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Reducing Feedback from RSMs

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fatherpierce

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Does anyone know what the best way to reduce feedback when using multiple radios with RSMs in close quarters, specifically for firefighting? Is there a good hardware or software solution? We use HT1250s and it is a real problem.
 

NorCalrescue

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Does anyone know what the best way to reduce feedback when using multiple radios with RSMs in close quarters, specifically for firefighting? Is there a good hardware or software solution? We use HT1250s and it is a real problem.
Go into the external mic settings in the CPS. Reduce the gain to between -3 and -12 and experiment what setting works best for you. I have ours set all at -3. Also you can reduce your treble settings. That seems to help. Turn off AGC.

Hope that helps. It worked for us. There's a great video tutorial on MOL also.
 

com501

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HT1250 settings, factory default is 28.5 and 25.5

Set those to somewhere around 21.0 for both internal mike and RSM. Start there, try that, and reduce from there. It may require that you train your users to actually speak INTO the microphone.

There are also some newer speaker mikes that employ WindPort technology for noise cancelling. Check with your dealer.
 

rjk_165

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This tends to be an issue when inside vehicles... Especially in the fire service from what I understand.

When you have a truck loaded with about 5 guys with speaker mics with the volume jacked up and a big mobile radio speaker it tends to cause a lot of issues.
 

com501

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This tends to be an issue when inside vehicles... Especially in the fire service from what I understand.

When you have a truck loaded with about 5 guys with speaker mics with the volume jacked up and a big mobile radio speaker it tends to cause a lot of issues.
Everyone in the apparatus should be on headset. Every handheld should be off until arrival on scene. The operator and front seat passenger should be the only ones operating the radio, and they should both be using noise cancelling headsets.

Inside the cab there should be no feedback. If there is, train the crew.
 

kb2ztx

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Everyone in the apparatus should be on headset. Every handheld should be off until arrival on scene. The operator and front seat passenger should be the only ones operating the radio, and they should both be using noise cancelling headsets.

Inside the cab there should be no feedback. If there is, train the crew.
I wish that was the case. Training cannot help our department cuase not one of our trucks have headsets....to think about it i dont knwo of a FD in my county that has headsets in the trucks. Not saying they shouldn't but our limited funds do not pay for that stuff....
 

sfd119

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None of our departments in multiple counties have headsets. Comes down to funding.
 

com501

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Wow. I have to get out more. Every podunk fire department out west has headsets. Its all grant money.
 

sfd119

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Yeah, even some of our career depts don't. I know there's at least 5 counties I can think of off the top of my head that no fire depts have them.
 
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