BR200D-U1/BR300D-U1
Service Manual
39
Low Frequency Point
Intermediate
Frequency Point
High Frequency Point
DR6000-2
DR7000-2
400.100 MHz
435.100 MHz
469.975 MHz
7.3.2 PLL frequency calibration
Double-click to enter “Frequency Stability” in “Interphone Performance Tuning” to achieve the rated
transmitting frequency by adjusting the number from 0 to 255 (Error<200Hz).
7.3.3 Transmitting frequency adjustment
Double-click to enter “Transmitting High Power” in “Interphone Performance Tuning” to adjust the five
frequency points including ”Lowest”, “Low”, “Mid”, “High” and “Highest” respectively and set transmitting
power to over 4W by adjusting the number from 0 to 255 and observe the operating current (
≤
1.6A) at
the same time.
Double-click to enter “Transmitting Low Power” in “Interphone Performance Tuning” to adjust the five
frequency points including ”Lowest”, “Low”, “Mid”, “High” and “Highest” respectively and set transmitting
power to over 1W by adjusting the number from 0 to 255.
7.3.4 Transmitting low-voltage alarm
Adjust power voltage to 6.8V and double-click to enter “Transmitting 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.
7.3.5 Frequency offset adjustment
Input audio signal (12mV, 1000Hz) at MIC jack of interphone. Adjust and set frequency offset to ±2.1kHz.
7.3.6 DCS transmitting signal waveform and frequency offset adjustment
Double-click to enter “DCS
frequency offset” in “Interphone Performance Tuning” Mode, adjust
potentiometer VR1 to observe demodulated signal (the waveform shall be smooth and similar to square
wave), and then click “Broadband” to adjust all points including ”Lowest”, “Low”, “Mid”, “High” and
“Highest” respectively for frequency offset of
0.8kHz. After that, click “Narrowband” to adjust the
frequency offset to
0.4kHz.
7.3.7 CTCSS frequency offset adjustment
Double-click to enter “QT(67) frequency offset” in “Interphone Performance Tuning” Mode and click
“Broadband” to adjust the five frequency points including ”Lowest”, “Low”, “Mid”, “High” and “Highest”
respectively to 0.75kHz and then click “Narrowband” to adjust the frequency offset to 0.35kHz.
Select “QT(254) frequency offset” in “Interphone Performance Tuning” Mode, and the debugging method
is the same as that of “QT(670) frequency offset”.
7.3.8 Receiving Sensitivity
Double-click to enter “Receiving Sensitivity” in “Interphone Performance Tuning” Mode to adjust the five
Summary of Contents for BR200D-U1
Page 1: ...BR200D U1 BR300D U1 Service Manual 1 BR200D U1 BR300D U1 Service Manual ...
Page 17: ...BR200D U1 BR300D U1 Service Manual 17 Exploded View of the Parts ...
Page 20: ...BR200D U1 BR300D U1 Service Manual 20 DR7000 2 ...
Page 36: ...BR200D U1 BR300D U1 Service Manual 36 Chapter 6 PCB Layout ...
Page 37: ...MIC1 C5 D4 D5 D8 C4 C3 R1 D2 D3 D6 C7 C8 C9 J1 D1 D9 C2 D7 C6 C13 C1 ...
Page 70: ...BR200D U1 BR300D U1 Service Manual 66 Chapter 10 Block and Schematic ...
