Pb subcommands

When using the passband filter, the available subcommands are:

Available Subcommands within 'Pb':
I/i               Impulse response length up/down
A/a & S/s         Aperture & Start of AFC window 
L/l & R/r         Shift triggers Left/Right
T/t               Plot Time span up/down
Z/z               Amplitude Zoom
> and <   Start/Stop logging to rvp10-pb.log
%                 Toggle between IF input channels 
.                 Single step

These subcommands change depending on whether the passband filter or the matched filter is configured. If the matched filter is selected the filter impulse response becomes the burst pulse length and the value may be lengthened or shortened using P/p keys.

Pb subcommands
Command	Description
I/i or P/p	Increments or decrements the length of the passband filter's impulse response. Each keystroke raises or lowers the FIR length by one tap. OR Increments or decrements the pulse width definition. Each keystroke raises or lowers the pulse width by 0.1 microseconds for use in the idealized matched filter.
A/a & S/s	Raise/lower the aperture/start of the subwindow of burst pulse samples for AFC. If you do not use these commands, the full FIR window is used. Shortening the AFC interval results in two sample windows being drawn on the plot. Position the smaller AFC window positioned in the center portion of the transmitted pulse, where the burst amplitude and frequency are fairly stable.
L/l & R/r	Shift the group of RVP10 triggers left or right (earlier or later in time). The lowercase commands shift in 0.025 μsec steps, and the uppercase commands shift in 1.000 μsec steps (approximately). The reason for shifting all 6 triggers at once is that the relative timing among the triggers remains unchanged. However, the absolute timing (relative to range zero) varies, and this causes the burst pulse A/D samples to move within the sample window.
T/t	Increments or decrements the overall time span of the plot. The available spans are 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, and 5000 microseconds. The value is reported on the TTY as `PlotSpan`.
Z/z	Zooms the amplitude of the burst pulse samples so that they can be seen more easily. The value is reported on the TTY as `Zoom`.
> and <	The live plotted data can be logged to the `$(IRIS_LOG)/rvp10–pb.log` text file; one line per plot.
%	Toggle between the IFDR IF-Input sources.