Speed sensors with dual Archer RXs

[ululi1970]

I have a a warbird (20cc gas) with the following setup:
Radio X10S running OTX (2.3.15)
SR10 Pro as main receiver in the fuse.
M+ as backup receiver in the wing. Feeds into SBus in of SR10 Pro.
ASS-70 to measure airspeed, connected to S.Port in of SR10 Pro.
Both RXs have the latest 2.1.10 version of firmware

Two problems:
1) Sometime I lose the Airspeed data during flight. I suspect that it happens when, for whatever reason, telemetry switches to M+. Is there a way
to prevent that from happening? In the ACSST days, I would just bind the redundant receiver with telemetry off.
2) During the second flight, I had one "low RSSI" warning and one "critical RSSI" warning. After the critical warning, I decided to land.
I did not notice any loss of control, and after landing I performed a range test. With the plane on a bench, I was able to walk 100 m (>300 ft) before
the signal triggered warnings (in range check mode). So I am wondering what could trigger the low/critical RSSI.
The model was not that far when the warnings were issues, clear visual range and the RF noise is pretty low at our field. Could it be that it was reporting the telemetry from the M+?
Do we know how the ISRM module decides which RX's telemetry to display? As a matter of fact, why not displaying both telemetry streams? Both
RXs are broadcasting telemetry anyway. I should say that the M+ telemetry was set to 25 mw.

 

[HENNY]

RSSI is not the same as a range check. The signal reaching the receiver in the model can be reduced or blocked by many factors. The most common problem is due to receiver antenna positioning. Antenna tuning can also be affected by nearby metal parts, battery packs, carbon fiber fuselage etc. So for me the best practice to route the antenna,s one either side of your model away from all the above components. Also 2.4g signal is easily reduced if flying near trees that have wet or high moister content in their leaves. 2.4g can also have reduced signal if the model is on damp ground, hence the need to range check with the model at least 1 meter above ground. The last is the human body with its high water content blocks the signal path to the model a sudden RSSI issue can also occur.