In the US, we are not allowed to change transmitter crystals without having the transmitter checked for proper tuning.

I know you are not in the US, so that may not apply.

Tower has the Futaba crystals you need for $12.99 each on quite a few frequencies
http://www3.towerhobbies.com/cgi-bin...P=9&I=LXBFL2**
Air: 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 and 60
and
http://www3.towerhobbies.com/cgi-bin...I=LXBFL1**&P=9
Air: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 and 35


The Great Planes crystal http://www3.towerhobbies.com/cgi-bin...I=LXFAT0**&P=0 is also compatible with your receiver. Tower has the following frequencies in stock for $8.99 each:
Air: 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 41, 43, 46, 49, 51, 53, 54, 55, 56, 57, 59 and 60


According to the GWS web site http://www.gws.com.tw/english/produc...on%20chart.htm their receiver crystals are "Compatible Frequency Error Within ± 300HZ" in a Futaba receiver. I do not know if that is good enough. They claim their transmitter crystal is a direct replacement for Futaba.

You cannot use any 'dual conversion' crystal in the receiver you have. I do not know if a Hitec single conversion crystal will work in your Futaba receiver. I would not risk using the Hitec crystals in the receiver or transmitter.


If a receiver you are looking at is on the 35mhz band, it is not compatible with your 72 mhz equipment. I have no idea how to find info for the R136F. Hitec, GWS, and Castle Creations (Berg) all make 72mhz receivers that work with Futaba transmitters so you do have options.