WJ-8611 DIGITAL VHF/UHF RECEIVER
LOCAL OPERATION
3-23
10 dBm DIGIT
- This selection displays the last selected squelch level
with the 10 dBm digit flashing. When this selection mode is active,
rotation of the EDIT knob changes the level in 10 dB increments. A value
may also be entered at the key pad, terminated with the SQUELCH key.
ON
- The ON selection turns the squelch ON at all times, disabling the
audio output.
The Squelch level should be set above the noise floor to disable the output
when only noise is present. When properly set, signal levels slightly above
the noise floor break the threshold and provide the audio. Setting the
threshold too high could cause the receiver to not respond to weak signals.
By tuning the receiver to a point where no active signal is present, an
operator can adjust the threshold until the audio output is disabled, or until
the chevron extinguishes, as follows:
1.
Tune the receiver to a point where no signal is present.
2.
Set the threshold level to a level that activates the audio output and
displays the squelch status chevron.
3.
Increase the threshold level until the noise at the audio output is
disabled, and the chevron is extinguished.
4.
Tune the receiver to the desired signal. The above procedure sets
the threshold slightly above the ambient noise level. Slight
additional adjustment may be required, depending on changes in the
ambient noise level.
3.3.7 NOISE BLANKING OPERATION
The Noise blanker feature reduces the affects of noise bursts at the audio
outputs by blanking the output momentarily when the noise bursts occur.
It is selectable in the AM, LSB, and USB detection modes. The
effectiveness of the Blanker feature is reduced with weak signal activity.
A signal-to-noise ratio of at least 12 dB ensures reliable Blanker operation.
When the BLANKER key is pressed, the LED on the key lights, and the
noise blanking feature is activated. When the Blanker feature is active,
pressing the BLANKER key disables blanking and extinguishes the LED.
The noise blanker provides a blanking pulse of from 1 to 10 msec,
selectable from the menu 9 of the Configuration Menu. This value should
be set with the Blanker feature active, and when a signal with interfering
noise bursts is present. The noise blanker value should be set for the best
audio output while listening to the audio, as follows:
Activate the Configuration Menu by pressing the MENU key.
Press the MENU key until the Blanker menu is displayed, similar to the
following:
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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