USER’S MANUAL__________________________________________________________________
118 _________________________________________________________________ M211322EN-D
The RVP900 can inhibit the subset of blankable trigger lines whenever a
noise measurement is taken. This is forced whenever trigger blanking
(based on TAG0) is enabled, but it can also be selected in general via this
question. Since noise triggers must be blanked whenever trigger blanking
is enabled, this question only appears if trigger blanking is disabled.
This question permits the state of the triggers during noise measurements
to be consistent and known, regardless of whether the antenna happens to
be within a blanked sector; and you have the additional flexibility of
choosing blanked noise triggers all the time.
Rx–Fixed Triggers: #1:N #2:N #3:N #4:N #5:N #6:N P0:N P1:N
Z:N
You have explicit control over which RVP900 trigger outputs are timed
relative to the transmitter pre–fire sequence, versus those which are
relative to the actual received target ranges. Triggers in the first category
will be moved left/right by the "L/R" keys in the Pb plot, and will also be
slewed in response to Burst Pulse Tracking. Triggers in the second
category remain fixed relative to "receiver range zero", and are not affected
by the "L/R" keys or by tracking.
This question specifies which triggers are Tx–relative and which are Rx–
relative. Answer with a sequence of "Y" or "N" responses for each of the
six trigger lines, for the two polarization control lines, and for the timing
of the phase control lines. You should answer No for any trigger that is
involved with the pre–fire timing of the transmitter. If you enable the Burst
Pulse Tracker (see Section 6.1.4 Burst Pulse Tracking on page 188), you
probably want to assign a Yes to some of your triggers so that they remain
fixed relative to the burst itself.
It is very helpful to have these two categories of trigger start times.
Triggers that fire the transmitter, either directly or indirectly, should all be
moved as a group when hunting for the burst pulse and moving it to the
center of the FIR window. However, triggers that function as range strobes
should be fixed relative to range zero, that is, the center of that window,
and the center of the burst. This distinction becomes important when the
transmitter's pre–fire delay drifts with time and temperature.
2–way (Tx+Rx) total waveguide length: 0 meters
Use this question to compensate for the offset in range that is due to the
length of waveguide connecting the transmitter, antenna, and receiver. You
should specify the total 2–way length of waveguide, that is, the span from
transmitter to antenna, plus the span from antenna to receiver. The
RVP900 range selection will compensate for the additional waveguide
length to within plus–or–minus half a bin, and works properly at all range
resolutions.
To Next Page
Loading...