8.2. Functions
a) Receive / transmit control
• KEY IN input - Phono RCA connector
- Voltage applied to the transceiver keying output - up to +12 V;
- Closed-circuit current flown to the transceiver keying output - up to 6 mA;
• KEY OUT output - open-drain Phono RCA connector
- Output resistance: not more than 120 Ohm;
- The maximum allowable open-circuit voltage coming from external devices
connection: +50 V;
- Maximum allowable closed-circuit current flown by external devices: 20 mA;
• Minimum required time of sequencing between sending a request for transmitting (KEY-
IN "ground on transmit" signal) and applying RF drive power at RF INPUT connector for
safely switching receive to transmit: 10 ms.
b) Protections
• Inrush power-on current is limited
• PA drain current
• Overheating
• T/R sequencing
• Antenna relay contacts against hot switching
• Reflected power
• Overdrive.
c) Frequency control by either internal frequency counter or directly by CAT from the transceiver,
as well as via front panel buttons
d) Remote control through ACOM eBox Ethernet Remote Control device (function in
development) or via RS-232 interface
e) Remote POWER ON by DSR/DTR and CTS/RTS lines on the RS-232 port or by ACOM eBox
Ethernet Remote Control device (function in development)
f) Remote POWER ON / TURN OFF by DC voltage impulse or continuous DC voltage on CAT/AUX
port ON_RMT input
g) Protection against relay switching under RF power (hot switching).
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