This Open Source UHF booster uses Mitsubishi RA07M4047M RF ampifier for generating 7W or 3.5W selectable deadly RF power. (old v1 bossters have only one power mode)

The output power is configurable by supply voltage or jumper . It starts boosting from 3.7v(0.8W) to 9v(10W).  You can supply it with 2S lipo (7.2-8.4v) battery and it gives 6-8W RF depends battery voltage.

Our New v2 Boosters have selectable gate voltage with jumper. 
It's including a zener(3.3v) and a blue LED(2.75v) on gain input.

The booster works on 1/2 power mode with jumper and blue LED indicates this mode. 
If you need full power, just remove the jumper. The blue LED will stop and gain voltage will be 3.3v with zener diode. 
You can solder a switch these pins for selecting the modes in flight.
For example; you can fly with 1/2 power mode and switch to full power mode in case of emergency. 

We are suggesting 2S LiPO batteries for supplying your booster. 
The booster will give 7W in full mode and 3.5W in half mode with this battery. 

You can see it's power on this video. LED blinking from 3 meter away without any battery.

You can use it with all UHF systems as DragonLink.

Please read the amplifier chip's datasheet for detailed information about voltage, power, frequency informations.

Notice for OpenLRS users:
Output power of OpenLRS Tx is 100mW and our booster requires 50mW input. Please switch your Tx to 50mW mode before connecting the booster. Yu can find the details into the config.h file of OpenLRS project. 

Documents:

• Schematic
• Data Sheet (RA07M4047M)
• Our Forum Page about OpenLRS

To avoid Damage to your Booster, Please read the important warnings below.

• Never turn on your Booster without the antenna attached, this can burn it out !!! 
• Don't supply with higher voltage than 9volt. 
• Use it only with suggested input power. RA07M4047M's input accepts maximum 20dbm (~100mw). If you want to use it with 500mW systems (as dragon link) you should select the 500mW version when you order. We will add an attenuator on input for protecting your Tx and Booster.   
• If you want to use it with monopole stick antennas, dont forget the grounding the system. 
• Don't remove the heatsink before reading "RECOMMENDATIONS and APPLICATION INFORMATION" section of RA07M4047M datasheet.