Initial Setup of Information for Each Pulse Width

Test Goal

Enter the initial values for the TTY Setups for each of the pulse widths.

The final values of trigger timing, FIR filter impulse response length, and bandwidth are adjusted later.

Background

The duty cycle of the transmitter is the product of the PRF and the pulse width in seconds. For example, a PRF of 1000 Hz and 1 microsecond pulse width is a duty cycle of 0.001. Thus a transmitter with a 0.001 duty cycle limit could function at 1000 Hz and 1 microsecond pulse width, or 500 Hz and 2 microsecond pulse widths.

The duty cycle limits of your radar should be obtained from your system documentation or radar manufacturer. RVP10 supports up to four pulse widths (coded 0 to 3), although most transmitters typically support only 2 pulse widths. Record, in the chart below, the pulse width in microseconds and the maximum PRF that is allowed for each pulse width.

Test Procedure

1. Enter the TTY setups through dspx.
2. Issue the Mt # command, once for each pulse width.
3. Enter the start time and widths for each trigger as shown in Mt<n> — Transmit sequence #n.
4. For all unused triggers, set the width to 0.
5. Enter the Maximum PRF from the chart above.
6. Set the initial impulse response length to 1.5 times the pulse width, and the initial pass bandwidth to the inverse of the pulse width.

Checklist