User's Manual Part 1

4. OPERATION
A B
C
D E
F
G
Fig 1
A: Frequency group
B: Subchannel
C: Mute(if the mute function is engaged, the mute label is shown, if not , the label
disappears)
D: The selected frequency
E: Remaining battery life of transmitter
4.1 For the UP-81DR, PLL UHF Diversity Receiver
- Auto Scan
- Manual Selecting Frequency
Press the MENU button, "GROUP" is flashing, you can choose the right frequency
group you need via the UP/ DOWN button, when the frequency group is set, please
press MEN button to store the information. Press the MENU button two times,
"CHANNEL" is flashing, you can choose the right subchannel you need via the
UP/DOWN button, when the subchannel you need is set, please press the MEN
- Mute Function
In mute mode, use UP/DOWN key to on/off the mute function.(fig 2: mute function off,
fig 3: mute function on), press the MEM button to keep the information.
Note: when the transmitter is muted, no audio signal will be send out from the receiver.
When the receiver is powered on, press and hold the MEN key for one second,
the receiver is in auto scanning. The scan function automatically searches the
receiver's entire frequency band from start to stop. During the search, the audio
output is muted and the display indicates the frequencies in MHz as they are
scanned. As soon as the correct frequency is reached, the scan will be stopped
automatically, the value of frequency will be flashing, press the MEM key, you
Remark: some frequencies should be scanned manually by adjusting UP/DOWN
key, please refer to Annex for details!
G: RF bar graph indicating the field strength of the received signal.
F: Audio bar graph indicating the receiver audio level
9
can save the information.
button to save it.
Fig 3 mute function on
Fig 2 mute function off
- Output Level Adjusting
In output level adjusting mode(see fig 4), use the SELECT button to adjust the output
level. The output level has 3 choices, 0 indicates the output level is 500mV, 1 indicates
the output level is 300mV, 2 indicates the output level is 150mV.
Note: the function is only applied to the level of Balanced output.
Fig 4
below a defined threshold. The squelch control on the receiver sets this threshold.
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.
In the squelch control mode(fig 5), use the UP/DOWN key to select squelch threshold.
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 the audio level drops
Use the squelch control with care! If the squelch threshold is too high, the squelch
In order to achieve easy operation, the squelch threshold is divided into10 levels, please
- Squelch Control
refer to table.
Fig 5
No.
squelch threshold
1
2
3
4
5
6
7
8
9
10
Table
95.0dB
91.7dB
88.3dB
85.0dB
81.7dB
78.3dB
75.0dB
71.7dB
68.3dB
65.0dB
10