Questions tagged [panadapter-and-waterfall]

Questions about panadapters, waterfall displays, band scopes, or any other equipment that displays a plot of RF power vs. frequency. For test equipment, use the specific tag [spectrum-analyzer].

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1answer
53 views

What determines the bandwidth of an FM signal?

With an FM signal, it takes up more room in the radio spectrum presumedly because the carrier frequency is changed. On average what's the width of the FM sidebands? Does the deviation from the center ...
4
votes
2answers
117 views

What causes the light and dark bands (of background noise) in an HF waterfall display?

While monitoring the 40-meter band (among others) throughout a typical day/night as propagation changes I have noticed there are often bands of very low noise (black area) and others with much higher ...
2
votes
2answers
886 views

What is this burst transmission sequence across the entire band?

Fairly regularly on the 40m band I hear a quick blip of a tone, and when I look at the waterfall I see these brief transmissions all across the band that look like little dots. What is causing that?
2
votes
2answers
161 views

Why is the band scope called panadapter?

This feature that some radios have seem to have various names: band scope spectrum scope water fall panadapter I understand the first three names, but not panadapter. Where does it come from?
5
votes
1answer
184 views

FM spectral amplitudes during silence

General setting I'm playing around with an RTL-SDR and recently captured some FM spectrum in Hannover, Germany. I want to undersand what's going on, so I've read a lot about FM and its spectra, but I ...
5
votes
2answers
2k views

What is a panadapter?

To what does the term "panadapter" refer? (Physical hardware or software?) How did the term "panadapter" originate as related to radios or electronics? How is the term "panadapter" different from ...