Specifications

Appendix C: Using a Model 620x in a Model 26-based System
178 025-9581M
The general instructions for connecting to the relays can be found under Output Relay
Connections on page 114. A detailed description of the relay connections can be found
under Relay Connections (P1-P4) on page 154.
Connections to Radios
The material shown in the following sub topics is taken from the Model 6 manual. If a
station does not have a secondary unit simply ignore any of the connections indicated for
one.
Conventional Radios
The following figure displays the basic connections made in system using conventional
radios to pass FFSK packets and voice audio between the Model 26 and the station
transponder units.
• If a COR (carrier detect) signal from the radio is used, you will need to program the
M620x for COR operation with either active high or active low carrier detect
12345678
ON
SW-1
12345678
ON
SW-2
Unit Address = 5
Primary Model 6
4
3
1
J5
11
9
8
J4
1
11
9
J3
4
3
1
J5
11
9
8
J4
1
11
9
J3
Unit Address = 517
Secondary Model 6
PA System
Conventional Radio
12345678
ON
SW-2
12345678
ON
SW-1
4W RX
4W RX
RX COR
TX & 2W RX
TX & 2W RX
TX PTT
PA Busy
PA Audio Comm A
PA Audio Comm B
RX
Audio
COR
TX
Audio
PTT
= Not used for setting address = Not used for setting address