General Purpose Keypad - Watkins-Johnson Company WJ-8718-19/FE Instruction Manual

INSTALLATION AND OPERATION
WJ-8718-19/FE HF RECEIVER
2.4.3.2 General Purpose Keypad
The general purpose keypad is the 16-button switch block located to the
left of the tuning wheel. The multi-function, numerical selection buttons labeled 0
through 9 are utilized to enter RF and BFO frequencies, signal threshold level BFO
offset, dwell time and memory address. A special function key (*) is used to place
the receiver in the BITE mode and to clear the numbered memory channels.
2.4.3.2.1 Terminator Functions
The software structure of the microprocessor in the receiver control block
is such than an accepted numerical keypad entry is not acted upon until a termination
switch is activated. The terminator informs the microprocessor how the number is to
be used. Table 2-1 lists the termination switches and their associated function.
Table 2-1. Termination Switches
Switch
MHz
kHz
RECALL
STORE
AUTO SCAN
EXAM
DWELL
THRS
LOCK OUT
Special Function (*)
CLEAR
Function
RF frequency
BFO or RF frequency
Memory address
Memory address
Initiate scan mode
Memory address
Scan pause, in seconds
Signal level threshold
Memory address
See paragraph 2.4.7
Terminate BITE, Receiver
BITE Tests and EXAM escape.
2.4.3.2.2 CLEAR Keypad Switch
The CLEAR key will remove an unterminated numerical entry from the
receiver's internal circuits. Once the terminator is entered, the CLEAR switch does
nothing. The CLEAR switch is also used to release the EXAM mode. See paragraph
2.4.4.4 for explanation of EXAM mode.
2.4.3.2.3 Special Function Switch
The (*) key is a special function keys used to access the BITE program
mode, to access the receiver BITE tests, and to clear all numbered memory channels.
The (*) key also turns on or off the special master mode. Refer to paragraph 2.4.7
for details on using the special function switch.
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