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4.4 - Tuning -- the details
Depending on what you want to receive, one way to tune is to adjust the receive frequency by →Left-click or →Right-click on the digits of the frequency displays. There are two of them; the lower one defines the center of the displayed bandwidth; the upper one allows you to select any frequency that is currently in the displayed bandwidth.
(Zero-on-Click) affects how this works; if is on, then all digits to the right of the one you are clicking on change to zero as soon as you make a change to any digit. If is off, only the digit you are clicking on changes.
Another way to tune is to click along the top row of tuning buttons. Also, →Left-click will lock the tuning position and scroll the signal display and waterfall instead of moving the demodulator along the signal display. If you're stepping through a broadcast band with , , , , or , , →Right-click on any of those buttons will re-center the tuned point. This will work best with . →Left-click and holding will result in the tuning operation repeating automatically.
Likewise, changes how the and buttons adjust the center and demodulator tuning. You'll find on is a good way to work through a broadcast band, especially when generally tuning in 5, 9 or 10 KHz steps.
Another way to tune is by simply pointing and clicking on the waterfall or the RF signal spectrum display. Note that the Mouse Click Resolution settings in the dialog affect how tuning operates when you're clicking on the spectrum or the waterfall.
Another is using keystrokes: See the tuning keystroke reference, below, or press on the control panel.
The displayed bandwidth for the signal display itself depends upon two things: First, the bandwidth set with (50, 100, 150 or 190 KHz for the SDR-IQ) if you are receiving, or the bandwidth of the recording you are loading (for instance, you can handle a much wider NETSDR recording even if you only have an SDR-IQ), or the bandwidth set in the FUNcube configuration dialog ( →Right-click ); and second, the Span, set with the and controls at the left side of the SdrDx control panel, or with the ⇑ O and ⇑ P keystrokes.
Note that as you adjust the frequency, the information box above the memory selection buttons tells you what portion of the spectrum you are in, as in what ham band, what broadcast band, what CB channel and so on.
You can press , , to move to the next or previous broadcast band, or press the , buttons to move to the next or previous amateur band. When using these, the band edge will be located 10 KHz from the left edge of the display as long as there is room to do so. sets the left edge to the amateur phone (voice) regions for these operations, if you're not interested in CW or data transmissions. Holding the tuning buttons down will cause them to repeat.
As mentioned above, there are quite a few keyboard commands that allow you to conveniently adjust frequency without reaching for the mouse. Before using them, however, you should →Left-click once if it is illuminated, and twice if not; otherwise, sometimes OS X will "eat" your keystrokes and the program will not recognize that you have pressed a key. See the reference section for a complete list of keystroke commands. You can also press ⇑ K to view a dialog containing all of the keystroke commands. You can also →Left-click to examine or alter the assignment of any key to any command.
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