(03-23-2025, 12:10 AM)XPS Wrote: 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.