USER’S MANUAL__________________________________________________________________
156 _________________________________________________________________ M211322EN-D
5.4.3 TTY Information Lines Within Ps
The TTY information lines will resemble:
Navg:3, FIR:1.33usec (48 Taps), BW:1.000, MHz, DCGain:ZERO
Freq:30.027 MHz, Pwr:64.2 dBm, Loss:1.2dB, AFC:23.05%
(Manual)
In dual-receiver mode, the $ command will search for a
filter that minimizes the maximum width and DC offset
at both receivers intermediate frequencies. The final
filter will be the one that has the best simultaneous
performance at both IFs.
V/v The V command increments or decrements the number
of burst pulse spectra that are averaged together to
create the plot. The count ranges from one (no
averaging) to 25, and is reported on the TTY as "Navg".
Z/z The Z command zooms (that is, shifts on a logarithmic
scale) in 1.0-dB steps the amplitude of the burst pulse
spectra. This is useful when the overall 70 dB plot span
is not sufficient to hold the full range. Zoom can also be
used to line up the burst spectrum with the filter
response so that the two can be compared. The zoom
level is not printed on the TTY because there is nothing
useful that could be done with it.
<space> The space bar alternates among three choices for the
type of spectra that are plotted: 1) FIR frequency
response, 2) Burst pulse spectrum, and 3) Both.
% In dual-receiver mode, the % command toggles
between each receiver. The printed status line is
prefixed with "Rx:Pri" or "Rx:Sec" according to which
receiver is selected. Specifically, typing "%" will toggle
the plot of the FIR filters frequency response, and the
printout of its DCGain. However, the plotted spectrum
and printed power levels are always based on the sum of
all input signals, and thus do not change with "%".
Navg Indicates the number of burst spectra that are averaged
together prior to plotting. Larger amounts of averaging
increase the ability to see subtle spectral components, but
the display will update more slowly.
FIR Indicates the length of the impulse response of the matched
FIR filter. See Section 5.3.3 TTY Information Lines Within
Pb on page 146
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