Yes, a radio tuning is required. I know that R/C car drivers do it
regularly but they don't require much range and there are no risk to take
with an airplane. Tuning involve adjusting some of the transmitter's
electronic components to match the crystal's own frequency. The goal is to
get maximal power output 'on the air' (through the antenna). An untuned
transmitter will have a poor range and some of its power will dissipate
inside the transmitter box as heat with the possibility of degrading some of
its active components (transistors).
I have this radio set too. I like especially the receiver with its speed
controller and BEC circuits. It works well with my electric trainer. I
whish Futaba would make a new set like this one but in a smaller rec.
package and with a more efficient high-rate speed controller.
I hope my techno-blahblah helps you.
> I have a Futaba 4NBL Attack Transmitter that doesn't have a crystal, and
> a receiver with a 54 crystal. The transmitter apparently had a 54
> crystal that has been taken out for some reason. I have a pair of new
> AM Futaba crystals on 40. Can anyone tell me if I can just stick them
> in and they'll work well, or does that unit need some kind of tuning to
> change crystals that far away from the original frequency. Thanks,
> Sent via Deja.com http://www.deja.com/
> Before you buy.