TABLE OF CONTENTS
1. INTRODUCTION......................................................................................1
2. FEATURES..............................................................................................3
3. CONTROL ELEMENTS...........................................................................3
4. OPERATION............................................................................................7
5. TECHNICAL SPECIFICATIONS..............................................................9
7
4. OPERATION
4.1 FOR the UB-81R/81DV, PLL UHF DIVERSITY RECEIVER
- MANUALLY SELECTING FREQUENCY
With an adjusting bar, adjust the band selector to select the right frequency which matches
the frequency of transmitter.
- OUTPUT VOLUME CONTROL
It is used to control the output volume. Turn the knob clockwise and the output volume
increases. Turn the knob counter- clockwise and the output volume decreases.
The job of a squelch circuit is to reduce audible noise. It eliminates noise during
pauses in the audio signal by muting the receiver every time and the audio level
drops below a defined threshold. The squelch control on the receiver sets this
threshold. Use the squelch control with care! If the squelch threshold is too
high, the squelch will not only cut out noise but mute quiet audio signals as
well because the squelch responds to the detected voltage and cannot
distinguish between wanted signal and noise. Besides that, a too high squelch
threshold also decreases the usable range. The squelch range is 95.0dB~65.
0dB. Use an adjusting bar to adjust the squelch selector for a right squelch
threshold.
- SQUELCH CONTROL
4.2 FOR the UB-8H/8P SERIES TRANSMITTER
4.2.1 FREQUENCY SELECT
In practice, to effectively avoid the interference from any lighting equipment, Com-
puters, fax machines, etc nearby, It is usually advised to switch to another
frequency to get best performance.
The frequency range of this system is UHF, 740MHz ~ 769MHz, and it is divided into
16 frequency bands according to the country's EMC regulations; Each frequency band
can be manually adjusted with an adjusting bar. If you want to switch a frequency, you
have to turn off the unit, adjust frequency and then turn it on again.
4.2.2 BATTERY REPLACING AND CHARGING
Please be advised to use only one pair of AA 1.5V batteries for power supply.
Caution: Danger of explosion if battery is incorrectly replaced. Replace the batteries
only with the same or equivalent type.
Summary of Contents for UB-81DV
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