Transradar-a narrow-band radar relay equipment using storage capacitors

Transmission of radar video signals for long distances over voice-frequency circuits involves reduction of the bandwidth occupied, which usually entails a storage system between radar and transmission channel. In transradar the video sigs. are stored sequentially on a bank of capacitors (250-1000, depending on the range resolution required) which discharge at a low rate, and hence compress the bandwidth. The integrated outputs are read and delivered to the transmission system, which uses vestigial sideband techniques. A special slow-scan indicator may be used at the receiving end, but a conventional indicator is usually employed, fed from a condenser storage bank, similar to the one at the receiving end but with inverse operating mode. Azimuth and range resolution are given as functions of aerial rotation time, both for the normal 10 kc/s bandwidth transmission channel and for the 3 kc/s channel over which acceptable but reduced quality performance is possible.