Unclassified
General Description
1-8
Table 1-1. 25 Pin Accessories Connector, Pin Functions (Continued)
Pin Designation Description
22 DSC/KW_ALC BDM – Data serial clock/external RF amplifier ALC
23 SQ GATE Squelch open/closed indication output
24 DSO/FAN ON/OFF BDM – Data serial out/Fan control
25 FREEZE/KW TU BDM – Freeze/external RF amplifier tune
NOTE
For RM500/RM500R with the ISB option, these lines
activate transmission for both the main and secondary
sidebands.
1.6.2.2 ISB Connector
The ISB connector is a 9 pin D type female connector installed only on RM500/RM500R
with the ISB option, G191 (the ISB option is covered by the Independent Sideband (ISB)
Option for MICOM 3 HF SSB Transceivers, Publication 6888882V01). This connector
contains the transmit and receive lines for the secondary sideband. Table 2 lists the
functions of the pins in the ISB connector.
Table 1-2. ISB Connector, Pin Functions
Pin Designation Description
1 EXT RX2 OUT+
Differential receive output of secondary sideband (0 dBm,
600; not affected by the volume control, nor by the squelch)
2 EXT RX2 OUT-
3 GND Ground
4, 5 - Not used
6 EXT TX2 IN+
Differential transmit input of secondary sideband (600 input
impedance; 0 dBm is required for maximum power)
7 EXT TX2 IN-
8, 9 - Not used
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