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.

HQT TH-2800 Specifications

General

Frequency Range	400-470MHz
Number of Channels	16
Output Power	5W
Operating Voltage	7.4V
Battery	1500mAh (Li-ion)

Summary

Equipment Requirements

User Mode Operation

Transmit and Receive Procedure

How to transmit using the PTT key and speak into the microphone at a specific distance.

Mode Setting Configuration

Initialization and Mode Switching

Steps for short-circuiting PCB points, powering on, and setting up modes like manual tuning and wired clone.

Wired Clone Mode Transfer

Source and Target Radio Setup

Procedure to enable wired clone mode on source and target radios and initiate data transfer.

Manual Tuning Mode Guide

Entering Manual Tuning Mode

Steps to enter manual tuning mode by pressing PTT+Moni and observing LED flashes.

7.5V Voltage Calibration

Procedure for calibrating the 7.5V voltage supply, involving channel selection and power-on sequences.

Manual Turn Up Switch On/Off

Steps to switch the radio on/off in manual tuning mode, involving channel selection and adjustment.

Initialization Procedure

Procedure for initializing the radio within manual tuning mode, involving specific channel and power-on sequences.

Aging Program Setup

Steps to enter and configure the aging program, involving channel selection and observing indicator lights.

Communication Setting Adjustments

Adjusting Tx Frequency, Deviation, CTCSS, and CDCSS deviation using PTT and MONI buttons.

VHF Power Adjustments

Procedure to adjust VHF power levels (high and low) across different frequency bands.

UHF Power Adjustments

Procedure to adjust UHF power levels (high and low) across different frequency bands.

VHF SQL Adjustments

Steps to adjust the VHF squelch (SQL) level using channel selection and button presses.

UHF SQL Adjustments

Steps to adjust the UHF squelch (SQL) level using channel selection and button presses.