I have a low-frequency 'hum' in the background of my feed, only audible when there is no radio traffic. The scanner does not have this hum if it is unplugged from the cable. My guess is that the cable is picking up interference?? I thought it was a shielded cable. Has anyone else had this problem? Any suggestions? Thanks!
Low audio hum in feed
- Thread starter h00sierdaddy
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It sounds like my situation, I dont have a feed, but I do feed my scanner into my PC for other purposes...I read in another post that the noise might be caused by a ground loop or something like that.
I took a ground wire that leads back to my ground spike, put a Ring Terminal on the radio end, and then fed the audio cable plug thru the ring terminal, and then plugged it in... it clears up all noise, humm or however you would describe it..mind you I'm not sure this is the proper way to do this, but it works great as far as I can tell.
Maybe the pro's on here can tell us why this works...
I took a ground wire that leads back to my ground spike, put a Ring Terminal on the radio end, and then fed the audio cable plug thru the ring terminal, and then plugged it in... it clears up all noise, humm or however you would describe it..mind you I'm not sure this is the proper way to do this, but it works great as far as I can tell.
Maybe the pro's on here can tell us why this works...
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LordJ
Member
google 'ground loop isolator'
OhioX
Member
you can buy a ground loop isolator on ebay pretty cheap...
ka3jjz
Wiki Admin Emeritus
Check out the 4th question in the FAQ below - there are links for an isolator there, too..
Uniden DMA FAQ Page 2 - The RadioReference Wiki
73 Mike
Uniden DMA FAQ Page 2 - The RadioReference Wiki
73 Mike
Thanks everyone! I've ordered one and will report back with the results! Thanks again!
Scan-Denver
Member
Quick question for you, are you using "Mic In" or "Line In" on your sound card? Using the "Mic In" will produce the same results because of an impedance mis-match.
I am using a usb 2.0 sound card adapter. It only has a 'mic in' and 'speaker out' on it
Scan-Denver
Member
Well since you've already ordered the ground loop isolator, give it a try when you get it.
If that doesn't work, you'll either have to live with the hum or get a different sound card either internal or external that has a "Line In" jack.
If that doesn't work, you'll either have to live with the hum or get a different sound card either internal or external that has a "Line In" jack.
what is the difference between 'line in' and 'mic in' ?
Scan-Denver
Member
"Mic" is for use with microphones only.
"Line In" is for use with external audio sources such as "Scanners", "iPods", "MP3 Players", etc, etc.
"Line In" is for use with external audio sources such as "Scanners", "iPods", "MP3 Players", etc, etc.
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