J5 (OFF) Modem Loopback
J6 (TXA) TXA or FSK/TXD select for Radio port
pin 1
J7 (OFF) Modem input equalization
J8 (OFF) Modem Drive Level Range
(ON = High Range; OFF = Low Range)
J9 (Pos 1) A/D input#2 or GPS input from AUX port
pin 3
J10 (ON) Modem input impedance select
(ON = 620 ohms, OFF = 10Kohms)
J11 (OD) Relay or Open Drain select to jumper
J4
for Radio port pin 9
J12 (not installed) Used when EEPROM option is installed
* J13 (not installed) Converts AGC circuit to a
unity gain buffer (an option)
* J14 (not installed) Used with Positive PTT when
that option is installed
J15 (OFF) Test/Reset jumper for the processor
J16 (FSK) Sets digital output for J6 to “FSK
Open
Drain” (FSK) or “Logic drive” (TXD)
J17 (Pos 2) ROM Size (postion 1= up to 128K;
position 2= 128K to 512K)
J18 (Pos 1) Allows for external input from pin 2
of
AUX port to microprocessor IRQ input
J19 (Pos 1) Selects normal modem output or an ex
-
ternal
digital signal for decoding
J20 (OFF) PTT output watchdog timer
J21 (Pos 1) Selects AGCed and filtered input sig
-
nal
or an external signal for A/D #3
J22 (Pos 1) Selects undemodulated or
demodulated signal for decoding
J23 (Pos 1) RAM size (position 1= up to 128K;
position 2= 128K and over)
J24+J25 (OFF) Real time clock jumpers.
Both jumpers ON = chip not in
-
stalled;
Both jumpers OFF = chip installed)
J26 (not installed) Power supply Output Voltage Select
* This jump position is metalized on the board
Appendix B: Advanced Information KAM’98 Jumpers
User’s Guide 340 KAM’98 v 8.3
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