ZETRON 025-9581M, Installation And Maintenance Manual

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Jumper Details
Jumper JP1 (RAM Select)
This jumper selects the size of on board RAM. There are three choices:
Position A = 32K RAM
Position B = 8K RAM
No Jumper = 8K RAM
All Model 6203 and 6204 units use 32K RAM. This jumper should always be in the “A”
position.
Jumper JP2 (Microprocessor Mode Select)
This jumper is for testing purposes and should otherwise never be installed.
Jumper JP3 (VOX Control)
This jumper enables or disables the VOX circuit. There are three choices:
Position A = VOX disabled (use this setting for radios with
Carrier Operated Relay)
Position B = VOX enabled
No jumper = Enables VOX
On the Model 6203 this jumper should always be in the enabled position (B). The reason
for this is that the Model 6203 uses the VOX signal in all of its COMM modes to
determine PA muting.
Jumper JP4 (FFSK RCV Select)
This jumper enables or disables the automatic gain control (AGC) circuit for FFSK
signals. There are three choices:
Position A = Bypasses the AGC circuit (default)
Position B = Enables the AGC circuit
No Jumper = Prevents reception of all data from the Model 26
The normal position for this jumper is the bypass position (A). The FFSK modem chip
that receives this signal in the Model 6203 has its own gain control circuit. If no jumper is
installed, the Model 6203 cannot communicate with the Model 26.
Jumper JP5 (FFSK Output Range)
This jumper selects between 3 different output signal level ranges for FFSK transmissions.
There are four choices for the position of this jumper:
Position “ TEL ” = The middle output level - Not typically used
Position “ PWR ” = The highest output level - This level should
not be needed
Position “ RAD ” = The lowest output level - Use for radio
No Jumper = This is the same as the “ TEL ” position