LQ / FOR-22 to Motorola APX 7500
Here is an untested pinout for connecting to the APX:
Headset 1 J11 and/or Headset 2 J12 (DB9 to RJ45)
APX 7500 J11/J12 Pin | Purpose | LQ Pin | LQ Purpose |
|---|---|---|---|
2 | Headset Detect | Short to APX pin 8 | Active Low - tying to ground |
3 | Speaker - | 2 | Audio In - |
4 | Microphone - | 1 | Audio Out - |
5 | Microphone + | 6 | Audio Out + |
6 | PTT | 5 | Relay Normally Open |
7 | Speaker + | 7 | Audio In + |
8 | Ground | 9 | Relay Common / Wiper |
Crosspatch J24 (DB9 to RJ45)
APX 7500 J24 Pin | Purpose | LQ Pin | LQ Purpose |
|---|---|---|---|
1 | Receive Audio | 2 | Audio In + |
2 | Channel Activity | 3 | Logic Input |
3 | Ground | 6,7, 9 | Output and Input Ground, plus Relay Common / Wiper |
7 | PTT | 5 | Relay Normally Open |
8 |
| 1 | Audio Out + |
Accessory 1 J104 (DB25):
URC-200 J2 Pin | Purpose | LQ Pin | LQ Purpose |
|---|---|---|---|
2 | Ground | 6, 7, 9 | Output and Input Ground, plus Relay Common / Wiper |
4 | RX Audio | 2 | Audio In + |
10 | PTT | 5 | Relay Normally Open |
17 | TX Audio | 1 | Audio Out + |
25 | Channel Active | 3 | GPI / COR |
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