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KPC-3 Plus Jumpers
Jumper Locations
To locate jumpers listed below, use the schematic shipped with the unit and (for locations
on the printed circuit board) the parts layout in Appendix E.
Printed
Schematic Circuit
Jumper # Location Location Name .
J1 A-6 D-4 battery option
J2 A-6 D-4 battery option
J3 D-2 D-1 modem input impedance
J4 D-2 D-1 equalization
J5 C-1 D-2 ground/reset
J6 B-1 D-2 reset/input
J7 B-1 D-2 serial configuration
J8 B-1 D-2 analog input AN0
J9 C-1 D-1 normal/HT
J10 B-2 D-2 analog input AN1
J11 C-4 C-3 reset jumper
J12 C-3 C-1 PTT watchdog
J13 C-6 C-3 ROM size (KPC3-Plus)
J14 C-6 A-3 RAM size
J15 D-4 A-1 NA
J16 A-5 B-4 power supply
J17 full dup (KPC3 Plus MX)
J18 full dup (KPC3 Plus MX)
J19 full dup (KPC3 Plus MX)
J20 full dup (KPC3 Plus MX)
J1 and J2: (battery options) These jumpers can be configured several ways. J1 is
normally OFF, and J2 is normally ON. This allows for power from a 9-V battery to be
switched into the circuit when the external power plug is removed. If it is desired to have
―backup‖ 9-V battery power in the event of loss of the external power source, J1 should
be ON, and J2 should be OFF. In this case the 9-V battery is isolated from the external
power by CR2 which prevents a higher external voltage from being applied across the
battery.
J3: (modem input impedance) this 2-pin jumper, when installed, sets input impedance of
the modem to 600 Ω. When placed on one pin only, input impedance is set to 10 kΩ.
Default is 10 kΩ.
J4: (equalization) This two-pin jumper is used to set receive equalization for the modem.
When placed on both pins, no equalization is selected, and when placed on one pin,
partial equalization is used. See the calibration/equalization section for details. Default
is no equalization.
J5: (DSUB-9 Ground/reset) This three-pin jumper connects pin 9 of the radio port to
ground or to the reset circuit. When placed on the center pin and pin 1, pin 9 of the
DSUB-9 connector is connected to ground. When placed on the center pin and pin 2,
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