6. Plot-assisted Setups
6.1 Plot-assisted Setup Overview
The IFDR receiver module replaces most IF components in a traditional analog receiver. The
alignment procedures for those analog components are usually very tedious, and require
continued maintenance.
RVP900 improves the alignment procedure by providing an interactive graphical alignment
procedure for burst pulse detection, Tx/Rx phase locking, and calibration of the AFC
feedback loop with tools for:
• Viewing samples of the burst pulse and receiver waveform to examine their frequency
content, design an appropriate matched
filter, and observe live operation of the AFC.
• Checking the spectral purity of the transmitter on a regular basis to check for unwanted
noise or harmonics.
RVP900 can track and modify the initial settings so that proper operation is maintained
even with changes in temperature and aging of the microwave components.
To access the Plot-Assisted Setups, type the P commands in the TTY setup interface.
You can use the dspx utility to display the plots on the workstation screen, and you can
perform graphical checkup and alignment procedures remotely through a network.
RVP900 supports opcodes that allow the host computer to monitor the data being plotted.
6.2
Plot Command Conventions
The Pb, Ps, and Pr commands have a similar structure to their TTY user interface.
Each command begins by printing a list of subcommands that are valid in that context. The
subcommands are single keystrokes that RVP900 executes immediately when they are
typed, you do not need to press ENTER. The available subcommands are
dierent for each
plot command. As much as possible, each key has a similar meaning across all commands.
The working and measured parameters for each plot command are printed on the TTY as
two lines of information following the subcommand list:
• The first line contains settings that change when a subcommand is issued.
The
first line is printed once.
• The second line is live and reflects the current status of the burst input, the IF input, or
the AFC output.
The second line is continually overprinted. This makes it appear as a live status line with
up-to-date values.
The Pb, Ps, and Prcommands report No Trigger on the TTY status line when the external
trigger is expected, but missing.
Chapter 6 – Plot-assisted Setups
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