GAI-Tronics CB193-001 Call Boxes - Manual (Page 40)

Pub.: 43004-031E
Model CB193-xxx, CB194-xxx, and CB195-xxx RF Call Boxes Page 39 of 52
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Jumper Settings
Carrier Level Detect
Activation of the RF Call Box circuitry relies on a carrier detect signal provided by the radio (HIGH or
LOW). The Carrier Detect Level is adjusted using Jumper P4. Factory default is set to LOW.
Note for CB19x–003 Models: When using a Kenwood TK-3170 Series Radio, jumper P4 must be
moved to the HIGH position.
Private Line (TCS/DCS) Detection
In addition to the Carrier Detection, the activation of the RF Call Box circuitry may also require receipt
an appropriate PL code, if programmed to do so. PL Detection is enable or disabled (ON/OFF) using
Jumper P9. Factory default is set to ON. This setting should be changed to the OFF position if PL is not
utilized in the RF operating system. This setting must match the other radios and Call Boxes in the
system.
Radio Output Power (CB19x-001 and CB19x-002 Models Only)
The output power of the RF module can be changed (LOW or HIGH) using Jumper P5. Factory default
is low (2 watts). When using high output power (5 watts), an external antenna is required.
Handset Microphone Enable (CB194-xxx Only)
The Handset Microphone is enable or disabled using Jumper P8. The jumper is installed only in all
CB194-xxx Series RF Call Boxes.
Fuses
F1 is the external power fuse, which limits the current draw from the external power supply. The
functionality of F1 can be verified by measuring approximately 13.2 V dc at EXT PWR test point
referenced to the AGND test point.
F2 is the battery fuse, which limits the current draw to and from the battery. Functionality of F2 can be
verified by measuring approximately 13 V dc on both sides of the fuse referenced to the AGND test
point. The same voltage should be measured on each side of the fuse.