The Air Route Surveillance Radar-Model 1E (ARSR-1E) is a 1970s analog radar. It is a long-range radar system with a maximum detection range of 200 nautical miles (nmi). The ARSR-1E is a surveillance system used to detect azimuth and slant range of en route aircraft operating between terminal areas. It also provides weather intensity data.

The ARSR-lE is an FAA two dimensional L-band (1215- 1400 MHz) air-route-surveillance radar (ARSR) with a conventional magnetron feeding 400 kW peak power into an amplitron (crossed-field amplifier) to provide an additional 10 dB gain. The amplitron may be switched in or out as required by the operator. Amplitrons are characterized by a very wide noise floor only 40-60 dB below the fundamental. In many ARSR’S, including this one, a bandpass filter has been used to reduce the spurious sidebands outside the 1220-1380 MHz range.

ARSR-1E This ARSR-lE does not use the 1220-1380 MHz bandpass filter often installed with ARSR-lE’S to reduce energy radiated by the crossed-field amplifier (amplitron) outside the frequency of operation. Above 1500 MHz, 7 dB should be added to the measured values to correct for a missing calibration factor. The peaks at 1000 MHz, 1010 MHz, and 1030 MHz are from TACAN and interrogator beacons. The responses around 1090 MHz represent interrogator beacon replies.

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