Do a Real Magic Spell: "Essdeeaar!"

Interactive IQ modulation and demodulation webpage, with adjustable constant values for I and Q:

https://www.geogebra.org/classic/nymqtwnc

- drag the sliders and observe the changes live
- sliders can be animated
- zoom and pan
- turn functions on/off by clicking the left circles
- edit the functions and play around with ideas and visualization
- can be saved, shared or exported as a picture

The model can be accessed online, as a webpage, no installation required.
(The same model can work offline, too, but only after installing GeoGebra.)

Get an SDR

A good example for a cheap SDR receiver is an RTL-SDR TV USB dongle. RTL-SDR was designed as a TV tuner for PCs. It can be plugged into a USB port, and with it's software installed it can receive FM radio stations or TV programs.

But with a hacked driver, the same USB dongle can be used as an SDR. And it's cheap, about $10. This is the little beast:

and this is the tuner chip used by this USB SDR:

Get one, but don't waste your life watching stupid TV broadcasts with it!

Install HDSDR

HDSDR stands for High Definition Software Defined Radio, and it's a free software that can be used with many SDR tuners.

• download HDSDR and install it
• download and install Zadig drivers for RTL-SDR
• download ExtIO_RTL.dll and copy the ExtIO_RTL.dll file into the HDSDR folder (usually "C:\Program Files (x86)\HDSDR")
• start HDSDR and press F2 (Start)

Play with it, get used with an SDR

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