Futaba 14 ch Rx reading

I had problems reading inputs with APM, see here.  I reloaded the PPM multiplexer firmware as indicated here but after that I got same problems.

I remembered then that some time ago I had to send a PowerBox back to factory due  problems reading Futaba 14 Ch RX. The reason was that some first released R6014FS Rx's have 2.7 V servo signal instead of the standard 3 V. PowerBox changed the reading threshold to the 2.7 V signal and voila.

Now I changed the 14 ch Rx for a 7 ch R617FS connected to the APM and no more problems of reading.

I wondering if it is possible that APM also can't read 2.7 V input signal and if it is possible to modify the multiplexer firmware to reduce the reading threshold.

Has anyone experienced the same problem with Futaba 14 ch RX?

 

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