Watkins-Johnson Company WJ-8711A, Installation, Operation And Maintenance Manual

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WJ-8711A DIGITAL HF RECEIVER LOCAL OPERATION
3-9
mode is enabled, the 10-dBm digit is highlighted indicating the entry resolution. Pressing the SQUELCH key
again causes the 1-dBm digit to be highlighted. Pressing the key one more time causes "- - -" to be displayed
meaning the squelch is off. Pressing the key while "- - -" is displayed causes the last entered numeric squelch
parameter to be displayed, with the 10-dBm digit highlighted. The squelch value can be adjusted with the
numeric entry keys or the Auxiliary Parameter edit knob (refer to
paragraph 3.2.19 ). The squelch parameter
entry mode can be exited by pressing any other Auxiliary Parameter key, extinguishing the SQUELCH LED.
3.2.14
THE AGC KEY AND LED
The AGC key is located below the upper display in the Auxiliary Parameter section. This key
is used to set the gain control mode of the receiver. When the gain control entry mode is active, the LED in
the key is lit. The upper Auxiliary Parameter display shows the current gain control setting. Each press of the
AGC key steps through the possible choices of FST (AGC fast), MED (AGC medium), SLO (AGC slow), or
manual gain. When manual gain is selected, the numeric gain value of 000 to 127 dB can be adjusted with the
MANUAL GAIN knob (refer to
paragraph 3.2.39 ). If the displayed mode is manual gain, pressing the key
again causes FST to be displayed. The gain control mode can also be adjusted with the Auxiliary Parameter
edit knob when in the gain control entry mode. The gain control entry mode can be exited by pressing any
other Auxiliary Parameter key, extinguishing the AGC LED.
3.2.15
THE BFO KEY AND LED
When the CW detection mode is selected, a beat frequency oscillator (BFO) frequency can be
entered. The BFO key is used to allow the entry of the BFO frequency. This key is located below the upper
display in the Auxiliary Parameter section. When the BFO entry mode is enabled, the BFO key LED is lit.
The current BFO frequency is displayed in the upper Auxiliary Parameter display. The BFO entry can be any
frequency from +8000 to -8000 Hz. When the BFO entry mode is entered, the 1-kHz digit of the frequency is
highlighted indicating the resolution. Each successive press of the BFO key causes the cursor to shift one
digit to the right. If the cursor is present in the 10-Hz position when the key is pressed, the cursor wraps
around to the 1-kHz digit. The BFO frequency can be entered with the Auxiliary Parameter edit knob or the
numeric entry keys. When numeric entry keys are used, pressing the BFO key terminates the numeric entry.
The BFO entry mode can be exited by pressing any other Auxiliary Parameter key, extinguishing the BFO key
LED.
3.2.16
THE +/- ZERO KEY
The +/- ZERO key is located below the upper display in the Auxiliary Parameter section. This
key provides three functions to alter the BFO setting when the CW detection mode is selected. These
functions are listed below.
•
When pressed while the displayed BFO value is positive, it changes the BFO
value to negative (-).
•
When pressed while the displayed BFO value is negative, it changes the BFO
value to zero (0000).
•
When pressed while the displayed BFO value is zero (0000), it changes the
BFO value to the absolute value of the last setting (either positive or
negative).
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