Transmitters (TX700 PRO)


RF Output power: 500mW/1000mW/2000mW

RF Output connector: BNC female

RF input: DIN 3

The transmitter power is user selectable via easy to access 3 way switch.

(We recommend using “low” power mode, so power up is possible in case of an out of range situation will occur)
The transmitter can handle full power, continually no time limit.
The antenna output is designed for 50 Ohm load; however the transmitter stage is specially protected and can handle full power at both open and shorted antenna.

It is normal to perform range check with antenna removed and 500mW setting.

The PPM input signal can be either constant frame repeat time, or variable, Positive or Negative polarisation. The special double speed Futaba PPM signal is also accepted, Auto detects and auto handle. The main PPM signal must contain from 4-12 servo channels, if main PPM signal has under 4ch it will be refused.

Note: Graupner call each way a servo travel for a channel, so in Graupner terms a 24 Channel setting handle 12 servos, and is what we call a 12 channel signal.


Height: 32mm
Width: 74mm
Length: 100mm
Weight: 280 gram


Supply voltage 5-25V for 500mW power
Supply voltage 6-25V for 500mW-1000mW-2000mW power
Supply power usage is 3 times the transmit power.

Supply current at 20V (500mW x 3 = 1.5W / 20V = 0.075 Ampere)
Supply current at 10V (500mW x 3 = 1.5W / 10V = 0.15 Ampere)
Supply current at 6V (2000mW x 3 = 6W / 6V = 1 Ampere)

Battery life

The TX unit draw about 1.5W as mentioned at 500mW out, to find the current it draw we use ohms law.

  • Examples: Watt / Supply Volt = Current, the supply voltage can be anything from 6-25V.
  • Example with a 3S lipo: 1.5W / 11V = 0.126A

To find the time you can run with a given battery size, take your battery mAh and divide with current usage also in mA. Example: 1000mAh / 126mA = 7.9 hrs, remember to keep a good safe margin, some batteries like LIPO do not like to be fully empty.

When using the power-up feature, input supply power will also go up. The unit has about 30-40% efficiency, so an easy rule is the input usage is 3 times as much power as the output power. At 2W RF out; the TX unit consume almost 6W, this means 4W is radiated as heat.

The TX unit can deliver 500mW out at only 5V as supply voltage; it will stop working at 3.3V or under.
For 1W and 2W output, you need supply voltage of at least 6V. Maximum is 25V!

Peak operating heat sink temperature -40C to + 80C
Suggested Operating heat sink range -20C to + 60C

PPM input, both main PPM and HT PPM, level 1.5Vpp to 10Vpp.

AC or DC coupled, this means it is also JR and Graupner student signal compatible. However for serious stable long range flight, it is recommended to use a 3-5V DC coupled PPM signal for best stable signal to noise margin.

Change unique ID code

Remove the top lit, inside the TX unit you find a DIP switch with 8 tiny white buttons, which can be slide up or down.

Note: The text ID code next to it. If you need to create a take-over mission, then the two TX units must have the same ID code to be accepted by the RX. If you need to fly side by side with a friend, just be sure you use different ID code. After ID code change, a new bind must be performed.