RadioLink Electronic Limited
14
Chapter 5 Image Transmission of F121 Pro
The image transmission device of F121 Pro is 5.8G 25mW all-channel camera integrated image transmission. If
it’s the image transmission version purchased, the binding between F121 and the FPV screen has been done by
factory default. Pilots only need to power both on before flight.
The default transmission power is 25mW. Available power among 25mW,100mW and 200mW can be changed
by pressing the button on the camera. More instructions about setting the power, please visit
for detailed manual.
Note
As device of image transmission includes transmit and receive, the distance could be influenced by the
gain of transmit and receive.
Definition of the image transmission LED indicator
①
Both RED and BLUE LED always on means normal working status.
②
If RED LED is always on while BLUE is off, meaning it’s at PitMode. That is, transmission off. The
transmission distance is 1-2m. It’s advised to choose this mode if there are many people switching channels
simultaneously at the same space so that channels won’t get mixed.
Customize the power and the channel frequency
After powering on, wait for 10 seconds to initialize, both RED and BLUE LED always on means normal working
status. Long press the channels/power switching button, the frequency, the band and the transmit power will
recycle.
Table of Band/Frequency
Frequency Selection:
L
ong press the channels/power switching button for 5 seconds, the RED LED flashes
once means entering the frequency selection mode, then short press the button again to change the frequency.
Band/Freq
1
2
3
4
5
6
7
8
A
5865M
5845M
5825M
5805M
5785M
5765M
5745M
5725M
B
5733M
5752M
5771M
5790M
5809M
5828M
5847M
5866M
C
5705M
5685M
5665M
5645M
5885M
5905M
5925M
5945M
D
5740M
5760M
5780M
5800M
5820M
5840M
5860M
5880M
E
5658M
5695M
5732M
5769M
5806M
5843M
5880M
5917M
F
5362M
5399M
5436M
5473M
5510M
5547M
5584M
5621M