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12-38-0000 VHF AND UHF TRANSCEIVER
Product Manual
Sea Air and Land Communications Ltd, 10 Vanadium Place, Addington, Christchurch 8024, New Zealand
February 2019
Installation and Connections
The power supply is connected via PI, green power connector to +13.8 Volts DC and Ground.
The 12-38 is protected against reversed supply connections. The power source must be
reasonably noise free.
Radiation Hazard: Important! To comply with FCC Controlled/Occupational Exposure Limits the
aerial must be positioned or mounted to operate at least 0.26 metres away from Operational
Staff and 0.57 metres away from the general public.
It is recommended to site the aerial a few metres away from the 12-38 to avoid the possibility of
RF feedback causing problems with the transmitter operation. An outside aerial is preferable and
will provide better radio coverage. The aerial connection is via the BNC connector and should
present a nominal load of 50Ω, with a VSWR of better that 1.8:1.
External indicators consist of a power indicator GREEN LED, normally flashing ON once a
second to indicate healthy microcontroller operation.
S2 RJ12
S10 RJ45
Pin
Description
Pin
Description
1
Ground
1
Ground
2
Output 1
2
PTT Input
3
Input 2
3
Mic / AV In
4
Input 1
4
Input 3
5
RS232 Tx
5
Output 2
6
RS232 Rx
6
Busy
7
Speaker / AV Out
8
+5V
Output1 and 2 are Open Collector and Inputs 1, 2 and 3 are triggered by grounding the pins.