EARS IF RECEIVERS SWITCHING CIRCUIT

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Authors
  1. Curnow, J.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN);Applied Silicon Inc Canada, Ottawa ONT (CAN)
Abstract
This report presents the final test results for the IF receivers following the addition of switches to the input section of each of the sixteen IF receiver boards used in the Experimental Array Radar System (EARS). The addition of the fast RF switches allows the inputs to be disconnected from the radar front end. The purpose of the switches is to correct a possible oscillation problem in the IF receiver circuits when low attenuations are used. The oscillations are caused by the initial saturation level radar return, known as the 'main bang'. It is the first signal received by the arrays following the application of the enable gate to the TWTA. Its amplitude is much greater than any returns from the targets of interest, at ranges from 500 metres to twenty kilometres. The main bang can be blanked by opening the switches during the duration of the main bang. The switches are mounted directly on each receiver board, beside the first input amplifier. They are controlled by a single TTL level input signal which is supplied by the Master Timing Unit (MTU).
Keywords
EARS (Experimental Array Radar System);IF Receiver;Intermediate frequencies;Multichannel architecture;Sidelobe cancellation;Side Lobe Canceller (SLC);Exciter;TWTA;Master Timing Unit;Offset Video;Vertical array;Attenuator;SPST;X-band;Main bang;Local Control Interface Unit
Report Number
DREO-CR-98-622;974-55126-01 — Contract Report; Technical Report (Final)
Date of publication
19 Jul 1995
Number of Pages
24
DSTKIM No
98-02873
CANDIS No
509879
Format(s):
Hardcopy;Document Image stored on Optical Disk

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