Originally Posted by rcflyer_09
Heres the crystal that was in the rx.
That receiver will not work correctly with that crystal.
Make sure to use a Dual conversion (blue tipped) Hitec crystal in that receiver and the equivalent Futaba transmitter crystal in the Futaba module:
Crystals are no longer interchangeable between brands, contrary to popular belief they are totally different in cut, overtone value and a few other specs. e.g. Hitec DC RX crystals on 35.36 & 40MHz have a frequency 10.7MHz ABOVE the nominal frequency whereas Futaba DC RX crystals are 10.7MHz BELOW nominal frequency. Hitec FM TX xtals are cut at half nominal frequency whereas the Futaba FM TX xtals are cut at 1/3 nominal frequency.
With single conversion RX, whilst you may get reasonable results in good conditions with Hitec xtals in Futaba RX, Hitec crystals must be used in Hitec RX for optimum results. Futaba single conversion RX crystals may appear to work but with proven less range and glitching, especially noticeable in damp weather or wet ground. Local radio technician was surprised but ran a number of tests with result he is also now convinced that there is a significant difference in the crystals as has also been confirmed by the local crystal manufacturer who supplies USA military and others requirements.
For further information, refer to
Crystal Compatability Chart for RC units
Crystal compatibility between brands
Alan's Hobby, Model & RC FAQ Web Links