Freetalker R8 User manual

TURN-UP INFORMATION
MODEL: R8
1. TRANSCEIVER SETTING
A) Power Supply: By using three pieces of AAA size battery, the nominal power supply voltage is 3.6V, the operating voltage
can be ranged from3.3V to 4.5V.
B) TX/RX Channel Setting：
Press and hold the MENU PWR key for 3 seconds to switch on the transceiver. At standby mode, the primary digit displays
the channel number and supplemental digit displays the CTCSS / DCS number.
Press the MENU PWR key one time, the CH will flash, then press or to select the Channel and press PTT to
confirm and back to receiving mode interface.
C) CTCSS/DSC Number Setting
Press the MENU PWR key two time, the sub-channel will flash, then press or to select the CTCSS or DCS and
press PTT to confirm and back to receiving mode interface. Press and hold the MENU PWR key for 3 seconds to switch off
the transceiver, press PTT key to confirm and back to receiving mode interface.
2. TRANSMIT
A) Press and hold the “PTT”button while speaking at about 5cm from the microphone for transmission. LCD will display
out TX icon. Release the “PTT”button to return to standby mode.
B) Press the MENU PWR key one time to enter into channel selection sub-manual, and short press MENU PWR key three
times to enter into VOX(voice-operated transmission) sub-manual,
Use or to select OFF & the desired VOX level ( OFF –03). Without pressing the PTT button, the voice
signal can be transmitted through the microphone.
3. ADJUSTMENT DESCRIPTION
The transceiver can be adjusted manually , Manual adjustment procedure for R8 is summarized as follows.
A) Instrument Lists:
Radio Communication Test Set(HP8924C) „„„„„„„„„„„„„1 set
15V/2A DC Power Supply„„„„„„„„„„„„„„„„1 set
multimeter „„„„„„„„„„„„„„„„„„„„„1 set
B) Preparation for tuning the transceiver
i. Before attempting to tune the transceiver, connect the device under test (DUT) to a 4.5V DC power supply.
ii. Whenever the transmitter is tuned, the antenna port of DUT must be connected to a 50Ωdummy load iii. The speaker
output must be terminated to an 16Ωdummy load and connected to a Radio Communication Test Set(HP8924C) at all
times during tuning.
C) Adjustment Procedures
i. Common Section
C) Adjustment Procedures
i. Common Section
Item
Condition
Measurement
Adjustment
Specification/Remark
s
Test Instrument
Terminal
Part
Method

1.Power
supply
1.Power supply
voltage DC4.5V
15V/2A DC power
supply
BAT+&BAT-
ii.Receiver Section
Item
Condition
Measurement
Adjustment
Specification/Remark
s
Test Instrument
Terminal
Part
Method
2. Sensitivity
1. RX low
Channel
Radio
Communication
Test Set Signal
Generator
i. Output: ≤
-119dBm
ii. Modulating
signal: 1KHz
iii. Frequency
Dev: ±1.5KHz
Antenna port: RF
I/P
Speaker Jack: Audio
O/P
with 16Ωdummy
load
Check
SINAD: 12dB or
higher
2. RX center
channel
3. RX high
Channel
Distortion
4.Audio
power
1. RX center
channel
Radio
Communication
Test Set Signal
Generator
i. Output: -60dBm
Antenna port: RF
I/P
Speaker Jack: Audio
O/P
with 16Ωdummy
load
Check
Audio Distortion ≤
5% @ 0.05W
Audio power
output > 0.2W
iii. Transmitter Section
Item
Condition
Measurement
Adjustment
Specification/Remark
s
Test Instrument
Terminal
Part
Method
5. TX
Frequency
Error
1.TX center
channel
Radio
Communication
Test Set @ TX
Mode
Test Set is
connected
to antenna port of
DUT
Error
≤±200Hz
6. TX Power
1.TX power
- Radio
Communication
Test Set @ TX
Mode
- multimeter
Test Set is
connected
to antenna port of
DUT
Adjust it to :
RF PWR ＜
0.5W l≤
350mA
Check RF power
level
7. Max.
Frequency
Deviation
1.TX center
channel
Radio
Communication
Test Set @ TX
Mode
FILTER:
0.3-3.4KHz
AF O/P:1KHz
100mV
‘- Test Set is
connected
to antenna port of
DUT - AF O/P is
connected
to MIC Jack with 2K
Ω
dummy load
Check
deviation at
＜2.5KHz
2. TX low
channel
3. TX high
channel

8.
Modulation
Sensitivity
1. TX center
channel
Radio
Communication
Test Set @ TX
Mode
FILTER:
0.3-3.4KHz
AF O/P:1KHz
12mV
’- Test Set is
connected
to antenna port of
DUT
- AF O/P is
connected
to MIC Jack with 2K
Ω
dummy load
Check
deviation:
1.2KHz-1.8KHz
Check
9.
Modulation
Distortion
≤5%
10. CTCSS
Frequency
Deviation
1. TX center
channel
Radio
Communication
Test Set @ TX
Mode
FILTER LPF: 300Hz
Test Set is
connected
to antenna port of
DUT
Adjust
deviation to
0.3KHz ±
0.2KHz
11. CDCSS
Frequency
Deviation
2. TX center
channel
Radio
Communication
Test Set @ TX
Mode
FILTER LPF: 300Hz
Test Set is
connected
to antenna port of
DUT
Adjust
deviation to
0.3KHz±
0.2KHz
Tune-up Power Range
Description
Tune-up Power (dBm)
Tune-up Power Range (dBm)
FRS
19.60 ± 0.7
18.90 ~ 20.30
GMRS
19.70 ± 0.6
19.10 ~ 20.30