TBS Tracer Manual
SNR - Signal-to-Noise ratio
It shows you the ratio between the noise floor and your Tracer signal.
To judge RSSI properly you need to know the SNR and compare it with your RSSI value. The Tracer can
receive signals in the noise down to 0dB, as the SNR is already scaled to offset the modulation
requirement of 6dB.
Example:
A RSSI of -80dBm is fine. But with a SNR of 2dBm it’s really bad. This means the noise floor is at -82dBm
Positive numbers mean the Tracer signal is “louder” than the noise,
negative numbers mean the noise is louder than the Tracer
Warning levels
Sensor
Prewarning
Critical
RSSI
Use SNR
Use SNR
LQ
None
50%
RSSI/ LQ
30%
20%
SNR
4dB
0dB
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 has a logarithmic scaling which makes it drop rapidly at the
beginning and then slower the further you go.
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