RX PL Enable M1225

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Ra
Posts: 38
Joined: Mon Jul 08, 2002 7:57 am

RX PL Enable M1225

Post by Ra »

I noticed that the mic back needs a short, via mic hang up clip, to enable rx PL and scan, etc. Is this addressable via software? Will programming the unit as a "handset" allow the rx to stay in the PL enabled mode all the time?

Cheers
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HumHead
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Joined: Tue Sep 25, 2001 4:00 pm

Post by HumHead »

My favorite way around that "feature" is to open up the mic, unsolder the wire from the hang up button, and reattach it to the unused normally closed terminal of the PTT switch.

On most of the mics, the common terminal of the PTT switch goes to ground, and the normally open side has the PTT line.

With this arrangement, the monitor line stays grounded through the switch, as long as the PTT button isn't pressed. Since the switch is break-before-make, you can partially depress the PTT (opening the monitor side, but not closing the PTT side) to monitor the channel prior to transmission (The whole legal basis for the HUB monitor feature in the first place).

When you fully depress the PTT, you lift the monitor line and key the PTT. As a result, this particular modification works like a charm on radios that are designed not to transmit unless they are in monitor mode.

PLEASE NOTE: This modification depends on the following:
1) The radio uses a ground to determine monitor status, and to key PTT.
2) The PTT sitch is double throw with a spare normally closed circuit.

THE DISCLAIMER: While this modification has worked like a charm for me, I can't speak specifically about your radio, microphone, or soldering abilities. Use with care and at your own risk.

Good luck! :)
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Ra
Posts: 38
Joined: Mon Jul 08, 2002 7:57 am

Thanks Dear Hum!

Post by Ra »

P E R F E C T - Just what I needed to hear - soldering is old habit as is opening old Mic's.

Going to bench as we speak!!

Cheers!

Ra
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