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+----- Thread: RF module for spectrum? (/showthread.php?tid=151)
RE: RF module for spectrum? - erhard52 - 03-14-2026
(03-14-2026, 11:06 AM)flyingw Wrote: I looked in the Spektrum manual for the SPM4651T receiver and saw that the connector has +5v, GND, Signal and no connection. It's just three connections. Make an adapter that puts the wires into a servo plug to connect to the X10.
The X10 manual says that it can be configured to take Spektrum Satellite protocol as an input signal. I would do that first.
I have never used Spektrum equipment before, but I imagine that you first have to tell the TX16's 4n1 module to talk Spektrum protocol. Then connect the receiver to the X10 and put the receiver into bind mode by powering up the X10. The X10's instructions cover that part, but I do not know the specifics on how to bind a Spektrum receiver and transmitter.
thanks again or checking
right one wire is no connect.
thanks, will try to configure one x10 for spektrum and the proper tx16s -
on the side:
quite a pain to even convert the mechanical mode 2 to mode 1 - this should be easy these days but no, and these are the CNC upgrade gimbals for $140.
2 screws which are supposed to be accessible through the back cover cannot be accessed because the hole is misaligned to the screws so need to remove the back cover -
anyways just a side issue which seems to be part of our hobby
RE: RF module for spectrum? - erhard52 - 03-15-2026
ok i was able to bind the radiomaster R88 to the TX16S (now that should not be a surprise) but is also was able to bind the SPM4651T.
i have not modified the x10+ yet to understand the spektrum protocol
i also fixed the conversion to the mode 1 after opening up the back plate - kind of sad that they misplaced the opening holes. funny under one stick they have the misplaced holes and under the other stick they have no holes at all but one needs to modify the motion friction on both sticks - go figure. maybe i am the only one in the world need to do that
RE: RF module for spectrum? - flyingw - 03-15-2026
Erhard,
Good luck with your setup, and please let us know if it works with the X10.
Paul
RE: RF module for spectrum? - erhard52 - 03-15-2026
(03-15-2026, 09:24 AM)flyingw Wrote: Erhard,
Good luck with your setup, and please let us know if it works with the X10.
Paul
Paul
today i was flying -all went well -the glider again with my old setup multiplex EVO and XPS transmitter module with RFU and x10+ in the glider AND i watched the LQI.
next to plane during launch LQI=100%
reasonably far away and high up for a 2m wing span and lowest LQI = 64
i think only drew would know how to judge this.
does 64 mean that 36% of frames are lost? how does this look on spektrum or other radios?
i am not even sure if the other XPS transmitter modules do have a LQI (link quality index) output?
all i can say i did not notice any dropouts. ok one could say a glider is more forgiving, yes probably , nevertheless i am happy all worked out
RE: RF module for spectrum? - erhard52 - 03-16-2026
(03-15-2026, 11:47 PM)erhard52 Wrote:(03-15-2026, 09:24 AM)flyingw Wrote: Erhard,
Good luck with your setup, and please let us know if it works with the X10.
Paul
Paul
today i was flying -all went well -the glider again with my old setup multiplex EVO and XPS transmitter module with RFU and x10+ in the glider AND i watched the LQI.
next to plane during launch LQI=100%
reasonably far away and high up for a 2m wing span and lowest LQI = 64
i think only drew would know how to judge this.
does 64 mean that 36% of frames are lost? how does this look on spektrum or other radios?
i am not even sure if the other XPS transmitter modules do have a LQI (link quality index) output?
all i can say i did not notice any dropouts. ok one could say a glider is more forgiving, yes probably , nevertheless i am happy all worked out
----------------------------
so far no luck with x10 and spektrum
this newer spm4951T accepts voltages up to 8V so no more need for modifying anything on the X10 or cable. i thought your photos showed X10 v1. anyways i have a v2 and just tried it but still no talking between x10 and receiver. receiver did bind to the tx16s. i only can think that the newer receiver only does the SRXL2 protocol and the x10 does not understand. i did order an hyperion spektrum receiver and will see if that works. i did set the X10 to the spektrum protocol (3).
RE: RF module for spectrum? - flyingw - 03-16-2026
Link Quality means the percentage of good control packets (new servo positions) out of all of the attempted control packets over some small period of time.
In your flight at some point your receiver was able to use 64% of the control packets. At that moment the system was operating with small gaps in the controls. As you said, with a glider it may not have been noticeable.
In chapter 7 "Set Spektrum Bind Mode" of the X10+v2 manual, it gives a procedure for binding a Spektrum satellite with the X10 in play.
RE: RF module for spectrum? - erhard52 - 03-16-2026
thanks - i did miss this last page - will try it
i think i am getting to the end of the rope and it is not working
i connect the spektrum satellite receiver to the x10 v2. the spektrum is already bound to the tx16s in DSMX 22ms mode.
i go to LED white - spektrum bind mode
select binding ode 3 flashed = DSMX 22ms.
the i power off the x10 and connected receiver - then power on and receiver binds again to the tx16s but x10 keeps blinking and no servo moves
so x10 and receiver do not connect
--
what i do not understand is this. i am setting all up for spektrum on the x10 and we know it doe not work in the end.
then when i reconnect my RFU to x10 v2 and turn on the multiplex with XPS module it immediately reconnects. it is as if the x10 was never programmed in the spektrum mode. how is this possible?
RE: RF module for spectrum? - erhard52 - 03-16-2026
(03-16-2026, 07:01 AM)flyingw Wrote: Link Quality means the percentage of good control packets (new servo positions) out of all of the attempted control packets over some small period of time.
In your flight at some point your receiver was able to use 64% of the control packets. At that moment the system was operating with small gaps in the controls. As you said, with a glider it may not have been noticeable.
In chapter 7 "Set Spektrum Bind Mode" of the X10+v2 manual, it gives a procedure for binding a Spektrum satellite with the X10 in play.
regarding link quality. when i talk to spektrum or other radio users they claim they seldom see frame loss reported during flying sessions. so what does that mean for my connection that is what i am wondering about.
clearly the moment i have a few meter distance it is less than 100%
RE: RF module for spectrum? - erhard52 - 03-16-2026
ok small success.
i used the radiomaster R88 which also has an SBUS futaba (non-inverted) output. connecting it to the x10+ v2 programmed to 2 flashes=Futaba SBUS WORKS!!!.
the R88 is a 8 channel receiver but still has an SBUS output.
so now i ordered the R81 v2 - satellite receiver which should work the same way.
the R88 is about 2x the size of the RFU so not ideal for tight glider fuselage space.
so this confirms that i probably did the programming right but the spm4951T just does not work with DSMX from the x10
update:
so far no crash with my sail plane but LQI routinely goes to the low 70%. i just did another set of experiment:
monitoring the LQI during range test. not sure why i did not try this one before
1. with TX antenna i only can walk away about 2m to got below 60% and connection degrades or breaks
2. with TX antenna about 20m
RE: RF module for spectrum? - flyingw - 03-19-2026
Erhard,
Your 60% link quality at link failure is uncomfortably close to your 70% flight result.
I've read about folks tuning their 4in1 units to improve the performance. The procedure is done right from the transmitter. I do not know how as I have never done it. Maybe that would increase your safety margin for the sailplane.
Paul