TBS Crossfire Manual
● RSSI at 1m = -16dBm
● Rssi at 2m = -22dBm
The Crossfire can go down to -130dBm before the link breaks up. If you use RSSI as sensor by the channel/
output map menu or as OpenTx telemetry sensor, it will be shown like this:
● -0.1dBm = 100%
● -130dBm = 0%
SNR
Signal-to-Noise ratio
It shows you the ratio between the received noise and your Crossfire signal.
To judge RSSI properly you need to know the SNR and compare it with your RSSI value. The Crossfire can
receive signals in the noise down to -6dB.
Excample:
A RSSI of -80dBm is fine. But with a SNR of -2dBm it’s really bad.
Positive numbers mean the Crossfire signal is “louder” than the noise,
negative Numbers mean the noise is louder than the Crossfire
Warning levels
What should i use in my OSD or radio
The easiest way to set up your OSD or radio warning is by using LQ. It is linear which makes it easier to
monitor for most of the people, while RSSI got a logarithmic scaling which makes it drop rapidly at the
beginning and then slower the further you go.
Sensor
Prewarning
Critical
RSSI
30% / -100dBm
20% / -106dBm
LQ
70% (BF: 1:70)
60% (BF: 1:60)
LQ fixed 150Hz
40% (BF: 2:40)
30% (Bf: 2:30)
RSSI/ LQ
30%
20%
SNR
4dB
0dB
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