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Motorola XPR 4550 desktop microphone button?

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SamAltenberger

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Hello! I work in the security department at a university campus. We use a MotoTrbo digital VHS trunked radio system for communication with our field officers. Officers in the field use Motorola XPR 6350 radios and I use a Motorola XPR 4550 base-station radio with a Motorola RMN5050 Desktop Microphone.

My question is: The RMN5050 microphone I'm using for the radio has two buttons on it. The right-side "lightning bolt" button is the PTT button to transmit, but I can't figure out what the left-side "speaker icon" button does. When I try to push it, nothing appears to happen.

Does anybody know what the purpose of the left-side "speaker icon" button is? Thanks!

See below for an image of the Motorola RMN5050 microphone I'm using:

rmn5050a_lg.jpg
 

Mtnrider

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Its to monitor the channel/Frequency PRIOR to transmitting....as required by law....although today the way radios are programmed its kinda moot
 

SCPD

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On an FM radio that has the tone programmed on the receive side, this button will open up the receive so you can hear anyone out there talking, regardless of the tone they are transmitting. Used so you don't talk over someone on the radio. Seeing y'all are running XPR's, it's safe to assume your radios are programmed digital, so like Mtnrider says, it does nothing.
 

KG4INW

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If you open up that mic (by removing the screws on the bottom plate), you'll see a number of switches. If you're holding the mic upside down with the cord facing away from you, flip the third switch from the left to the opposite position from how it is now. You'll now have PTT on both buttons.
 

CreteIT

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If you open up that mic (by removing the screws on the bottom plate), you'll see a number of switches. If you're holding the mic upside down with the cord facing away from you, flip the third switch from the left to the opposite position from how it is now. You'll now have PTT on both buttons.

I know I'm pulling a post from the past, however do any of you know if those PTT buttons can we set to transmit on two different Channels?
Thanks and let me know.
Crete IT
 

KG4INW

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No, that's not a capability of this microphone or any other model. One PTT signal on one channel at a time.
 
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