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Old 06-24-2014, 7:56 PM
phask phask is offline
Join Date: Dec 2002
Location: KZZV - SE Ohio
Posts: 2,746

Originally Posted by KB3WIR View Post
Okay, I have going to the extent of what I can do with this and figured I would post it here to see what you all have to say. I have a 1993 Jeep Wrangler YJ 2.5l, I have a scanner and 80 and a 2 meter rig in it. I've had the same radio and scanner in all three vehicles I've ever owned, and never had a problem with alternator noise until now. When the vehicle is off, it's the clearest radio I've ever heard, as soon as I start the jeep I get a little bit of wine from the radio, once I start driving it's almost unbearable. I've tried everything that I can think of including talking to good friends of mine to do installs for a living. I currently have a DC filter in line in the cab, I originally had it in the engine compartment and was told that it was too close to the alternator so I moved it to the inside today, still no help. I have clean power and wired it right to the battery. I've tried everything I can think of and can't figure this one out. The other thing that I figured out is that when I have my high band portable in the vehicle receiving, I still get the same whine as I do on the mobile. Does anyone have a solution to this problem? I originally was leaning towards it being alternator wine or the electrical system, but now I believe I am getting it through the antenna. I don't know how old the alternator is, it might be the original one. I know that when the alternator generates electricity it is originally AC and it is then rectified to DC. My question is, if the rectifier is starting to go bad will it cause extreme alternator noise to be received through the antenna?
I had a 93 - but it was a 4.0. I have no HF hear but had a 2 m and scanners. I do not remember anything that caused issues.

If you think it's via the antenna you should be able to get it with a hand held standing close by. You could also try powering via an external battery.

I've often seen alt. whine in the audio circuit. I used to have some choke/filters etc. that worked, but it's been years. Plus they never would have handled over 10 amps DC. Might find some at one of the high end car audio shops.

I'm assuming you also have it grounded at the battery. Try a choke on the neg. also. In fact sometimes it takes several chokes inline

'luck de N8PFF
SDS-100, BCD536,Hp2(e),HP-1(e)x2, BC780, BCD996t ,BCD996P2, BCD325P2, Pro 2005, 2006(x2), Pro34,VR500,AT803,R5000 and other RF capture devices

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