DRS WJ-8611, Инструкция по установке, эксплуатации и обслуживанию

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WJ-8611 DIGITAL VHF/UHF RECEIVER
LOCAL OPERATION 3-17
at an acquired signal’s frequency after the signal falls below the
programmed squelch level. The post dwell setting can range from 0
to 61, in 1 second increments. Values ranging from 0 to 60 specify
the post dwell time in seconds. A value of 61 specifies an infinite
dwell time.
3.3 MANUAL OPERATION
The Manual Mode of operation provides an operator with continuous control
over receiver operation. In this mode, the receiver’s control parameters may
be directly modified using the front panel controls. When operating the
receiver in the manual mode, the following functions and parameter
adjustments are under control of the local operator:
•
Frequency Tuning
•
Parameter Selections
•
Memory Programming and Recall
•
Configuration Menu Selection.
•
Scan Setup Operations
•
Execution of Scan Operations
•
Phone Audio Level Adjustment
3.3.1 FREQUENCY TUNING
The WJ-8611 Digital VHF/UHF Receiver has a 0.00000 to 1000.00000 MHz
tuning range, with a selectable tuning resolution down to 10 Hz. Tuning in
the 2 to 20 MHz range provides HF tuning capabilities adequate for many
applications. In this range, the noise figure is typically 8 dB. In the manual
operating mode, tuning is performed at the front panel by rotation of the
tuning wheel, by direct entry from the keypad, or, in the SHIFT mode, by
using the Left (
←
) and Right (
→
) arrow keys. In automatic operating modes
(i.e., F1-F2 or Channel scan), the tuned frequency is obtained from the
receiver’s preprogrammed memory.
TUNING WHEEL - The tuning wheel provides dynamic control over the
tuned frequency while monitoring the received audio and the TUNE meter
display. Rotation of the tuning wheel increases or decreases the tuned
frequency at a rate determined by a flashing digit in the frequency display
(decade tuning), or by a selected step size (step tuning).
DECADE TUNING - The decade tuning resolution is determined by the
flashing digit in the tuned frequency display. It allows tuning resolutions
ranging from 10 Hz to 1000 MHz to be selected. The left (
←
) and right (
→
)
arrow keys move the flashing cursor to the desired digit, determining the
minimum tuning resolution in decade increments. The left (
←
) key,
increases the increment size by moving the flashing digit to the left. The
right (
→
) key decreases the increment size by moving the flashing digit to
the right.
STEP TUNE - Step Tuning is activated when the STEP TUNE key is
pressed, and the LED on the key is lit. When this tuning mode is active, the
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