Vaisala RVP900 - General Conventions Within the Plot Commands

Frequency span of the plot is 36.0 MHz to 72.0 MHz.
Available Subcommands within 'Ps':
I/i Impulse response length Up/Dn
N/n & W/w Filter bandwidth Narrower/Wider
U/u & D/d MFC Up/Down (On/Off '= ', Test '|')
A/a & S/s Aperture & Start of AFC window
#/*/& Print filter coefficients/FreqResp/Dump everything to temp file
V/v Number of spectra averaged
Z/z Amplitude zoom
<space> Alternate Plots
% Toggle between IF input channels
- Single Step
Table 37 Ps Subcommands
Command Description
I/i
Increments or decrements the length of the matched filter's impulse response. Each
keystroke raises or lowers the FIR length by one tap.
Often the matched filter's characteristics can be much improved by changing the FIR
length by one or two taps. Experiment with this as you design your filter.
N/n & W/w
Changes the passband width of the matched filter to make it narrower or wider.
The lower case commands make changes in 1 KHz steps
The upper case commands use 100 KHz steps.
The value is reported on the TTY as BW.
Often a small change in passband width shifts the exact locations of the filter's zeros, and
may improve the DC rejection.
U/u & D/d
Implement the Manual Frequency Control (MFC) override, and allow the RVP900/IFDs
AFC output voltage to be manually set to any fixed level.
The lower case commands make changes in 0.05 D-Unit steps, and the upper case
commands use 1.0 D-Unit steps.
The value is reported on the TTY as AFC.
=
The = key toggles MFC mode or and o.
A warning is printed if you exit the Ps command while MFC is enabled, and you are given
a chance to re-enable AFC.
|
To enter the AFC test submode, press the | key.
See 6.6.6 Using AFC Test Mode (page 151).
#
Prints the coecients the current FIR filter.
The values are scaled by the coecient with the largest absolute value, so that they all
fall in the 1 ... +1 range.
You can use this information to model the filter behavior for point targets that fall
between discrete range bins, for example, when performing a radar sphere calibration.
See 7.2.1 FIR (Matched) Filter (page 172).
*
Sends content to a .tmp file.
Chapter 6 – Plot-assisted Setups
141