Vaisala RVP900

Chapter 7 __________________________________________________ Host Computer Commands
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7.14 Set Pulse Width and PRF (SETPWF)
This command selects the pulse width and trigger rate. A 4-bit pulse width
code is passed in bits (13,12,9,8) of the command word, and selects one of
sixteen pulse widths as described under PWINFO. The new radar PRT is
passed in word #1. For all processing modes that use a fixed trigger rate,
this value defines the trigger period that is output at all times except during
noise measurements. For Dual-PRF applications, this word defines the
short period (high PRF) rate. The long period is internally computed as
either 3/2, 4/3, or 5/4 the short period, and the trigger generator alternates
between the short and long rates on each successive ray.
0916-153
UpperPW Upper two bits of overall 4-bit pulse width selection
LowerPW Lower two bits of overall 4-bit pulse width selection
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Bits for PW 3 | Bits for PW 2 | Bits for PW 1 | Bits for PW 0 | Input 1
|_______________|_______________|_______________|_______________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Min Trig Period (0.16667usec Increments) for Pulse Width 0 | Input 2
|_______________________________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Min Trig Period (0.16667usec Increments) for Pulse Width 1 | Input 3
|_______________________________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Min Trig Period (0.16667usec Increments) for Pulse Width 2 | Input 4
|_______________________________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| Min Trig Period (0.16667usec Increments) for Pulse Width 3 | Input 5
|_______________________________________________________________|
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| |UpperPW| (Rsv) |LowerPW| | 1 0 0 0 0 | Command
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