This is neither an IR nor an RF signal. I put the scope directly to the uC pin outputting this signal. This is the waveform which creates an alarm like noise when fed to the base of the npn transistor on which a coil and a piezo buzzer are connected on the collector side in parallel to each other. But since the pulses are changing so quick, visually I can only make out that the minimum pulse is 150uS and MAX is 250uS. These pulses are increasing from 150 to 250 in some number of steps. I tried replicating this in equal 10 increments of 10uS but it does not match as it does not produce the same sound effect. So I logged the data, but need someone to explain me what the two long rows mean. To me it seems some values (between 150uS - 250uS) are repeated more than once, I am hoping the correct interpretation of the logged data will make it more clear.