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20-62 VHF & UHF TRANSMITTER
Product Manual
Sea Air and Land Communications Ltd, 10 Vanadium Place, Addington, Christchurch 8024, New Zealand
March 2020
20-62 Installation and Quick Start Guide
Power Supply
Power is connected to the green “Power” connector on the front panel with the polarity as
shown. Nominal supply voltage is 13.8V DC, but may vary between 10.8V and 15V. The power
source must be reasonably noise free. The 20-62 is protected against reversed polarity.
Antenna Installation
The antenna is connected to the SMA connector on the rear panel. Installing the antenna
outside, clear of obstacles, and high above the ground will most likely provide the best radio
coverage.
The antenna should present a nominal load of 50Ω, with a VSWR of better that 1.8:1. The
transmitter output power may be affected by a poorly matched antenna (ie if not 50 ohms at
the transmitter frequency).
The 20-62 is designed to operate reliably over large distances, however the actual distance can
vary depending on antenna height and position, obstructions, antenna cable length, local radio
interference, antenna specifications, and the sensitivity of the receiver.
Important! To comply with FCC Controlled/Occupational Exposure Limits the aerial must be
positioned or mounted to operate at least 0.26 metres (0.853 ft) away from operational staff and
0.57 metres (1.87 ft) away from the general public as a safeguard against radiated emissions.
Serial connections
The 20-62 may be configured to operate without a serial connection, transmitting regular
messages, or transmitting messages in response to trigger inputs or the battery level.
For other messages, the RJ12 serial connector provides two RS-232 serial ports. Serial connection
may also be made via the USB connector or the Ethernet port.
RS-232 serial ports
Two RS-232 serial ports are provided on the RJ12 serial connector. A standard 6 way RJ12 6P6C
cable and splitter may be used to separate the two ports if required.
The Salcom 12-45-0000 adaptor converts port 1 of the RJ12 to a DB-9 connector. The Salcom 12-
45-2000 converts port 2 of the RJ12 to a DB-9 connector.
The RG12 pin-out is provided above for custom cables.
