Recently I replaced a dead FC in my iFlight Chimera 7 with a Matek FC, after which I found that my quad kept showing a rather weak RSSI when connected to my Tango II. For example it would show only 70% in the OSD when the quad was 1m away, then would rapidly drop to under 30% when it was only a few hundred meters away. The Tango 2 would give me voice warnings of critically low reception, while the DJI VTX was still running at 50MB/s. Needless to say I wasn't getting the range I expected from Crossfire. My quad went into failsafe several times, usually less than 1km away, before I found this solution. 

Firstly, you need to have your receiver working on 12 channels. Here is a guide on how to do that. 

Next, assign the RSSI signal to one of the unused Aux channels. Channel 11 corresponds to Aux7. 

To assign the RSSI signal to Ch11/Aux7, do the following:

1. Power up the quad and the RC so they connect
   
2. press and hold the MENU button on the RC, select the Crossfire menu, then "XF Nano RX" 
   
3. Scroll down until you find "Dst.Ch.11", click on it and scroll until you get "RSSI" and save it. 
   
4. In Betaflight, open the Receiver tab. Under "RSSI Channel" Select "Aux7".
   
5. Aux7 should now show the maximum 2000, which corresponds to 100% RSSI
   

Having the correct RSSI in Betaflight is important, because you want to be certain that failsafe will only activate when the FC loses contact with the RC, not before.

What version of BF are you running as since BF 4.2 you dont need to feed RSSI via a separate aux channel anymore. Betaflight picks it up automaticaly from the RX telemetry.

Your RSSI setting in Betaflight has nothing to do with whether the link fail-safes or not. That is, the RC link will still function if Betaflight is not receiving any RSSI telemetry at all.

If you were seeing low RSSI before and failsafing that was due to a problem with your link, eg antennas, interference, etc. You should trust the RSSI that is being reported and sort out what the issues are.

RSSI is useless with Crossfire and I honestly don't even know why TBS still provide it as an option. You should only be using LQ and RSSI dBm values to determine the health of your RC link.

(27-Aug-2023, 01:50 AM)SnowLeopardFPV Wrote: RSSI is useless with Crossfire and I honestly don't even know why TBS still provide it as an option. You should only be using LQ and RSSI dBm values to determine the health of your RC link.

OK so what in your view is the best configuration in the remote and in Betaflight?

You dont need to configure anything in the tango 2. Just put LQ and RSSI dbm in your dji OSD. With current versions of BF that is now possible.
The only thing extra (optional) i do in the tango 2 is setup a low rssi dbm alarm, but that is more advanced programming of the tango 2. There are a few yutube videos for that. But its optional as you get it already in your OSD

(27-Aug-2023, 07:15 AM)fpvapnea Wrote: You dont need to configure anything in the tango 2. Just put LQ and RSSI dbm in your dji OSD. With current versions of BF that is now possible.
The only thing extra (optional) i do in the tango 2 is setup a low rssi dbm alarm, but that is more advanced programming of the tango 2. There are a few yutube videos for that. But its optional as you get it already in your OSD

this is very good information thankyou..