Transmit tone at 315Mhz

@KenF - working on the oscillator circuit now.

@jremington - so something like this?

#include <VirtualWire.h>

void setup()
{
    Serial.begin(9600);	  // Debugging only
    Serial.println("setup");

    // Initialise the IO and ISR
    vw_set_ptt_inverted(true); // Required for DR3100
    vw_setup(2000);	 // Bits per sec
}

void loop()
{
	const char *msg = "hello";

	for (int i=0; i <= 500; i++){
		vw_send((uint8_t *)msg, strlen(msg));
		vw_wait_tx(); // Wait until the whole message is gone
	} 
	
}