Range Test Mode
The JR module has a power option of 16uW (0.000016W, or -18dBm). This mode is ideal for range
testing.
Place the transmitter on (ideally) a non-conducting object, in the RF mode that you wish to test, with
Transmitter power set to 16uW.
Power up the receiver, with antenna attached, and walk away from the Tx until the LED starts
blinking erratically, and eventually stops blinking.
Measure that distance, and multiply it by approx. 148x to get the range on full Tx power 350mW.
I.e. Range on 16uW = 100m, full range is 100 * 148 = 14.8km
Note: the 148x number comes from the difference in power between 16uW, and 350mW, in dB, of 43.44dB.
Each 6dB increase in power results in double range, so 43.55dB corresponds to a range increase of 148x.
After testing, remember to restore the Tx power back to the normal setting (typically 100mW)
before flying to avoid any unnecessary surprises.
ImmersionRC Limited, Kwai Chung, NT, Hong Kong, www.immersionrc.com
