Harris p7200 Public Safety Speaker Mic

[LowderK]

Ok here is my question If I attach a straight cord PS Speaker Mic that has the antenna on it but don't place an antenna on the mic will it still use the Antenna on the Radio itself ..??? I'm wanting the straight cord for work but not the antenna on the mic because the radio is VHF

 

[Monkey1911]

I haven't seen any option to change in RPM to choose where the RF goes... so I think as soon as you attach the PS RSM the RF will go out the side connection.

 

[Asunakiyori]

In my experience with mother M and PS mics with antennas. It might be in the FW to disconnect the primary antenna for use on accessory (with the option) attach and use the Speaker mics I could be wrong. Someone please correct me if I am

 

[BMDaug]

I haven’t seen anything in the software or in the radio menu, but it could be that a certain pin in the UDC is shorted or carries a particular resistance when a speaker mic includes an antenna jack. This is how the radio knows a Keyload cable is present instead of a standard programming cable. Macom/Harris really likes using resistance across UDC pins to tell the radio what is attached.

Or there’s just a tee in the radio and whatever connection has a resonant antenna is where the current flows… if that’s the case and there is no actual switching, you could just clip the center conductor out of the speaker mic side of the UDC antenna connection. That’s basically what they do with non-antenna models… there’s a metal cap in place that just touches the ground side, with no center conductor. This also leads me to believe that there is either no logic and it’s ’find the resonance’, or the logic is in the UDC.

-B

 

[smackdaddy]

On the P7200, the RF component of the UDC connector is a physical RF switch. When you connect a public safety speaker mic, it presses in the switch, disconnecting the antenna on the body of the radio and diverting the RF path up the speaker mic. Remove the mic and this switch pops back into place sending RF to the antenna on the top of the radio again. This can not be changed by firmware.

If you look at the UDC on the public safety speaker mic, you will that the centre conductor is a small brass pin. If you don't want to use the antenna on the top of the mic, you can pull this brass pin out with a pair of needle nose pliers. HOWEVER - this is a permanent decision. You likely can't go back once you pull the pin.