WJ-8711A DIGITAL HF RECEIVER
LOCAL OPERATION
3-31
NOTE
In the USB or LSB detection modes, only IF bandwidths
from 900 Hz to 3.2 kHz are selectable. In the ISB
detection mode, only IF bandwidths from 1.8 kHz to
3.2 kHz are selectable.
3.5.3.1
Including an IF Bandwidth Filter for Selection
Any of the 66 available IF bandwidth filters can be included for selection by the receiver. The
IF Bandwidth Select mode is used to "include" or "skip" the desired IF bandwidth in the list of available
filters.
The IF Bandwidth Select mode is enabled by pressing the SPECIAL FUNCTION key until the
upper Auxiliary Parameter display appears as follows.
IF BW SELECT
The currently selected IF bandwidth is displayed in the lower Auxiliary Parameter display
along with the word "include" or "skip". When "include" is displayed, the identified bandwidth will be
included in the available IF bandwidth list used for making IF bandwidth selections as described in
paragraph 3.5.3
. If "skip" is displayed, the identified bandwidth will not be available for selection.
Once in the IF Bandwidth Select mode, each of the 66 IF bandwidth filters can be set to
"include" or "skip" as desired. To set a filter for "include", first select the desired IF bandwidth by rotating the
Auxiliary Parameter edit knob until that bandwidth is displayed in the lower Auxiliary Parameter display.
Each press of the IF BW key toggles the status of the selected filter from "include" to "skip".
3.5.4
SETTING THE SQUELCH LEVEL
The squelch can be adjusted to a level, depending on the strength of the signals being
received. If a signal is received that is not quite strong enough for proper demodulation (i.e., its audio is
unclear), the squelch level can be adjusted to block it from being applied to the audio outputs. The squelch
should be set to a level where it does not block clear signals but does block noisy unwanted signals. Several
adjustments may have to be made to find the optimum level. Only signals that have a power level above the
set squelch level will be provided at the audio outputs.
The current squelch level is displayed in the lower auxiliary parameter display, directly above
the SQUELCH key. The range of the squelch level is 0 to -135 dBm or can be set to off ("- - -"). The squelch
level can be adjusted by first pressing the SQUELCH key to light its LED and to enter the squelch entry mode.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8711A
Page 4: ...iv THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 19: ...1 i SECTION I GENERAL DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 33: ...2 i SECTION II INSTALLATION Courtesy of http BlackRadios terryo org...
Page 34: ...2 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 47: ...3 i SECTION III LOCAL OPERATION Courtesy of http BlackRadios terryo org...
Page 48: ...3 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 93: ...4 i SECTION IV RS 232 REMOTE OPERATION Courtesy of http BlackRadios terryo org...
Page 94: ...4 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 123: ...5 i SECTION V CSMA REMOTE CONTROL Courtesy of http BlackRadios terryo org...
Page 124: ...5 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 143: ...6 i SECTION VI CIRCUIT DESCRIPTION Courtesy of http BlackRadios terryo org...
Page 157: ...7 i SECTION VII MAINTENANCE Courtesy of http BlackRadios terryo org...
Page 158: ...7 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 189: ...8 i SECTION VIII REPLACEMENT PARTS LIST Courtesy of http BlackRadios terryo org...
Page 190: ...8 ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
Page 241: ...FP i FOLDOUTS Courtesy of http BlackRadios terryo org...
Page 242: ...FP ii THIS PAGE INTENTIONALLY LEFT BLANK Courtesy of http BlackRadios terryo org...
