It may be that your RX is just too old. I looked up your rx on http://www.futaba-rc.com/radioaccys/old-receivers.html. The R107M is listed near the bottom of the list (5th from the bottom) of "Wide Band" receivers.

It appears that your rx was discontinued in 1985. It won't play very well on today's Narrow Band TX's, and would most likely be susceptable to adjacent-channel interference.

I know that the older tx's could be modified to the narrow-band configuration of the early 90's, but don't know if the rx's could be, or if it would even be worth it. I'm assuming that your TX is one of the newer Narrow Band units.

Just being nosy and putting in my $.02

I hope that this helps in some way.

Bob