Mt — Triggers and timing

To configure the general properties of the RVP10 trigger generator, type Mt with no additional arguments.

Transmit pulse width index: 0

Here you can check the Transmit pulse width index (Limits: 0 ... 3).

External pretrigger

Use external pretrigger : YES
  PreTrigger active on rising edge: YES

When an external pretrigger is applied to the RVP10 TRIGIN input, either the rising or falling edge of that signal initiates operation.

This decision also affects which signal edge becomes the reference point for the pretrigger delay times given in the Mt<n> section.

Output triggers

Number of user–defined output triggers: 6

This question defines the number of user-defined output triggers. The number is limited to 12 (including polarization output controls).

Polarization output controls

Number of polarization output controls: 2

This question defines the number of polarization output controls.

Blankable triggers

Blank output triggers within AZ and EL sectors: YES 
Sector#1  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#2  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#3  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#4  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#5  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#6  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#7  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO
Sector#8  InUse:NO AZ:  0.0,0.0  EL:0.0,0.0 Ped:NO

This settings reduces erroneous transmissions into physical obstructions.

RVP10 can inhibit the subset of blankable trigger lines when a noise measurement is taken. This is forced when trigger blanking (based on TAG0) is enabled, but it can also be selected in general through this question. Since noise triggers must be blanked when trigger blanking is enabled, this question only appears if trigger blanking is disabled.

These settings permit the state of the triggers during noise measurements to be consistent and known, regardless of whether the antenna is in a blanked sector. 

Blank output triggers when changing pulsewidth : YES  
    Times to wait (milliseconds) before/after PW change: 0 0

This question defines whether blanked noise triggers are used when changing pulsewidth.

Blank output triggers during noise measurement : YES
 Blank triggers : #1:Y #2:Y

This question defines whether blanked noise triggers are used all the time.

Transmitter-related and receiver-related triggers

You can specify which triggers are transmitter-related and which are receiver-related.

Answer YES or NO for each trigger line, for the two polarization control lines, and for the timing of the phase control lines.

Answer NO for any trigger that is involved with the pre–fire timing of the transmitter.

If you enable the burst pulse tracker, you probably want to assign a YES to some of your triggers so that they remain fixed relative to the burst itself. See Burst pulse tracking.

The trigger outputs are defined by:

  • Which RVP10 trigger outputs are timed relative to the transmitter pre–fire sequence.

    You can move these triggers left/right using the L/R keys in the Pb plot.

    These triggers are also skewed in response to Burst pulse tracking. See Burst pulse tracking.

  • Which RVP10 trigger outputs are relative to the received target ranges.

    These triggers remain fixed relative to "receiver range zero", and are not affected by the L/R keys or by tracking.

For the trigger start times, move triggers that fire the transmitter, either directly or indirectly as a group when hunting for the burst pulse and moving it to the center of the FIR window. Fix triggers that function as range strobes relative to range zero, that is, the center of that window, and the center of the burst. This distinction is important when the transmitter's pre–fire delay drifts with time and temperature.

Rx–Fixed Triggers: #1 :N #2:N #3:N #4:N #5:N #6:N P0:N P1:N Z:N

Use the parameter 2–way (Tx+ Rx ) total waveguide length to compensate for the offset in range that is due to the length of waveguide connecting the transmitter, antenna, and receiver. Specify the total 2–way length of the waveguides. The RVP10 range selection compensates for the additional waveguide length to within plus–or–minus half a bin, and works properly at all range resolutions.

2–way (Tx+ Rx ) total waveguide length: 0 meters