7 wires are present on the DB-25 connector and hook up as follows:
Pin 2 ------ Black --- 12VDC -
Pin 3 ------ Brown -- 12VDC -
Pin 5 ------ Green -- 12VDC+
Pin 11 ---- Red ----- 12VDC+
Pin 20 ---- White --- Audio IN
Pin 21 ---- Blue ----- Audio IN
Pin 24 ---- Orange --12VDC+
The Motorola spec sheet/schematic confirms the presence of a current limiting resistor for the Squelch (Pin 5 Green), so 12VDC+ works fine. You could hook the green lead to switched power, which would turn the internal amplifier in the speaker on & off accordingly.
In it's designed use with the Convertacom, the vehicle unit provided a +DC voltage to the amplified speaker's green (squelch) lead so it would automatically turn the speaker amplifier on & off based on audio breaking squelch. So if you can find a +DC voltage in your radio that is present when squelch is broken, or perhaps only when the radio is on, (supplying same to the speaker's green lead) it'd be a power saver feature and the internal amp in the speaker wouldn't be on all the time.
Posted by K8PBX 07-18-2006, 05:49 PM
This is amazing I did a google search for nsn6054a, second link brought me back here 2 years ago, simpley amazing what google can do! Try it sometime. How about a pdf that includes a
schematic
Here is
another with a hook up to a plug for a scanner etc.