waterfallis not moving. Click the button displayed towards the top left. It is marked ❷is not being displayed then look at the control labelled ❶ and select Java instead of HTML5. - or - Note that the interface presented to phone users is much simpler than that presented to users on tablets and computers but the basic controls and method of tuning is exactly the same. WebSDR viewed on an iPhone The colourful area labelled ❷is known as the waterfall and this is a graphical representation of the radio signals being received across the spectrum. We can use this to spot where radio signals are to help tune in on them. This section should constantly be scrolling upward and, in that way, we see not only a real time visual picture of signals on the radio spectrum but also the last 5 – 10 seconds of history. We can scroll up and down the spectrum by hovering the mouse over the waterfall and left clicking and then moving sideways (either left or right) while holding down the left mouse button. The frequency that you can actually hear is indicated by the little yellow marker at the bottom edge of the waterfall . Similarly, to tune in a signal this can be
grabbedusing the mouse and moved left and right. Fine tuning by using the mouse to move the yellow tuning marker can be tricky so control ❸allows us to type a frequency directly into the control box and provides buttons to tune up (+, ++ & +++) or down (-, --, &---) in small medium or large steps. The buttons below this that say
Set mode to | Description | When to use |
---|---|---|
CW | Continuous Wave | Morse Code |
LSB | Lower Side Band | Listening to Amateur Radio voice transmissions below 10 MHZ |
USB | Upper Side Band | Listening to Amateur Radio voice transmissions above 10 MHZ |
AM | Amplitude Modulation | Listening to Broadcast Radio |
FM | Frequency Modulation |