Stikman 2 posts Jun 28, 2008 1:25 AM	Hello guys, Ever since i removed my XM radio system from my car i get a whining noise from my CB. It only happens when i crank up my car. If i push the gas pedal the whining will briefly drop in frequency and will go back up in freq and stay there. When in TX or RX the noise is not heard. I disconnected the coax from the radio while it was running and the noise went away. I`ve been told by some that it is an antenna ground issue and by others that it is alternator whine. A local friend of mine suggested that i put a hot line filter between the battery and my radio on the positive line. I found a filter at a local electronics store.that is rated at 10 amps. Is this good enough or am i going in the wrong direction. I wanted to ask you guys before i start cutting into power lines and possibly messing up my system with a $8.00 filter. Any input and guidance will be greatly appreciated. THANKS
Anonymous Guest Jun 28, 2008 6:59 AM	Your alternator may be the problem. Shorted diode.
Butcher318 226 posts Jul 01, 2008 6:17 AM	A filter is worth a try, as long as your radio draws less then 10 amps your ok with the filter you referred to. Any of these will work great. http://www.sparkyscbshack.com/filters.html Magnum makes a darn good in-line filter as well. In the end though if the filter does not get it all then you know it's in your alternator.
Anonymous Guest Aug 17, 2008 4:25 PM	My GMC Sonoma had a similar problem. I found that after installing a line filter the problem remained; I even went as far as adding a ground strap to my alternator and the block and frame. A lightning arrester in the ant. line will filter a little of it out, but in the long run you will end up doing some alternator work. turns out my alternator was going out anyways; it could not keep up the proper voltage. I verified the alternator by removing the exciter voltage from it---the little plug off to the side of the rear case. after removing the plug and running the truck off of batt the noise was gone......sorry about the length of the post Steve
Bob_P 4 posts Aug 18, 2008 8:27 AM	Has anyone tried one of these filters? Paradynamics Noise Chopper Filter Last Edited on 18-Aug-2008 8:28 AM
Granite Crusher Guest Aug 22, 2008 3:15 PM	I have one of those noise choppers in my mobile it works but maybe a little to much, you have to crank the volume all the way up and your squelch off and RF gain all the way up to make out weak signals. it cuts out the engine noise but it can block weak and incoming signals as well. it works enough for me having it switched off and the signals are still amplified enough to make out. i took it apart to see what makes it tick it's a few resistors and diodes soldered to the switch, less than $3 in parts.
Big Bopper 356 posts Aug 23, 2008 10:42 AM	noise chop filter generally is too much, they also cut down on your receive ---------- Competition rig: COBRA Blk Chrome 29 SSB rig: 2950DX SSB Rig: on base Magnum 257 Base radio: Lafayette 1140 Secret......all by Sparky's Too many more radios to list bopper1_98@yahoo.com
Sandman 143 posts Sep 01, 2008 8:26 PM	First you need to determine if the noise is coming through the antenna or the power wires. If it is coming through the power, a power filter usually does the trick. The antenna is a whole different game.