Using a Siglent 1204X-e and a Pi running SOX to IMD Test an IC-7300

In an earlier video, I showed you how I use the FFT functions of a Siglent oscilloscope to measure the Intermodulation Distortion produced by HF SSB transmitters. In another, I showed a way to generate tones for such testing using a Raspberry Pi.
This video uses these two techniques together to test an ICOM 7300 on 20 meters. There are several lab reports out there for this radio so we can compare our results to theirs! Here's a link to one of them:
www.ab4oj.com/icom/ic7300/ic7...
You can watch my original videos showing how to set up the scope and SOX on the PI at:
• Measuring SSB Two Tone...
and
• Using SOX on a Raspber...
PS:
---------------------------------
I mentioned in the video that that there is some residual noise in the USB card audio output that shows up as noise and artifacts below -60dbc. I did this to simplify the hardware needed for the demonstration. It works adequately for most purposes.
As shown, the USB audio output is used at its full level and reduced for the transmitter by means of sox "gain" commands to attenuate the signal going IN to the USB card.
If you would like to measure IMD components below -60DBc, you can get a cleaner signal to use for that purpose by inserting an inline attenuator of at least 12db between the USB card and the transmitter and readjusting the SOX and mic levels appropriately!
---------------------------------
mv

[@aviationodyssey1892]

Great informations, thank you!

[@VE9QRP]

Thanks. This is an excellent video.

[@mariovano]

You're very welcome!

[@todaysfigures598]

very useful, thank you

[@mariovano]

You are welcome!