thanks Ioannis

I see that its at 455khz and would be a good test what i am trying to do

you show some code on how generate frequency cycle

i see the reciever requires

The data signal should fullfill the following conditions:
 The carrier frequency should be close to 455kHz.
 The burstlength should be at least 22s (10 cycles of the carrier signal) and shorter than 500s.
 The separation time between two consecutive bursts should be at least 26s.
 If the data bursts are longer than 500s then the envelope duty cycle is limited to 25%.
 The duty cycle of the carrier signal (455kHz) may be between 50% (1.1s pulses) and 10% (0.2.ms pulses).
The longer duty cycle may help to save battery power.