RF module for spectrum?

[erhard52]

i am not sure if this entire forum thing here is dead and useless (sad) but i post anyways.
i got the RF module from XPS way back to convert my multiplex EVO pro 16 to XPS. 
so i wonder if the XPS model can be programmed or used for the spectrum DSM or DSM2 receivers?

i sort of miss jim's personal replies and expertise - how well things change, look at our country (US)

thanks
erhard

[XPS]

Every brand 2.4GHz system has their own proprietary RF protocol. Nothing is cross compatible.

[erhard52]

Every brand 2.4GHz system has their own proprietary RF protocol.  Nothing is cross compatible.

i don't know why i still bother with XPS - oh yes i have  a lot of XPS hardware.

i do have the XOS transmitter module in the multiplex evo .
i setup my new glider and i noticed some servo motion lag.
spending hours i come  with AI to the following conclusion

even when i successfully link to the RFU/x10 my transmitter module flashes fast green and Ai tells me it is still in RANGE test mod. 
i do not seem to get out of this. is it broken - any trick?
i never notes this and now i think that is the problem for some of my crashes. yes i did range tests in the past and they seemed to work but know even within a few meters i have servo malfunctions.
so is my XPS module stuck in range test?

i tried to factory RESET it but that also does not work
any help or anyone has a leftover XPS module for multiplex - i know unlikely - maybe time to switch

found this one:
The 10 kΩ pull-up “fix” is not an official recommendation from Xtreme Power Systems. You generally won’t find it in the official manual for the XPS 2.4 GHz RF Module used with the Multiplex EVO transmitter.

Where it actually comes from

The pull-up resistor solution comes from user installations and RC forum discussions, not factory documentation. It was discussed in places like:

RC Groups forum threads about XPS EVO conversions

Older DIY installation guides written by modelers

Some conversion notes from installers who integrated the internal module into the EVO

The reasoning behind it is straightforward electronics:

The range-test input pin on the XPS module is active-low.

If the pin is left floating, electrical noise can pull it low.

A ~10 kΩ resistor to Vcc forces a stable logic HIGH, preventing accidental range-test mode.

That’s why people add the resistor when they notice the fast blinking LED + short range symptom.

[erhard52]

Every brand 2.4GHz system has their own proprietary RF protocol.  Nothing is cross compatible.

i don't know why i still bother with XPS - oh yes i have  a lot of XPS hardware.

i do have the XOS transmitter module in the multiplex evo .
i setup my new glider and i noticed some servo motion lag.
spending hours i come  with AI to the following conclusion

even when i successfully link to the RFU/x10 my transmitter module flashes fast green and Ai tells me it is still in RANGE test mod. 
i do not seem to get out of this. is it broken - any trick?
i never notes this and now i think that is the problem for some of my crashes. yes i did range tests in the past and they seemed to work but know even within a few meters i have servo malfunctions.
so is my XPS module stuck in range test?

i tried to factory RESET it but that also does not work
any help or anyone has a leftover XPS module for multiplex - i know unlikely - maybe time to switch

found this one:
The 10 kΩ pull-up “fix” is not an official recommendation from Xtreme Power Systems. You generally won’t find it in the official manual for the XPS 2.4 GHz RF Module used with the Multiplex EVO transmitter.

Where it actually comes from

The pull-up resistor solution comes from user installations and RC forum discussions, not factory documentation. It was discussed in places like:

RC Groups forum threads about XPS EVO conversions

Older DIY installation guides written by modelers

Some conversion notes from installers who integrated the internal module into the EVO

The reasoning behind it is straightforward electronics:

The range-test input pin on the XPS module is active-low.

If the pin is left floating, electrical noise can pull it low.

A ~10 kΩ resistor to Vcc forces a stable logic HIGH, preventing accidental range-test mode.

That’s why people add the resistor when they notice the fast blinking LED + short range symptom.

oh someone is reading my gibberish - sorry lot's of stuff from AI is really not right but here we go

i ordered a radiomaster T16s with 4 in 1 module. so this can work with spektrum receivers and the eflite planes.
i would love to keep using the x10+ in my other planes and just replace the RFU with another satellite receiver
it is confusing because some seem to need a 3.3V cable and others AI says might not work with X10+ if i have an older FW and not 2.0 - how do i know which FW i have ?
can the XDP tell me?
AI says the blinking LED when powered on tells me but not true it just bling red and when i turn on the transmitter it is solid  green.

oh and from above post. should the XPS module in my multiplex be solid green or is the fast green flicker ok?
based on checking the LQI number the blinking has nothing to do with normal mode or range test mode

thanks
erhard

oh, i need to add. by checking the user docs i do have the x10+ v1 - i only have one serial port input

i am just reading the x10+ v1 manual and i forgot how flexible that is - compliment to jim!
so i can get already 3.3V for a spektrum satellite receiver and the binding can be done too.
i guess the cable for the voltage reduction is no where to find anymore

now all i need is find the proper spektrum satellite receiver and then i can use my radiomaster transmitter with the 4-in-1 module.

[flyingw]

The X10 with a Spektrum satellite receiver should be a good setup. I use X10s in many of my airplanes and I like the ability to locate the receiver out of the way of other parts and equipment in the airplane that could block the signal in certain orientations.

Also, if your RadioMaster T16 can transmit ELRS, then you may be able to take advantage of a nice capability coming in the future. XPS have proposed a new X10+v3 that could support the CRSF protocol as a serial input (like the existing X10s take Xtreme or SBUS as an input). CRSF is the serial protocol that ELRS receivers use to talk to flight controllers.

[erhard52]

The X10 with a Spektrum satellite receiver should be a good setup.  I use X10s in many of my airplanes and I like the ability to locate the receiver out of the way of other parts and equipment in the airplane that could block the signal in certain orientations.

Also, if your RadioMaster T16 can transmit ELRS, then you may be able to take advantage of a nice capability coming in the future.  XPS have proposed a new X10+v3 that could support the CRSF protocol as a serial input (like the existing X10s take Xtreme or SBUS as an input).  CRSF is the serial protocol that ELRS receivers use to talk to flight controllers.

the nice thing about the radiomaster seems the flexibility of RF modules - i ordered the 4-in1 because of the spektrum compatibility but it can be replaced with the ELRS module.
i am confused i thought XPS is shut down?

so you are still using the XPS and RFU? what transmitter?
i really liked my mutliplex evo but when i set it up for the GT2000v2 glider with flaps i realized that the slider potentiometers did not work smoothly anymore - so i used contact spray which improved it but maybe at 20+ years old this is to be expected especially they were rarely used. i surely liked the programmability of the EVO.

[erhard52]

i wonder if XPS would share their protocol - that would be nice

. The Native Limitation
The XPS RFU uses Extreme Power Systems' proprietary Xtreme hopping protocol.Spektrum Transmitters: Use DSM2 or DSMX protocols. They cannot "talk" to an XPS receiver because the hardware and software encoding are completely different.RadioMaster Transmitters: While the RadioMaster "4-in-1" module supports over 70 protocols, XPS is not one of them. The CC2500 and CYRF6936 chips inside the RadioMaster do not currently have a public firmware bridge to the XPS Xtreme protocol.

[flyingw]

Erhard,

I still use XPS transmitter modules and receivers, including original 8-channel, Nanos, and RFUs. I've got X10 and RFU setups in several of my airplanes too. One airplane has an X10 and Nano Rx.

I use a Futaba 9C and a Taranis X9D, both with XPS transmitter modules. I recently bought a RadioMaster TX15 transmitter to learn ELRS and EdgeTx. the TX15 has a JR-style RF module bay and EdgeTx supports PPM and XJT out of the external module bay so I could also use it with the XPS-J1 transmitter module.

Paul

[erhard52]

Erhard,

I still use XPS transmitter modules and receivers, including original 8-channel, Nanos, and RFUs.  I've got X10 and RFU setups in several of my airplanes too.  One airplane has an X10 and Nano Rx.

I use a Futaba 9C and a Taranis X9D, both with XPS transmitter modules.  I recently bought a RadioMaster TX15 transmitter to learn ELRS and EdgeTx.  the TX15 has a JR-style RF module bay and EdgeTx supports PPM and XJT out of the external module bay so I could also use it with the XPS-J1 transmitter module.

Paul

thanks Paul
so you are fully invested in XPS - good.  i just ordered the radiomasterT16s.

i really like XPS too but lost sort of confidence with the transmission range. XPS suggests to remove the transmitter antenna for the range test and then walk away 50 feet. i cannot remove the antenna. it does not just unscrew like router or other 2.4GHz antennas. anyways if i walk away maybe 50ft and put my body in between the servos respond erratic. with antenna XPS says one would need to walk away 300 ft. so what is wrong.
as i said my transmitter LED n normal connection always flickers fast green which according to AI indicates range test mode.
can you please tell me if yours is solid green in normal use? that would help me a lot. if yours is solid green and mine is flickering then something is really not right

erhard

[flyingw]

I just tested on the bench and both my Futaba 9C with the XPS-F1 transmitter module and my Taranis with the XPS-J1 transmitter show a rapidly flickering green led when in normal operation connected to a receiver.

When I press the range test (prog) button on the transmitter module, the led turns solid red. when I release the button it goes back to flickering green.