Hi..I'm Mat Atoi from Malaysia...need a circuits for my 49MHz heli transmitter..I think it is a 4 channel remote control radio. Thank you for the reply....(sorry if my English is not that good)..

 

My new RC Heli (and airplanes) operate at 2.4GHz. The transmitter scans all channels then automatically selects a channel that is not in use so many RC things can operate at the same time.
I think I saw 49MHz RC toy cars about 25 years ago. But that was before the internet so it would be difficult to find their schematics today.

 

http://talkingelectronics.com/projects/27MHz Transmitters/27MHzLinks-1.html

Sorry, it seems to be the 'other' frequency, but everything shown would be almost the same except for crystal and antenna end

 

You can live in the past if you want. I remember long ago when modellers carried a flag showing "their" frequency.
But RC radios today automatically select a microwave channel without interference.

 

 

You can live in the past if you want. I remember long ago when modellers carried a flag showing "their" frequency.
But RC radios today automatically select a microwave channel without interference.

The bright side to this is we can use our "ancient radios" now with zero interference, and a lot better range!

 

Who needs range? Read up on the FAA's effort to include model aircraft under its Unmanned Aircraft Program Office (UAPO) (see: page 5, Model Aviation, December, 2010). I am worried whether we will still be able to fly at all.

One of the biggest changes 2.4 GHz has brought about is that a short antenna no longer gets anyone excited. It used to be when someone started to fly without extending their antenna, everyone around would give a warning. Now that doesn't happen.

My advice to the OP is to tell us what Tx he is using. Maybe someone knows of a module around. I would also suggest posting on RC Universe or similar sites. Building a module from scratch is just not practical, unless he has much more experience and equipment than he indicates.

John