WJ-8611 DIGITAL VHF/UHF RECEIVER
3-22 LOCAL
OPERATION
terminating the entry by pressing AGC enters the value directly. The gain
control mode characteristics are as follows:
FAST
- The Fast AGC mode is commonly used with AM and FM type
signals. It provides a fast attack and fast decay response. The typical
attack time is 10 msec, and the release time is 200 msec.
SLOW
- The Slow AGC mode is commonly used with CW or SSB type
signals that have suppressed or intermittent carriers. It provides a fast
attack time of 10 msec. However, the release time is lengthened to
maintain a relativity constant gain with wide variations in carrier levels.
The release time for the Slow AGC mode is typically 3 seconds.
MANUAL
- The Manual gain mode provides no automatic control of the
receiver gain. When an attenuation level is set, it remains constant,
regardless of the received signal’s strength. The receiver gain is "Gain-
Bandwidth" normalized so that the rated output occurs close to the rated
sensitivity level. As the IF bandwidth is increased, the absolute gain is
decreased.
3.3.6 SQUELCH OPERATION
The SQUELCH key allows the entry of the receiver’s squelch level to
determine the signal level at which the receiver recognizes a received
signal as valid. It sets the signal threshold where the receiver activates the
audio output, and is used in the receiver scan operations to determine if the
scan should stop on a signal contact. When the SQUELCH key is pressed,
the LED on the key lights and the SQL(dBm) field of the parameter
display flashes with the currently selected squelch level. The squelch
level may be set in the range from -30 to -130 dBm, in 1 dB increments. A
setting of -29 turns the squelch ON at all times, preventing the receiver
from recognizing a signal contact, regardless of the signal level. A setting
of -131 sets the squelch to OFF. When the squelch is OFF, the squelch
threshold is set below the noise floor, causing the audio to be active at all
times, even if no signal is present. A chevron, to the left of the SQL(dBm)
field of the display, provides an indication of the squelch status. When the
signal level is above the selected threshold (Squelch OFF), the chevron is
displayed. When the signal is below the threshold (Squelch ON), the
chevron is extinguished.
Each press of the squelch key steps the SQL(dBm) field through its four
selection modes, as follows:
OFF
- The OFF selection turns squelch off, providing a continuous audio
output.
1 dBm DIGIT
- This selection displays the last selected squelch level with
the 1 dBm digit flashing. When this selection mode is active, rotation of
the EDIT knob changes the level in 1 dB increments. A value may also be
entered at the key pad, terminated with the SQUELCH key.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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