HQT TH-2800 User manual

TH-2800 Turn up procedure
It can either use PC program software or manual tuning mode to debugging TH-2800.The
Following method is the latter one. (see“TH-2800 function” , manual tuning mode ）。
1. Equipment:
1． One comprehensive tester
2． One scanner
3． One 3A/10V power source
4． One digital voltmeter
5． One 3A Ammeter
2. User Mode
Press PTT key to transmit, speak to the microphone with normal voice. Please
keep 2.5 to 5 center meters away from your mouth and the microphone.
Release PTT key when receiving.
3. Mode Setting
1. Short-circuit two points of SELF on PCB，turn on the radio, LED flashes red and
green in turns.
2. Choose channel according to its model.
3. Manual tuning function and wired clone function will be switched on
automatically.
4. Press PTT key, then set the current chosen channel, system initialization starts.
Note: Once the radio has been re-initialized, the pre-stored tuning data and channel
information (frequency, CTCSS/CDCSS) will be erased and some function may changes, too.
Therefore try to avoid this operation unless replacing E2PROM and other necessary setting.
4. Wired Clone Mode
(1) Press SK2 key on the source radio to turn on it, LED will then flashes twice in red
in 2 seconds, which means the radio entered wired clone mode.
(2) The target radio needs to be enabled with clone mode by pressing PTT key while
the main radio is still in the clone mode. To disable the clone function of the target
radio, press [PTT] key again and the indicator flashes red twice. The clone
function of target radio is disabled as default.
(3) Press SK2 key on the source radio, when the red light starts to flash it means it is
in the process of clone. When it is finished the red light goes off. If it’s failed, the
indicator flashes in green instead of red.
Note: The wired clone mode can be disabled through using programming
software.

5. Manual Tuning Mode
Manual tuning is aimed for adjust frequency deviation, power, sensitivity, and
noise elimination, etc.
Note: Before enter the manual tuning mode, read the radio settings into the
computer first using the programming software, and then go to program manual,
modulation mode, choose manual tuning mode, close current widow and write
in modulated setting from the computer to the radio. This will enable you to
enter the manual tuning mode.
(1) To enter the mode:
Press [PTT+Moni] to turn on the power, keep it in 2 seconds until LED flashes
twice in green, release to get into manual tuning mode.
No. Items CH No. Turning up procedure Work frequency
a、Switch to channel 1, power connected to 7.5V
b、Switch to channel 1, Power connected to 7.5V ,
Power on via Pressing [PTT] and [Middle key],
red light on
1 7.5V Voltage
calibration 1
C、Switch to Channel 16 in 4seconds,Calibration
successful when you hear long "Di"
Switch to channel 1 Press [PTT+MONI] to turn on
Green light on
b、switch to channel 16 in 3seconds
2 Manual turn up
Switch on/off 5 c、Press[PTT] or [MONI] for adjust，long”di”sound is on
short “di”sound is off
a、Switch to channel 8 Press [PTT+MONI] to turn on
Green light on
3 Initialization 8
b、switch to channel 16 in 3seconds.green light off
a、Switch to channel 10 Press [PTT+MONI] to turn on
Green light on
4 Aging program 10 b、switch to channel 16 in 3seconds.green light off
red light on ,enter to aging program
a、Switch to channel 11 Press [PTT+MONI] to turn on
Green light on
b、switch to channel 16 in 3seconds.green light off
c、Switch to
15 Tx Frequency
Deviation Press PTT increasing Press MONI decreasing
14 CTCSS
Deviation Press PTT increasing Press MONI decreasing
5
Communication setting
11
13 CDCSS
deviation Press PTT increasing Press MONI decreasing

a、Switch to channel 12 Press [PTT+MONI] to turn on
Green light on
b、switch to channel 16 in 3seconds.green light off
red light on
c、Switch to channel 16,ajust the high power
in low frequency
d、Switch to channel 15,ajust the high power
in high frequency
e、Switch to channel 14,ajust the low power
in low frequency
6 VHF Power
Adjust 12
f、Switch to channel 13,ajust the low power
in high frequency
a、Switch to channel 13 Press [PTT+MONI] to turn on
Green light on
b、switch to channel 16 in 3seconds.green light off
red light on
c、Switch to channel 16,ajust the high power
in low frequency
d、Switch to channel 15,ajust the high power
in high frequency
e、Switch to channel 14,ajust the low power
in low frequency
7 UHF Power
Adjust 13
f、Switch to channel 13,ajust the low power
in high frequency
a、Switch to channel 14 Press [PTT+MONI] to turn on,
Green light on
b、switch to channel 16 in 3seconds.green light off
Frequency:136.125MHZ
8 VHF SQL
Adjust 14
c、[PTT] is on，[MONI] is off，[MID] step:5MHZ
136.125MHZ
Step:5MHZ
a、Switch to channel 15 Press [PTT+MONI] to turn on,
Green light on
b、switch to channel 16 in 3seconds.green light off
Frequency:400.125MHZ
9 UHF SQL
Adjust 15
d、PTT] is on，[MONI] is off，[MID] step:5MHZ
400.125MHZ
Step:10MHZ

Maximum Output Power among production units
Max. tune-up tolerance power limit for Production Unit (dBm)
PTT/Mode VHF(MHz)
136.0125 143.0125 150.0125 160.0125 173.9875
Analo
g
-12.5
K37.78 37.78 37.78 37.78 37.78
Max. tune-up tolerance power limit for Production Unit (dBm)
PTT/Mode UHF(MHz)
400.0125 418.0125 435.0125 450.0125 469.9875
Analo
g
-12.5
K37.78 37.78 37.78 37.78 37.78