Hum/Buzz sound on Ethernet.

[Syncopations]

Okay, here's my problem. Please listen to my feed to see(hear) what I'm talking about.

Kingsville Police and Fire, Kleberg County Sheriff

That sound started up when I plugged in my Ethernet cable for a better connection. When I was on wireless, the sound wasn't that "harsh." Does anyone know how to fix this sound? I'd prefer using an Ethernet connection over wireless for obvious reasons.

When dispatch or the officers key up, it comes in clear.

My set up is a Jaguar 700p, to an Ericsson speaker mic, using a 2.5mm to 3.5mm jack adapter, then a stereo audio cable from the 3.5mm jack adapter to my laptop running Windows 7. The feed is ProVoice.

Any input/help will be greatly appreciated.

 

[mancow]

Grab an audio isolation transformer. The entire ready to go assembly can be found at RadioShack but they are kind of pricey at $20 or more. You can also buy the raw transformer and wire it between two audio jacks/plugs. Basically you need to isolate the microphone from the voltage riding on the line.

 

[ProScan]

Grab an audio isolation transformer. The entire ready to go assembly can be found at RadioShack but they are kind of pricey at $20 or more. You can also buy the raw transformer and wire it between two audio jacks/plugs. Basically you need to isolate the microphone from the voltage riding on the line.

That's not a 60 cycle hum which is caused by a ground loop so an audio isolation transformer will not eliminate the noise.

 

[Syncopations]

That's not a 60 cycle hum which is caused by a ground loop so an audio isolation transformer will not eliminate the noise.

It started when I plugged in my Ethernet cable. Do you think a mono audio cable would help? Or maybe a shielded one? I would really like to reduce or eliminate that noise. It's weird that the sound is heard only during silence. When there is radio traffic, it goes away.

 

[ProScan]

It started when I plugged in my Ethernet cable. Do you think a mono audio cable would help? Or maybe a shielded one? I would really like to reduce or eliminate that noise. It's weird that the sound is heard only during silence. When there is radio traffic, it goes away.

It could be several things such as a cheap sound card, USB sound card, audio cable, ethernet cable, grounding, NIC card, power supply regulator, etc. It may also be caused by cables running parallel to each other or the proximity of the router to the cables, computer, scanner.

If using a USB sound card then I would start there and then look at the cables and router location.

If using RadioFeed then you can see the noise in terms of audio frequencies using the Spectrum Analyzer and notch out the offending frequency/s.

 

[w2lie]

I suggest using the solution provided by "ProScan". I used Bob's software to successfully remove a hum from one of my feeds by simply studying the Spectrum Analyzer plot and adding the proper Notch Filters via Software.

 

[Syncopations]

I suggest using the solution provided by "ProScan". I used Bob's software to successfully remove a hum from one of my feeds by simply studying the Spectrum Analyzer plot and adding the proper Notch Filters via Software.

I've tried it all. I discovered that the problem is with my battery eliminator, which supplies constant power to the radio. When I removed the eliminator and used a battery pack, the offending noises went away. Kind of sad. I only have 2 batteries for the Jaguar 700p.