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frequency points including "Lowest", "Low", "Mid", "High" and "Highest" respectively and the number from
0 to 255 for setting max sensitivity of all points.
7.3.9 Receiver Squelch setting
Double-click to enter "SQL9 open" in "Interphone Performance Tuning" Mode and click "Broadband" to
make the frequency of the transmitting signal corresponding to the receiving frequency (level of -116dBm,
modulation signal of 1kHz and frequency offset of 3kHz) showed at each frequency point of the software.
Enter all points including "Lowest", "Low", "Mid", "High" and "Highest" respectively for automatic
adjustment of software and then press next point after no big change to numbers. After that, adjust
"Narrowband", the debugging method is the same as that of "Broadband" except the input modulation
signal is changed to frequency of 1kHz and frequency offset of 1.5kHz.
Select "SQL9 open" in "Interphone Performance Tuning" Mode and click "Broadband" to make the
frequency of the transmitting signal corresponding to the receiving frequency (level of -118dBm,
modulation signal of 1kHz and frequency offset of 1.5kHz) showed at each frequency point of the
software. Enter all points including "Lowest", "Low", "Mid", "High" and "Highest" respectively for
automatic adjustment of software and then press next point after no big change to numbers. After that,
adjust "Narrowband", the debugging method is the same as that of "Broadband" except the input
modulation signal is changed to frequency of 1kHz and frequency offset of 1.5kHz.
Select "SQL1 open" and "SQL1 close" respectively in "Interphone Performance Tuning" Mode, and
adjust by the same method except the open level of transmitting signal changed to -120dBm and the
close level to -126dBm.
7.4 Receiving Low-voltage Alarm
Adjust power voltage to 6.8V and double-click to enter "Receiving Low Voltage" in "Interphone
Performance Tuning" Mode for automatic detection of the software, and then click "Save" for exit after no
or little variation in numbers.
7.5 Adjusting explanation
Table 3 Voltage controlled oscillator
Item
Test condition
Supply
voltage
Setting
terminal:7.4V
CH:
Receiving
Locking
frequency point
voltage
CH:
Transmitting
frequency point
Table 4 Receiving part
Item
Test condition
Instrumentation
battery
DMM
low
high
Instrumentation
BR200D-U1/BR300D-U1 Service Manual
Correcting
Test point
member
CV
TC2
Test point
Correcting
member
40
Requirement
Remarks
1.0V±0.2V
Adjustment
Observation
≤4.0V
Remarks
Requirement
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