NR-20 project progress report no. 1 March 1951 - March 1952

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TypeTechnical Report
AbstractThe NR20 Receiver is an instantaneous, all-round-looking, wide band SH/F D/F set designed to indicate the bearings of pulse transmissions. Bearings are shown unambiguously as radial lines on a cathode-ray tube. The frequency range covered by the present model is approximately 8,000 to 11,500 Mc (2.6 to 3.75 cm.), with somewhat degraded performance at the extremes of the band. The equipment is intended for installation either on shipboard or on an aircraft. Although, in its present state, only 8-to 11-Kmc signals may be detected, it is anticipated, that by the addition of a second antenna system, provision will be made for the reception of S-band signals. It should be noted that the present antenna system is capable of receiving signals polarized in only the horizontal plane. For other polarlizations different antennas will be required. The principal advantage of a direction finder of this type is that it provides a probability of intercept of approximately unity for signals within the useful range. This is in contrast to the rotating-type of direction finder which has a much smaller probability of intercept. The NR20 equipment to be described is similar in principle to the British Admiralty Type CX403 Direction Finder.
Publication date
PublisherNational Research Council of Canada
AffiliationNational Research Council Canada
NoteDeclassified in 1985.
Peer reviewedNo
NPARC number21272356
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Record identifierbf739340-108c-40e3-a6bb-93f0fdd37a37
Record created2014-11-24
Record modified2016-10-03
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