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Hello,
I’m trying to compare different antennas on a copter control transmitter, and want to measure output power (with external antenna).
The problem is – the controller transmits frequency hopping short pulses, with complex type of modulation (something like OFDM).
I can easily find frequency hopping pulses in sweep mode with my BB60c, select any frequency bin, go to zero span mode, turn on video trigger to catch the pulses, but amplitude plot of the pulse is not constant, and jumps +-6dB, due to modulation type (it’s not 2FSK, where output power is a stable flat line).
Is there a way to calculate average power within specified time region (between 2 delta marks) in zero span mode? It will be very helpful here.
Hello Ivan,
There is not a direct way to calculate the average power of the on period of a pulse, but using what we do have, if you notice in the AM vs Time plot in zero-span, there is an average power readout(in newer versions) which takes the average power of the entire acquisition. If you set your trigger position to 0-1% and acquisition length to the length of the pulse, this would give you the measurement you are looking for.
I will add this measurement to our request list, and determine if there is a way we can accomplish this more easily.
Let me know if you have questions or comments.
Regards,
Andrew
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