• To anyone looking to acquire commercial radio programming software:

    Please do not make requests for copies of radio programming software which is sold (or was sold) by the manufacturer for any monetary value. All requests will be deleted and a forum infraction issued. Making a request such as this is attempting to engage in software piracy and this forum cannot be involved or associated with this activity. The same goes for any private transaction via Private Message. Even if you attempt to engage in this activity in PM's we will still enforce the forum rules. Your PM's are not private and the administration has the right to read them if there's a hint to criminal activity.

    If you are having trouble legally obtaining software please state so. We do not want any hurt feelings when your vague post is mistaken for a free request. It is YOUR responsibility to properly word your request.

    To obtain Motorola software see the Sticky in the Motorola forum.

    The various other vendors often permit their dealers to sell the software online (i.e., Kenwood). Please use Google or some other search engine to find a dealer that sells the software. Typically each series or individual radio requires its own software package. Often the Kenwood software is less than $100 so don't be a cheapskate; just purchase it.

    For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).

    This is a large and very visible forum. We cannot jeopardize the ability to provide the RadioReference services by allowing this activity to occur. Please respect this.

APX 2500 David Clark

Joined
Feb 11, 2025
Messages
3
Reaction score
0
Hello, I am looking for the Pin out diagram of a Motorola APX 2500 20 Pin. I'm having issues finding a 20 pin map. This will be hooked into a David And Clark headset system so that setup map would be helpful also.
 

kf8yk

Member
Joined
May 3, 2003
Messages
862
Reaction score
554
For the David Clark C3821 generic radio interface cord:

Red Mic High - XPR Pin 2
Yellow PTT High - XPR Pin 3
Green Audio High - XPR Pin 11

Blue PTT Low - XPR Pin 7
Black Audio Low - XPR Pin 7
White Mic Low - XPR Pin 7
Shield - XPR Pin 7
 

kf8yk

Member
Joined
May 3, 2003
Messages
862
Reaction score
554
I should note that this provides a fixed receive level to the headset system, if you want the receive audio to follow the volume control or if the audio level is insufficient then connect the Audio High & Low wires across the radio speaker:

Green Audio High - XPR Pin 16
Black Audio Low - XPR Pin 1

The audio high/low inputs are transformer isolated so no concerns about the bridged audio amplifier in the radio.
 
Top