PT260 Service Manual
15
7.2 Rx Part
Usable sensitivity (12dB
SINAD)
0.25V
Squelch On sensitivity 0.18uV @ squelch level 3
Rx residual output -45dB
Rx modulation bandwidth ±7kHz
Adjacent channel selectivity 65dB
Intermodulation rejection 60dB
Spurious response rejection 60dB
Audio output power Internal speaker: 500mW,
balance @ distortion 5%，8
External speaker: 125mW,
imbalance @ distortion 5%，
8
Rx current consumption 250mA
Standby current (Average) 20mA
7.3 Tx Part
Tx power 4.5W @7.4V DC
Frequency stability ±2.5×10-6
Max. modulation deviation ±5kHz
Modulation sensitivity 12mV
Modulation distortion
（300-3000Hz）
3%
Adjacent channel Tx power -70dB
Spurious Tx -70 dB
Residual FM -45 dB
Tx current consumption 1.8A @ 7.5V DC
Chapter 8 Troubleshooting
No. Problems Causes and solutions
1 Power On
failure
A. The batter pack may be out of power.
Please charge it or change a new one.
B. Power switch in failure. Change a new
one.
C. CPU in failure. Change the IC.
D. Zener diode is broken. Change a new
IC.
2 Cannot talk to
or hear other
radios
A. The frequency of the radio’s current
channel is not the same as that of the other
radio. Please reselect a channel.
B. The CTCSS/DCS is not the same.
Please reset it.
C. The radio is out of the effective
communication range.
3 No signal A. The antenna is in poor contact. Please
fasten it.
B. The HF amplifying tube is broken.
Please change it.
C. The squelch level is too high, so that
the squelch cannot be open. Please
reset the squelch level.
4 The indicator
lights red
while
transmitting,
but no voice is
heard by the
recipient.
A. The power amplifying tube Q11 is
broken, and no power is output. Please
change it.
B ． The microphone is broken. Please
change it.
5 The indicator
lights green
while
receiving, but
no sound is
heard.
A. The speaker is broken. Please change it.
B. The audio power amplifier is broken.
Please change it.
6 The
programming
is abnormal.
A. The programming cable connection is
wrong. Please check the cable
connection.
B. The Computer’s RS-232 serial port
output is abnormal. Please check the
computer.
C．The earphone/microphone jack of the
radio is in poor contact. Please check the
jack. If it is abnormal, please change it.
Chapter 9 KBC-260 Charger
9.1 Operating Conditions and General Specifications of the
Charger
a) Battery type: Li-ion battery (2*3.7v), battery capacity
1~2.4AH.
b) Adapter specifications: DC11V~16V, 500~1500mA,
voltage (Standard configuration): 12V.
c) Input current (Without battery): ≤15mA
d) Pre-charge charging current: 75mA±10mA
e) Pre-charge time: 15Min
f) Constant charging current: 400mA±40mA
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