Hi Erik and gang,
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I owe Erik an apology as not to long ago I said the interval triggering feature that Erik implemented for me a few years ago on the TinySA was not working properly on my TinySA Ultra.? In a recent post that Erik responded to someone on a different topic he mentioned setting the RBW to 850 KHz when using Zero Span mode and that made me revisit the interval triggering feature as I had ignored the RBW setting when using interval triggering.
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Today I tested the interval triggering feature with the display sweep time set to 20 msec, trigger interval set at 32.6msec which is a multiple of 1/60 (60 being the power line frequency in the US), set the RBW to 850 KHz, and the Zero Span frequency set to 146 MHz which is a frequency I know I can hear RFI that's generated by an LED light dimmer in my family room that I use for testing the interval trigger feature.? I then turned on the LED lights and I can easily see the light dimmer going into conduction at a frequency of 120 Hz which would be each half cycle of the 60 hertz sinewave and it's a very stable display (apparently in sync with the 60 Hertz line frequency which is what I was hoping for).? I've attached a screen shot showing the display generated by my LED light dimmer driving LED can lights (antenna used was a homebrew Moxon beam designed for 146 MHz).
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I originally wanted this interval trigger feature to help track down RFI like power line noise that's in sync with the electrical grid frequency, and will now continue my work on this subject now that I better appreciate the setting of RBW when in zero span mode.? Having the ability to trigger in sync with the electrical grid is beneficial when there are other signals present which are not necessarily in sync while you are attempting to see signals in sync with the grid.
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Bottom line is that the interval trigger feature appears to working great and having the RBW set to 850 KHz really helps.
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Big Thanks to Erik,
Don (wd8dsb)
