Chapter 4 _____________________________________________________ TTY Nonvolatile Setups
VAISALA______________________________________________________________________ 135
as soon as any activity is detected from the host computer. Only use this
feature on radars with a serious drift problem in their burst pulse timing.
Enable burst power based correction of Z0: NO
With this feature enabled, the processor will adjust the value of the
calibration reflectivity (Z0) to compensate for long term changes in the
transmit power. We do this by assuming that the burst pulse power is
proportional to the transmit power. At calibration time, we record the burst
pulse power. If this number is available and provided to the RVP900 at
processing time, then the processor can notice the difference and adjust the
calibration. The burst pulse power must be above the "Minimum power for
valid burst pulse" value specified above. The calibration changes are done
only at the beginning of a processing mode change, which means once per
task in IRIS.
The corrected calibration reflectivity numbers to do this are stored with the
time series. To get the correction applied, you need to turn on the
OPTS_ZCAL flag in the SOPRM command (see XARG 6 in Section 7.3
Setup Operating Parameters (SOPRM) on page 259).
Simulate burst pulse samples: NO
The RVP900 can simulate a one microsecond envelope of burst samples.
This is useful only as a testing and teaching aid, and should never be used
in an operational system.
A two–tone simulation will be produced when the RVP900 is setup in
dual–receiver mode. The pulse will be the sum of two transmit pulses at the
primary and secondary intermediate frequencies. To make the simulation
more realistic, the two signal strengths are unequal; the primary pulse is
3 dB stronger than the secondary pulse.
Frequency span of simulated burst: 27.00 MHz to 32.00 MHz
The simulated burst responds to AFC just as a real radar would. The
frequency span from minimum AFC to maximum AFC is given here.
4.2.6.1 AFC Motor/Integrator Option
The question "AFC Servo– 0:DC Coupled, 1:Motor/Integrator" selects
whether the AFC loop runs in the normal manner (direct control over
frequency), or with an external Motor/Integrator type of actuator. The
question "AFC minimum slew request:..." provides additional control
when interfacing to mechanical actuators whose starting and sustaining
friction needs to be overcome.
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