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8. Manual PTT switch, S3 on PCB, can be used for PTT in dispatch (direct
connect) operation.
To enable operation of this switch S5 option select control DIP switches have to
be in the following positions:
a. 1 Option select 1 control - Open
b. 2 Option select 2 control - Close
c. 3 Enables 3.0VDC from modem to board -Open
d. 4 Audio in control - Open
9. USB connector – USB communication (J121 on PCB) for programming and
data.
10. RS-232 connector – RS-232 communications (J120 on PCB) for programming
and data.
11. External speaker connector – use left and right pins (P61 on PCB, central pin
is power GND). Connect 1W minimum, 4/8/16 ohm speaker.
12. Audio headset connector – use SYN6962A 2.5mm, connector (J80 on PCB).
13. Microphone connector – use SYN5708A 2.5mm, connector (J122 on PCB).
14. Fuse 5A – F2 on PCB, protects 3.6VDC to modem (jumper 23 in right
position for on board regulator, in left position for external 3.6VDC direct to
modem)
15. Option Select control DIP switch – S5 on PCB, in normal operation all
switches have to be in off position. From left to right
a. 1 Option select 1 control
b. 2 Option select 2 control
c. 3 Enables 3.0VDC from modem to board
d. 4 Audio in control
16. Flat cable carries all functions from/to modem and board
17. SIM card connector – for operation SIM card needs to be in place.
18. Modem under test
19. Antenna jumper cable – connect MMCX connector to modem and mini UHF
connector to external antenna.
20. RS-232 status LED's (D8-D11 on PCB)
21. Modem registration status LEDs (D2-D3 on PCB)
22. Audio volume for external speaker and headset DIP switch (S9 on PCB). For
maximum volume all switches have to be in the OFF position. Left most
switch (1) LSB. Right most switch (4) MSB.
23. DC input control – P60 on PCB, jumper in the right position for on board
regulator, in left position for external 3.6VDC direct to modem.
Page 5 of 8
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