User's Manual

TX400-72FM Radio Control Transmitter
Instruction Manuals
1. Summarize of circuit
The TX400-72FM transmitter is made up with High-Frequency (HF short for as
follows) circuit and Low-Frequency (LF short for as follows) circuit. Separately, the
HF part include RF Oscillation, RF Amplifier, Power Amplifier and Matched
Impedance Antenna circuit, and Modulation Signal Source, Shaping circuit are
included in the LF part.
This transmitter comprises 4 proportional control channels. P
1
~P
4
is the control pot of
each proportional channel. When different voltage being sent into correspondence
pins of MCU PIC16F676, the pin 5 outputs a pulse train used to modulating carrier
signal.
2. Electronic specification
● Operation frequency: 72.130~72.870MHz, 10 different frequencies in all and
stepped by 82.22KHz.
● Modulation degree: f
o
±3KHz (f
o
=Standard frequency)
● Output power: ≤1W
● Channel: 4 proportional
● Operation voltage: 9.6V
● Operation current: ＜180mA
3. Using guide
Ⅰ. As the picture 2 shown, installing 8 cell “AA” Nicd or NiNH battery into battery
case.
Ⅱ. Power on the transmitter, all 3 LEDS (from left to right: red, yellow and green)
illuminated until the battery voltage drops 9.0V, green LED goes dark at 8.6~8.9V and
yellow LED goes dark lower than 8.6V, it has to be charged at this time.
Ⅲ. As the picture 1 shown, 2 control sticks on the main board used operation form as
follows:
Left stick:
Up and Down is Throttle
Left and Right is Rudder
Right stick:
Up and Down is Elevator
Left and Right is Aileron
Every channel has a Trim Levers on the side of each stick.