PT6500 User’s Manual
Page 22 of 26
B．The CTCSS/DCS signaling of both users are not the same,
set it with PC.
C．Beyond the efficient communication range.
4 No signal
A．Make sure the antenna is well connected.
B．Low sensibility, trimming “computer test mode”。
C．HF amplifier may be broken, replace it.
D．The squelch level is too high, which makes the squelch
unable to switch on, reset it by PC.
E．Mixer tube Q19 may be broken, replace the tube.
F．Frequency Modulation IC4 may be broken, replace the IC.
5 The transmitting red
light is on, but no
voice is heard
A．Power-amplifier tube, no power output, replace the tube.
B．Replace the microphone if it is broken.
C．Operational Amplifier IC14 may be broken, replace it.
6 Receiving green light
is on, but no voice is
heard
A．Replace the speaker if it is broken.
B．Audio power amplifier IC9 may be broken, replace it.
C．Switch Tube Q48 may be broken, replace it.
D．Operational Amplifier IC6 may be broken, replace it..
7 Abnormal
programming
A．Make sure the wires are well connected.
B．Abnormal output of the RS-232 serial port of the computer,
check the computer .
C．Abnormal connection of MIC and SPK jack, check the jack.
■ Major Specifications
General specification
Model PT6500
Frequency (1) (136 ~ 174) MHz
Modulation
16KФF3E/11KФF3E
Number of
Channels
128
Channel Spacing
25 kHz/12.5kHz
MF
1
st
MF：51.65MHz 2
nd
MF：450kHz
Working Voltage
7.5V cathode Grounding
Working
Temperature
-25 ~ +55℃℃
Antenna
50Ω
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