Specifications

Appendix A: Details of Model 6203/6204 Hardware
162 025-9581M
If the Model 6203 is interfaced with a radio, this jumper should probably be in the “RAD”
position to enable lower output levels.
Jumper JP6 & JP7 (PA Relay Bypass Circuits)
The posts for these jumpers are not installed on the circuit board for normally shipped
products. Connecting their contacts makes a short across the output of the PA relay. This
would cause audio to be routed out the PA pins regardless of the state of the relay.
Jumper JP8 (2-Wire RCV Impedance)
This jumper selects the impedance of the 2-wire receive audio. There are three choices for
the position of this jumper:
Position A = 600
Ω
Position B = 3.3 kΩ
No Jumper = This is the same as position “B”
This jumper should be in the “A” position (600
Ω) for one Model 6203. If there is a Model
6204 connected in parallel to the primary Model 6203, then the jumper in the Model 6204
jumper should be in the “B” position. (3.3 k
Ω).
Jumper JP9 (COR Input Pull-Up)
This jumper selects whether the COR input is pulled-up through a 10K resistor or is
floating. There are three possible choices for the position of this jumper:
Position A = Pulled-up (default)
Position B = Floating
No jumper = This is the same as position “B” (floating)
If the Model 6203 “RX COR” (J5-1) input is not used (not connected to a radio), this
jumper should be in the “A” (pulled-up) position. If “RX COR” input is connected to a
radio COR output that is controlled by a contact closure this jumper should also be in
position “A” (pulled-up). If “RX COR” input is connected to a radio COR output that is an
active pull-up to a voltage source, this jumper should be in the “B” position (floating). If
the communications system is a trunked system with the Model 6203 “RX COR” input
connected to a grant signal which is active low, then this jumper should be in the “A”
(pulled-up) position. If the COR signal from the radio is able to drive the Model 6203 “RX
COR” input high and low (bi-polar driver), then the jumper should be in the “B” (floating)
position.
Note The optimal setting will vary due to different models of radios.
When configuring JP5 for a radio, start with “RAD”, but change the
setting as needed to get 60% channel deviation.
Warning! If the COR input (Pin 1 on J5) is not used, it must be
grounded.
STOP