small crackle in UHF
Submitted: Thursday, Feb 17, 2005 at 17:35
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Member - Crazie (VIC)
Hi All
I have installed my new GME 3400 UHF, but there is a very small crackle in it when driving. It is not present when just the engine is running, but when I am driving. I have hooked up the unit straight from the battery through a relay that is activated by the ignition be turned on. I have it earthed on a bolt inside the cabin on the firewall.
I just added the relay to try and see if that would make any difference, I first had it set up just hooked into the ignition circuit and noticed the crackle, so i ran the wire straight from the battery.
Any Ideas.
ta
Crazie
Reply By: DeanoNSW - Thursday, Feb 17, 2005 at 19:04
Thursday, Feb 17, 2005 at 19:04
Try earthing both the radio chassis and the antenna base. Just use the flex from some spare coax.
From there you can try getting a RF choke from Jaycar/Dick Smith electronics. This is placed around the positve lead.
If all this fails, try and isolate the source of the RF interference. I am not sure of what sort of vehicle your are running. Could it been an electric motor, perhaps the fan (either engine or heater/airconditionor).
Cheers
AnswerID:
98857
Follow Up By: Member - Crazie (VIC) - Thursday, Feb 17, 2005 at 23:08
Thursday, Feb 17, 2005 at 23:08
I will try to earth the aerial base
cheers
FollowupID:
357295
Reply By: Member - Banjo (SA) - Friday, Feb 18, 2005 at 11:00
Friday, Feb 18, 2005 at 11:00
I get a bit of that in my Jack at times on HF radios - I put it down to a circuit running in the computer - have noticed that when all else is off, there is a current drain still running - I'm no techo, but the computer is digi in operation and so is the
UHF radio ... might be something getting out -
re HF (another story) - have found the Jack to be an interference factory.... all but given up on that issue. I do know that my TX3000 UHF hangs up on channel 35 when scanning because the Barrett HF remote head is too close ! So digi signals come out of that I guess. Whatever - I can only use bush logic !
AnswerID:
98948
Follow Up By: Member - Bradley- Friday, Feb 18, 2005 at 13:34
Friday, Feb 18, 2005 at 13:34
Interference with am and
hf radio ? yep welcome to the world of the 3.0td jack. The prob is that the catterpillar computer in the engine bay runs with an alternating current signal internally, and causes heaps of interference. We used to have one guy bring his in for service, he had extra bonding leads on the bonnet, all antenna bases grounded, even had some nice fine copper mesh wrapped around the ecu and grounded to act as a farraday cage to try and stop it, but he still had some interference.
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357366