One frequency bleeding over another?

[saleen49]

I have an odd situation with my feed radios. I am using two different radios on one stereo feed. I am experiencing a control channel like sound which is the result of one frequency bleeding onto another from radio to radio. I tried swapping out a radio but still have this problem. Where to start???

Chicago Heights, Steger and Crete Public Safety Live Audio Feed

[ST-Bob]

First would be to isolate the ground connections between the two scanners by inserting audio isolation transformers (ground loop eliminators) in the external speaker to computer cables. This will eliminate any potential difference in ground potential between the two scanners and the sound card. The negative side of the external speaker jack on some devices is not at ground potential. In some scanners both the tip and ring are driven in opposite polarity to increase the audio power. Grounding the negative side by sharing a common connection to another scanner will often cause problems.

[DigitalMDX]

I run a stereo feed and had some bleed over between radios.
There were several things that were causing it.

1) I was sharing an antenna between the two scanners using a splitter made for just that purpose. I bought a second antenna.
2) My sound card had some "bonus" settings I had to turn off. 3D sound along with other enhancements. I turned them all off.
3) The sound mode on the card made a difference. Game mode vs theater mode, etc. I chose the one that stated it was best for voice or spoken word as opposed to music.

With all that I have good separation. Different devices will give you different results. My PC gives me total separation where my phone isn't so clear on the separation unless I drop one of the balance controls all the way down.

Jay

[saleen49]

I recently realized 154.370 will bleed over 154.235 even with both frequencies programmed on the same radio. I am in fact sharing one antenna to two radios. I've been running this set up for a few years without incident. This problem just popped up a few weeks ago. I will try to seperate the two with independent antennas as soon as i can get around to it.

Thanks for the help.