User's Manual Part 2

RVP8 User’s Manual
April 2003
TTY Nonvolatile Setups (draft)
3–19
Answer the second sub-question according to whether the radar transmitter is directly
fired by the the external pretrigger, rather than by one of the RVP8’s trigger outputs.
In other words, answer “YES” if the transmitter would continue running fine even if
the RVP8 TRIGIN signal were removed. This information is used by the ”L” and
”R” subcommands of the ”Pb” plotting command, i.e., when slewing left and right to
find the burst pulse, the pretrigger delay will be affected rather than the start times of
the six output triggers.
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, i.e., the span from transmitter to antenna, plus the
span from antenna to receiver. The RVP8 range selection will compensate for the
additional waveguide length to within plus-or-minus half a bin, and works properly at
all range resolutions.
POLAR0 is high for vertical polarization : NO
POLAR1 is high for vertical polarization : NO
These questions define the logical sense of the two polarization control signals
POLAR0 and POLAR1. In a dual-polarization radar POLAR0 should be used to
select one of two possible states (nominally horizontal and vertical, but any other
polarization pair may also be used). The control signal will either remain at a fixed
level, or will alternate from pulse to pulse with a selectable transition point (See
Section 3.3.5). POLAR1 is identical to POLAR0, but may be configured with a
different polarity and switch point. This second signal could be used if the radar’s
polarization switch required more than one control line transition when changing
states.
Quantize trigger PRT to ((1 x AQ) + 0) clocks
It is possible to control the exact quantization of the PRT of the internal trigger
generator. Normally the trigger PRT is chosen as the closest multiple of AQ (the
acquisition clock period) that approximates the requested period. This question
allows the possible PRT’s to be constrained to ((N x AQ) + M) clock cycles. This
feature can be useful for synchronous receiver systems in which the trigger period
must be some exact multiple of the COHO period.
Blank output triggers according to TAG#0 : NO
Blank when TAG input is high : NO
Blank triggers 1:YES 2:YES 3:YES 4:YES 5:YES 6:YES
These questions control trigger blanking based on the TAG0 input line. You first
select whether the trigger blanking feature is enabled; and then optionally choose the
polarity of TAG0 that will result in blanking, and which subset of the six user
definable triggers are to be blanked.
Blank output triggers during noise measurement : NO
The RVP8 can inhibit the subset of blankable trigger lines whenever a noise
measurement is taken. This will be 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.