[Mobile-Portable] Alternator(?) Noise on Ford F250 w/ 6.0 Diesel

[Dick Flanagan]

At 08:03 AM 8/4/2004, you wrote:
 >I am getting reports of apparent alternator hum(?)
 >on my 2m rig.  Does anybody have any specific
 >experience or recommendation?  I ran 12 (maybe
 >14) gauge wires directly to the battery.

Go to Radio Shack and get a 10-amp "whine filter."  They are usually 
encapsulated modules that go in the primary DC lead at the back of your 
radio.  Typically your battery acts as a big capacitor and filters out this 
kind of whine, but sometimes it needs a little help.  You're looking for a 
low-pass filter because that whine is audio being impressed on your DC 
power source and you want the DC to get through, but not the low-frequency AC.

Good luck.

73, Dick
--
Dick Flanagan K7VC NV SM
E-mail: k7vc at arrl.org