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[cheapsub]

All dual conversion conversion RX crystal are the same, futaba, hitec and airtronics.
multiplex long story.....

Have some stashes of...

[cheapsub]

Just a note, (+) and (-) shift is change at the software setting not the at the RF module. Same goes for PCM stuff. So all RF module are the same! but...

[cheapsub]

GOOD STUFF.
for the big sub that need a lot of channel, I finded a 12 channel rx that works.
I don't remember that opentx can change (+)...

[cheapsub]

Even the fly boys can't do much about it, on 72Mhz side. When it come to power lines.
you could try others receivers, like JR or hitec has some...

[cheapsub]

what make and model of the transmitter and receiver?

AM vs FM

want to try 27MHz, 433MHz
2.4GHz?