The V127Z050 is a 50 Ohms switch variable delay line with 127ns time delay. As a result of, Allen Avionics has designed these delay lines. These units consist of individual delay lines each having its own switch. The time delay is changed by switching one or more individual delay lines in series with the input and output connections.

The delayed output is always the summation of individual delay lines and not the result of a tapped line. This feature is an important factor in eliminating undesirable reflections in the output pulse. BNC female connectors are supplied for input and output terminations.