| Author |
Message |
teekay_tk
Joined: 12 May 2007
Posts: 9
Helped: 1
|
 12 May 2008 17:57 looking for circuit diagram for 27mhz, 40mhz, or 49 mhz RC |
|
|
|
Hi
I am trying to make my own transmitter that should work with 40MHZ OOK reciever for RC helicopter. I have found this circuit from net.
http://www.webx.dk/rc/xtwin/convert17012006.gif
but i dont understand this well or how to conver it to 40mhz.
can some one point me to a nice circuit for 40mhz band transmitter.
input to the transmitter is a digital PCM scheme
thanks
|
|
| Back to top |
|
 |
radiohead
Joined: 13 May 2004
Posts: 316
Helped: 20
Location: Heart of Europe
|
| 12 May 2008 22:18 Re: looking for circuit diagram for 27mhz, 40mhz, or 49 mhz |
|
|
|
| This is a VERY basic transmitter for OOK but it will probably work despite it's limited capabilities (output power, frequency agility, modulation). Replace the 27.145 MHz crystal with the wanted 40 MHz frequency (if you can find one), perhaps tweak some values for frequency tweaking and you're off to go.
|
|
| Back to top |
|
|
teekay_tk
Joined: 12 May 2007
Posts: 9
Helped: 1
|
| 13 May 2008 1:40 Re: looking for circuit diagram for 27mhz, 40mhz, or 49 mhz |
|
|
|
thanks radio head. can you explain to me the two inputs B3 and B2 pins on the micro. As far as i can understand, PCM PWM both require only one digital input (i.e the data stream). so what is the other input for?
thanks
|
|
| Back to top |
|
|
teekay_tk
Joined: 12 May 2007
Posts: 9
Helped: 1
|
| 13 May 2008 10:09 Re: looking for circuit diagram for 27mhz, 40mhz, or 49 mhz |
|
|
|
ok thanks
I understand it better now. The other line is just to turn the modulator on / off
|
|
| Back to top |
|
|
