Motorola GM340

GM340 on Motorolan mobiiliradio, joka soveltuu hyvin myös datakäyttöön.

Takana olevan liittimen pinout:

3) PTT, vedetään maihin => TX ON (violetti)
5) FSK IN (valkoinen)
13) DC 12V OUT (punainen)
7) GND

Kaikille GM3xx malleille:

1)  speaker -
2)  external mic
3)  digital in 1 (ext.PTT use external mic/data PTT use flat Tx audio)
4)  digital out 2 (external alarm)
5)  flat Tx audio, sensitivity 150mV rms to 60% deviation
6)  digital in 3
7)  ground
8)  digital in/out 4
9)  digital in 5 with wakeup (emergency)
10) digital in 6 with wakeup (ignition)
11) flat/filtered Rx audio
12) digital in/out 7
13) switched battery voltage (max.1A,dropout voltage max. 1V)
14) digital in/out8
15) RSSI (radio signal strength indicator)
16) speaker +
17) BUS + (used for CFPS and Flash)
18) BOOT control
19) reserved
20) reserved

and position of pins goes:

upper pins from left to right: 20,2 4,6,8,10,12,14,16,18
bottom  pins from left to right : 19,1,3,5,7,9,11,13,15,17,

FSK sisään POCSAG-käytössä 100 mV peak-to-peak.