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Dec 05, 2017, 07:07 PM
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TBS Crossfire Link Quality (LQ) Taranis Call Out Warnings


TBS Crossfire Link Quality (LQ) Taranis Call Out Warnings
A how to on youtube

First up why LQ and not RSSI, well LQ is Link Quality and it gives you a better representation of the RC link than the RSSI (received signal strength indicator) RSSI values don't take noise floor into consideration so you've never really got an accurate measure of your link by just looking at RSSI

RQly is the Link Quality value
RFMD is the crossfire link mode
0 = 4Hz
1 = 50Hz
2 = 150Hz
When RFMD in in 150Hz mode (2) LQ does not matter and does not need to be monitored.

Logical Switches:
L01: Monitors the Crossfire frequency mode, it then activates when RFMD is NOT in 150Hz mode
L02: Active when LQ is less than 80% and not in RFMD 2 mode, (a pre warning)
L03: Same as L02 but with the critical warning level at 70%
70% is considered the critical level for LQ
The 0.5 is a delay so that you not getting warnings when you get a quick drop in RF

Special Functions:
This does the actual call out to the speaker
SF01 will play sound "RF Low"
SF02 will play sound "RF critical"
The !1x means it wont play at startup
Check your LQ indicator ("Link Quality") to assess your link's health in regards to closeby external interference. The LQ goes from 0% (no signal) to 100% (full signal). Any value above 80% can be considered safe to fly, large drops below that indicates you are reaching the limits of your radio link. Also check your SNR indicator ("Signal to Noise Ratio") for your margin above the noise floor (far away external interference). The CROSSFIRE's LQ will deteriorate once the SNR reaches 0. Anything above 3 is good. The theoretical limit is -6dB. The RSSI indicates the signal strength of the antenna on the frequency that it is listening on. A high RSSI and low LQ indicates high interference, a high RSSI with high LQ indicates very good noise conditions. The RSSI goes from +10 to -130, in a logarithmic scale, with every further 6dB reduction indicating a doubling of your existing range.
https://www.youtube.com/watch?time_c...&v=-evvSJBAe8I
Last edited by yosemitez; Dec 06, 2017 at 11:38 PM.
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Jan 05, 2018, 05:44 PM
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Thanks for writing this down!
Feb 17, 2018, 03:13 PM
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Any info on when to use Link Mode 1 or 0? Mine is defaulting to 2 (150Hz) so I don't suppose I'll be getting warnings from LQ.
Feb 19, 2018, 09:55 AM
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Quote:
Originally Posted by MojoPapi
Any info on when to use Link Mode 1 or 0? Mine is defaulting to 2 (150Hz) so I don't suppose I'll be getting warnings from LQ.
It switches automatically as the link quality deteriorates. You shouldn't therefore ever need to alert when running 150hz (which is what L01 enforces in the example above).
Feb 25, 2018, 06:41 AM
because rust never sleeps....
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. . .
Last edited by HugoRogers; Mar 11, 2018 at 04:01 PM.
Mar 04, 2018, 02:20 AM
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Fantastic, thanks for the info. I had just been looking for a way to callout rssi, now I get why LA can be better.


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