FP520 Service Manual
Page 24 of 64
adjusted to 0.8-1.1W.
3). The Maximum Frequency Deviation (the modulation signal is 1kHz/120mV)
Under the computer mode [the maximum audio frequency deviation] (the broadband has five frequencies and
the narrowband has one; six frequencies in total), adjust the maximum transmitting frequency deviation to
1.8-2.5 kHz.
4). DTMF Frequency Deviation
Under the computer mode [DTMF frequency deviation]
(six frequencies in total), adjust the DTMF frequency
deviation to 1.5-2 kHz.
5). DCS Balance
Under the computer mode, [DCS balance] (the broadband has five frequencies), adjust the DQT and make it
balanced, so the demodulated DQT wave can be square and smooth.
6). DCS Frequency Deviation
（
DQT
：
023N
）
Under the computer mode, [DCS frequency deviation] (the broadband has five frequencies and the narrowband
has one; six frequencies in total), adjust DCS frequency to 0.3-0.5kHz.
7). CTCSS Frequency Deviation
（
QT
：
67.0Hz
，
150.4Hz
，
250.4Hz
）
Under the computer mode, [CTCSS (67Hz
，
150.4Hz
，
250.4Hz) frequency deviation] adjust the CTCSS
frequency deviation to 0.3-0.5kHz.
8). Battery low voltage indication when transmitting: the voltage is set as 6.8V
，
under the computer mode
[transmitting low voltage]
，
click confirm when the digits are stabilized.
C. RX Part
1). Receiver Pass Band
a. Program the spectrum analyzer, and test the receiver pass band at the test point with a high frequency probe.
b. Under the computer mode [receiving sensitivity] (test in five frequency points), adjust the receiver pass band
to the corresponding center frequency.
2). The Maximum Volume
Set the RF frequency as the center frequency, the signal strength as 1mV, and the modulated frequency
deviation as 1.5 kHz. Under the computer mode, set the computer audio power as 1.1-1.3W.
3). Squelch
a. Set the RF signal as -121dBm and the modulated frequency deviation as 1.5 kHz. Under the computer mode
(on) (five frequency points), click confirm when the digits are stabilized.
b. Set the RF signal as -123dBm and the modulated frequency deviation as 1.5 kHz. Under the computer mode
(off) (five frequency points), click confirm when the digits are stabilized.
4). Field Strength
a. Set the RF signal as -121dBm and the modulated frequency deviation as 1.5 kHz. Under the computer mode
(low RSSI) (five frequency points), click confirm when the digits are stabilized.
b.Set the RF signal as -70dBm and the modulated frequency deviation as 1.5 kHz. Under the computer mode
(high RSSI) (five frequency points), click confirm when the digits are stabilized.
6.2 Radio Test
The following criteria should be tested:
A. Receiving part
1). Sensitivity: <= -119dBm (0.25uV) (broad band, narrow band) 12dB SINAD
2). Distorsion: <=5%
3). Current: static current: <=100mA
Summary of Contents for FP520
Page 1: ... 键入文档副标题 gh 选取日期 在此处键入文档的摘要 摘要通常是对文档内容的简短总结 在此处键入文档的摘要 摘要 通常是对文档内容的简短总结 ...
Page 44: ...FP520 Service Manual Page 43 of 64 Figure 1 FP520 01 Mainboard Schematic Diagram 136 174MHz ...
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Page 54: ...FP520 Service Manual Page 53 of 64 Figure 4 FP520 02 Mainboard Schematic Diagram 400 470MHz ...
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Page 64: ...FP520 Service Manual Page 63 of 64 Figure 7 KBC 51 7 4V Electrical Schematic Diagram ...
