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Using the built-in OIP3 measurement function via program

 

1. When the OIP3 function is invoked thru the touchscreen, it then asks for the "left-hand" and "right-hand" frequencies.?
However, if the OIP3 function is invoked programmatically via "menu 8 3", ?the centre frequency is strangely changed to 1.5 kHz and the span to 3 kHz. Hence, I will need to send additional commands: "sweep center [Hz]" and "sweep span [Hz]" to positions the markers 1-4 on the correct frequencies. Is there a way to send "left-hand" and "right-hand" frequencies via command??
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2. The measured OIP3 values are displayed on the TinySA's screen - 2nd line from the top (attached image). Is it possible to read these values programmatically? My present solution is to read the markers 1-4 individually via "marker [#]" and then calculate the OIP3, but it takes too many lines of code. ?? Thanks.
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73, Chin-Leong Lim, 9W2LC.?
 

Greetings,
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? ? ? ? ? ? ? ?Nice OIP measurement display example - many thanks for the post! The TinySA Ultra is certainly a wonderfully versatile instrument with many capabilities!
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? ? ? ? ? ? ? ?I noticed a minor technicality in the display text which might be worth refinement consideration within a future firmware release.
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? ? ? ? ? ? ? ?The OIP values are shown in dB units which technically refer to relative power ratios instead of absolute power levels. To be specifically correct the OIP values should, in this case, be shown 42.6dBm and 42.3dBm which reference 1mW.?
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73
Tom
VA7TA
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Hi Tom,
Thanks for the kind comments and also pointing out the error in the OIP3 unit.
The main intention of my post is to ask for help with automating the OIP3 measurement. I am hoping that there are some ways to: 1. input the fundamental frequencies to the OIP3 function and 2. read the on-screen OIP3 values.
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73, Leong, 9W2LC.
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