InterceptRadio.com Forums

Seems officers reply to dispatch way too quickly to be picking up a mike and pressing the key. What are they using these days? Is there a mike button on the steering wheel? Many years ago a department I volunteered with experimented with foot switches for the transmit button, but there were too many embarrassing "open mike" incidents.

mic gain and AGC.

When set properly, the user will sound the same whether the mic is keyed next to his mouth, in his lap, or still on the mic clip..

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Oh! Come and see the violence inherent in the system! Help, help, I'm being repressed!

Proper training and appropriate beating of users when they don't listen!

AGC has no place in a cop car- especially when they have a siren.


Key up time (the time when the user keys the mike and when the audio finally makes it out the "repeater) varies system by system. Audio into a conventional repeated system can take up to a half second to start coming out the transmitter. Trunking sometimes longer. But since dispatch is usually connected directly to site receivers their rx audio happens pretty much Instantly.

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"A well regulated breakfast, being necessary to the healthy start of the day, the right of the people to keep and eat food shall not be infringed."

Depends on what ver DSP you're running. I agree, older DSP sucked, hard.

Newer DSP can have you in FRONT of the siren, and make it sound like it's barely there.

As I said 'when set properly'...

Otherwise, I'd agree with you. When set improperly, it can make the audio 10x worse.

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Oh! Come and see the violence inherent in the system! Help, help, I'm being repressed!

Motorola used to believe in the KISS concept. (keep it simple stupid)

To me- its kinda like putting someone on autopilot for their whole career. When they need to really fly they don't know how. Im not seeing real radio techs come out of any of the schools anymore. Anyone here under 40 tell me how a SuperHetrodyne receiver works?

In my case- our guys are not talking into $5000.00 radios. What happens when someone from an agency with all the gadgets comes over to take a new job? Users just want to push the button and talk. But they still need to know some basics.

To me DSP and AGC are not the same thing. Our voters use a DSP circuit but do not adjust audio levels unless we set a separate AGC function. I will admit though that our dispatch consoles do use AGC.

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"A well regulated breakfast, being necessary to the healthy start of the day, the right of the people to keep and eat food shall not be infringed."

How to use a microphone properly :D

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" SILENCE IS CONSENT "

Jim N7UAP - Bellingham, WA / InterceptRadio.com

things changed after the 50's

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"I was installing un-programmed radios"