I want to use a NSN6027A with a handheld scanner (BC125AT) as my sole mobile equipment. It works and has plenty of volume (blows you out of the car at max) but I have a ground loop problem. The antenna is a 1/4 VHF spike on a trunk-lip mount, and the hum/whine gets worse when I connect the antenna to the scanner. I notice changes in the noise when I open and close the trunk lid, so it's pretty obvious.
For what it's worth, for the DC power, I'm using a cigarette lighter plug (don't judge me...) The AF input is just a simple cord with a 1/8 mono plug. I knew before I even turned on the ignition that I would get a ground loop, because I had just one of the AF wires hooked up and was getting audio. It must be through the antenna, because when I disconnect the BNC, the noise is reduced. I tried using a mag mount -- it reduced the hum/whine, but it also cut the audio output in half.
What can I do to eliminate, or, at the very least, reduce the noise? What am I doing wrong?
Would bonding straps on the trunk lid do any good?
Must I resort to using expensive chokes or suppressors? That's not something I really want to do because the whole idea of this $60 scanner/$20 speaker was to keep costs down and keep things simple.
I realize that these speakers weren't designed to be used with handheld scanners, but I used one with mobile scanner for years and didn't have any ground loop issues.
For what it's worth, for the DC power, I'm using a cigarette lighter plug (don't judge me...) The AF input is just a simple cord with a 1/8 mono plug. I knew before I even turned on the ignition that I would get a ground loop, because I had just one of the AF wires hooked up and was getting audio. It must be through the antenna, because when I disconnect the BNC, the noise is reduced. I tried using a mag mount -- it reduced the hum/whine, but it also cut the audio output in half.
What can I do to eliminate, or, at the very least, reduce the noise? What am I doing wrong?
Would bonding straps on the trunk lid do any good?
Must I resort to using expensive chokes or suppressors? That's not something I really want to do because the whole idea of this $60 scanner/$20 speaker was to keep costs down and keep things simple.
I realize that these speakers weren't designed to be used with handheld scanners, but I used one with mobile scanner for years and didn't have any ground loop issues.
