File:GQRX legend one.png

While GQRX is being used as an example, most waterfall tuners have the following elements: 1 The waterfall shows your slice of spectrum in time, the top of the waterfall represents the most recent. The waterfalls usually show the background noise as blue. 2 The signal, colored yellow to red depending on the intensity of the signal. 2a The same signal in a graph representation, the 'peaks' represent signals, the 'valleys' the noise floor. 3 The tuner, here you can input a frequency in MHZ to tune in to. Either by clicking, using the arrow keys or inputting a number. 4 This bar show which slice of the spectrum you are currently viewing. Scroll on it to 'zoom'. 5 This shows the strength of the signal (the closer to 0 the stronger). 6 The demodulated audio signal, use the slider increase the 'gain' (or volume) of the received audio. 7b Arguably the most important part: the tuner. If you click anywhere on the graph or waterfall, you will move this around. Try to click on the middle of your signal. 7: This shows the width of the filter, make sure this covers the entire signal, otherwise you are filtering out a part of the signal you want to hear.