Early units were technically behind the times in terms of tracking in particular; while the SCR-268 was being introduced, the Germans were upgrading the W�rzburg radar, first to use lobe switching, and finally to conical scan the next year.
22.
To do this, one adds a second antenna with the rotating lobe for reception only, a system known as "'COSRO "', for " Conical Scan on Receive Only " ( compare to "'LORO "', a similar system used against lobe switching radars ).
23.
The SCR-268 was one of the first radar sets to use lobe switching of its receiving antennas as a means to locate AA ( anti-aircraft ) searchlight beams on aircraft . Since it did not lobe-switch its transmitted signal it would be classes as one of the first LORO ( lobe-on-receive-only ) radars.
24.
Early airborne radar systems generally operated purely as tracking systems, with a dedicated radar operator manually " tuning " the system to locate targets in a relatively narrow field-of-view in front of the aircraft . The searching area could be moved using a variety of methods, typically phase-shifting or lobe switching on lower frequency systems that required large antennas, or by moving the radar dish on microwave frequency radars.
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