USER’S MANUAL__________________________________________________________________
312 _________________________________________________________________ M211322EN-D
For each pulse width there is a corresponding minimum trigger PRT
permitted. This bound is intended to limit the transmitter duty cycle to a
safe value under all conditions. PWINFO sets up these minimum PRTs
using words 2 through 5 following the command. The maximum frequency
of the internal trigger generator is then constrained at each pulse width to
the indicated rate. This protection applies at all times, that is, during noise
sampling, during ray processing, and during the standby time between
rays. The default PRT bounds are 2000, 1000, 750, and 500 Hertz (Inputs
of 3000, 6000, 8000, and 12000). If your radar does not use all of the pulse
width codes, it is still a good idea to set the unused PRT limits to
reasonable values. This way protection is still provided in the event that
SETPWF accidently selects one of the unused states. If the internal trigger
generator is not being used, then the PRT limits no longer affect the actual
trigger rate and transmitter protection becomes the responsibility of the the
user hardware. Finally, note that the entire pulse/bandwidth mechanism
can be effectively turned off by setting the bit patterns and PRT limits all
to the same value.
The PWINFO command can be disabled (for transmitter safety), so that
PRT limits cannot accidently be changed by the host computer. When this
is done the RVP900 still reads the five input words, but no changes are
made to the pulse width and PRT information. Thus, the command I/O
behaves the same way, whether enabled or disabled.
0916-151
UpperPW Upper two bits of the four 4-bit pulse widths being defined.
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