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Author Topic: ic 2100h in Chevy s-10 BAD alternator whine...  (Read 512 times)
KD7SRQ
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Posts: 1




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« on: October 19, 2002, 08:13:50 PM »

HELP!!

I'm having no luck in my fix.  I have a 98 chevy s-10 pickup and I just put an Icom 2100h in it.  I have a 5/8wave roof mount ant. as well.

The + lead is on a fuse block with the lead directly from the battery. (connects to + cable before fuse block)

The - lead is direct to the battery.

I did just replace the alternator, so it should be just fine.  The alternator is grounded with a decent ga. wire directly to the - battery post.

I've tried re-soldering the roof mount to the coax, and replacing the pl-259 on the other end.

I also have a fender mount that has no alt. whine, but when you try to tune the antenna, it has an swr off the scale and doesn't start dropping until about 150MHz or so.

HELP...any suggestions?

Thanks HAMs,

jim, kd7srq
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KD7RQH
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Posts: 24




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« Reply #1 on: October 20, 2002, 12:38:28 AM »

I just fixed my noise issue (unrelated to the alternator), not fun to say the least.  I recently ran across an item with crutchfield (www.crutchfield.com) which filters the noise out of your alternator.  I don't know if it works or not, but it might be worth a try...
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K0BG
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« Reply #2 on: October 20, 2002, 09:30:12 AM »

Borrow an O-scope if you don't have one, and look at the output wave form. Don't assume you're "new" alternator is good, especially if it was a rebuilt one. If the ripple is caused by a bad or leaky diode(s), a brute-force filter won't even quiet it down.

Alan, KØBG
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AB0RE
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Posts: 293




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« Reply #3 on: October 20, 2002, 06:54:33 PM »

I have owned many 2100's in the past and they are quite vulnerable to vehicle-created noise.  The best solution I found was to wire a Radio Shack 10-amp noise filter (part # 270-051 @ $15) in series with the power cord.  If I recall, moving the ground wire from the battery to another chassis ground helped a bit, too.  Oh, and don't worry about the 10-amp noise filter not being big enough - the rig only draws about 9.5 amps on high power TX.   73 - Dan
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W8AII
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Posts: 25




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« Reply #4 on: October 30, 2002, 12:53:44 PM »

Are you 100% sure that it is the alternator causing your RFI problem and not the electric in-tank fuel pump???

Does the whine change with increase or decrease in engine RPM? or is it a constant unchanging pitch? If the noise is constant, it is most likely your fuel pump... These pumps have been the RFI culprits on more than one rig installation...

Good luck...  73's  de Al / W8AII
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K8JSL
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« Reply #5 on: November 02, 2002, 06:38:00 PM »

Had the same problem in my S-10 Blazer. Add another ground as close as possible to the radio, and disregard the ground from the battery. It solved my "whine" problem.......

Jeff K8JSL
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