Vaisala RVP900

Chapter 4 _____________________________________________________ TTY Nonvolatile Setups
VAISALA______________________________________________________________________ 123
require (25.3 μsec)(100 MHz) = 2530 taps to compute, which fits within
the 8000-tap limit.
In dual-polarization mode the “190” in the above formula is replaced with
“95”.
Burst Freq Estimator– Length: 1.33 usec, Start: 0.00 usec
This estimator is mostly used with the Pb (plotting commands); see
Section 5.3.2 Available Subcommands Within Pb on page 145.
FIR–Filter prototype passband width: 0.503 MHz
This is the passband width of the ideal lowpass filter that is used to design
the matched FIR band pass filter. The actual bandwidth of the final FIR
filter depends on the filter's impulse response length and the design
window used in the process. The actual 3 dB bandwidth is:
- Larger than the ideal bandwidth if that bandwidth is narrow and the
FIR length is too short to realize that degree of frequency
discrimination. In these cases it may be reasonable to increase the
filter length.
- Smaller than the ideal bandwidth if the FIR length easily resolves the
frequency band. This is because of the interaction within the filter's
transition band of the ideal filter and the particular design window
being used. For example, for a Hamming window and sufficiently
long filter length, the ideal bandwidth is an approximation of the 6 dB
(not 3 dB) attenuation point. Hence, the 3 dB width is narrower than
the ideal prototype width.
This parameter should be tuned using the TTY output and interactive
visual plot from the Ps command. The actual 3 dB bandwidth is shown
there, so that it can be compared with the ideal prototype bandwidth.
Limits: 0.05 MHz to 10.0 MHz
Output control 4–bit pattern: 0001
These are the hardware control bits for this pulse width. The bits are the 4–
bit binary pattern that is output on PWBW0:3.
Bit Limits: 0 to 15 (input must be typed in decimal)
Current noise level: -75.00 dBm
Powerup noise level: -75.00 dBm
-or-
Current noise levels – PriRx: -75.00 dBm, SecRx: -75.00 dBm
Powerup noise levels – PriRx: -75.00 dBm, SecRx: -75.00 dBm