User's Manual

DATA OPTIONS
INTERNAL DATA MODEM (2400 BIT/S)
314 E
NVOY™ TRANSCEIVER REFERENCE MANUAL
Internal data modem (2400 bit/s)
NOTE: The Internal Data Modem option must be enabled in your Envoy™
Transceiver (X2 only).
The internal data modem provides an extremely robust, field-proven HF waveform
that is interoperable with Codan’s proprietary 3012 protocol. It is particularly useful
for long-range communications in remote areas where existing communications are
poor or non-existent. It incorporates data compression to boost effective throughput
and is easily integrated with Codan voice and signalling networks.
This modem can be used with ALE and Selcall call systems. Voice links may be
established first, then an in-link data exchange may be performed.
A typical internal data modem station comprises:
• an Envoy™ X2 Transceiver with the Internal Data Modem (2400 bit/s) option
enabled (Codan part number 15-10559)
• a suitable 12 V DC power supply
• an antenna system
• a PC running UUPlus or suitable terminal program
NOTE: Software that operates on standard telephone modems should
operate over HF via the AT commands.