003 at 18:20
Monday, Aug 11, 2003 at 18:20
Not sure where you have your antenna mounted, but if it is on the bull bar it is worth checking that the bar is in fact earthed.
On my GU Patrol the bar is bolted to the chassis rails but there are no earth straps from anywhere on the chassis to the engine block, battery or bodywork.
The only earth is through the fuel guage sender unit and the body mounts.
You may need to add an earth strap from the bar to the engine block or chassis.
Regards, Mark
AnswerID:
27472
Reply By: Eric - Monday, Aug 11, 2003 at 22:25
Monday, Aug 11, 2003 at 22:25
Parso.
THe noise can be from the antena or the alternator, to find out place a spare battery on the floor of the car and run the radio of that if the niose goes away run the positive lead directly to the battery terminal preferably runing the wire
well away from the alternator. if the niose is still there redo your coax to the antenna also keep it
well away from the alternator, consider running the coax under the mudgaurd to aviod the engine compartment. Eric.
AnswerID:
27525