VDL-2M Variable Delay Line is used in radio systems to match the time delay of diverse transmission paths. The VDL-2M operates on baseband, voice frequencies and provides a wide range of adjustment. The VDL-2M is typically installed at remote transmitter sites used in paging or simulcast radio systems. Remote control saves time and resources by eliminating the need to send a truck to the remote sites to make adjustments. With a delay range of 0 to 2,000,000 microseconds, the VDL-2M replaces a wide range of conventional delay lines.
Traditional devices have a narrow adjustment range which requires a fixed delay line in series.
Consequently a system can require an assortment of conventional delay lines. In contrast, the VDL-2M provides a universal solution by combining wide range with high resolution. Delay and level is remotely controlled by touch-tones. Since multiple delay lines may serve the same channel, an addressing arrangement is used. This permits units to be controlled individually.