A self-help group for anyone having problems or indeed anybody that can help with FrSKY products.
I would appreciate a little help with installing the two receivers. The R8Pro is supplied with a 4-pole connector with flying leads for soldering to the R9MX.
The R8connections are marked:-
-ve black
AIN2 green
+ve orange
'S' white
The R9 MX has CH1 to CH4 solder points along one edge and six points along the end labelled:-
SBUS IN
SBUS out
Inverted S.Port
S.Port/F.Port
VIN
GND
I expect that orange (+v) is intended to be soldered to VIN and black (-ve) to GND
What other connections need to be made to achieve dual-band telemetry radio functionality?
The 4-wire connector to the R8 PRO markings look like this: -
The AIN2 green wire is concerned with voltage sensing so I guess does not need connecting to the 9MX
The marking for the white wire is a stylised 'S', I'm guessing it should be connected to the 9MX, but where? FrSHK are a bit coy on the subject.
The answer came from the FrSky ARCHER GR8 Receiver 'Instruction Manual' (Leaflet). The Introduction includes the statement : -
......In addition any SBUS equipped ACCESS receiver can be connected to the SBUS IN port turning it into a redundant receiver, the GR8 will automatically use the receiver with the best signal......
In my case I substituted the ARCHER R8 PRO receiver for the GR8, connecting the SBUS OUT port of the R9MX to the SBUS IN port of the R8 PRO and the TandemX20Sdual-band functionality was achieved.
dont suppose you have any pictures of the setup?? i want to use the stuff supplied in the combo pack but have no idea of how to wire it up
Hi Lee,
A standard servo lead is used to connect the SBUS IN port of the R8 PRO receiver to the SBUS OUT, VIN & GND connections of the R9 MX OTA receiver. The instruction manual (leaflet) for the R9 MX has a drawing in the Overview section which gives the location of these three connection points.
Many thanks Tom. I was struggling to work that out before seeing your post. Thanks, very useful.
@tomw thanks Tom, do i register and bind (with or without telemetry) the R9 MX before or after ?
I registered and bound the R9MX while it was hooked up to the other receiver
Lee, having connected the 900MHz receiver via SBUS to the 2.4MHz receiver, with the receivers powered go to the <Model menu and select the <RF System and work through the settings from the top to Register and bind the 2.4 MHz receiver and then the 900MHz receiver.
cheers guys i will do that
Just found this thread from google, just what I was looking for.
I'm just about to purchase the two rx's, Archer access GR8 and the R9 Access 900mhz, to take advantage of the vario in the GR8, but DB options.
Tom, with testing in the field, how has it gone?
The set-up has worked fine Steve, for almost 18 months.
There are now more Tandem rx's available which are simpler to install, but that original set-up is good for using any Archer rx's that would otherwise be confined to single band (2.4MHz only) applications. Currently Tandem rx's don't incorporate vario nor altitude sensors so the Archer + an R9 868MHz solves that issue.
Good to hear, thanks for the reply.
