Greetings Erik,
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? ? ? ?Here are some additional comments which I hope are helpful:
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? ? ? ?Although the screen view at "
/g/tinysa/message/37 " shows a time domain capture of a signal the trace shown would need to be expanded to be useful for RFI signal signature identification. It is apparent the signal amplitude shown in this trace was compressed due to the 10dB/div Y axis scale and that the sweep duration captured too many cycles.? IMHO a linear voltage Y axis scale is necessary for this application to produce a trace similar to what would be obtained by an oscillosope connected to an AM detector output with scope settings as follows:
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? ? ? ? ? ? ? ?- Sweep duration set to capture one or two cycles.
? ? ? ? ? ? ? ?- Vertical sensitivity set so the signal is near full amplitude of the screen.?
? ? ? ? ? ? ? ?- Single sweep triggering with storage to capture the waveform.
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? ? ? With a linear scale mode and appropriate vertical gain the signal would be expanded to cover a much wider range of the Y axis. To expand the X axis signal view the availability of a sweep duration of 20 mS would be desirable for utility power related RFI. A 20mS sweep would provide a view of just a couple of cycles of 100/120 Hz related noise. Should a noise with a fundamental of 50/60 Hz be encountered the 20mS sweep duration would result in a single cycle capture which would still be useful.
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? ? ? ?In addition to a normal sweep trigger mode the availability of a single sweep trigger option would be a significant enhancement. Because of the random inconsistencies of typical RFI noise signals a steady trigger point for repetitive sweep cycles might not be available. A single sweep mode with trace storage would be very useful for capturing a noise signature that could otherwise be blurred by the varying trigger points that very possibly would be encountered using repetitive sweep modes.??
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Best Regards,
Tom, VA7TA
