Leitrim - Old Antennas

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This 1965 aerial  photo, from the  City of Ottawa web site shows an octagon-like clearing which was intended to facilitate the installation of a DF system. such as the AN/GRD-6 .(City of Ottawa aerial photo)

Since the CDAA installation never materialized, the land was re-purposed for the installation of the AN/GRD-6 HF/DF system. In evidence are the 8 monopole antennas which were part of  the system. The History of CBNRC confirms that a GRD-6 was in service at Leitrim until at least 1972, when the new Pusher system was built. Click on image to enlarge. (City of Ottawa aerial photo)

	This topographical map of CFS Leitrim  is dated 1970 but shows information dated as 1968. In evidence are the three rhombic arrays plus the CDAA site that was started but never constructed. (Map image from the collection of Bill Robinson)
	This is a general view of the Leitrim property taken on May 11, 1970 from an altitude of 2,500 feet. North is approximately at the 11 o'clock position. The Pusher antenna has not been built yet but it shows up in photo A23612-12 dated September 1973. Its construction can therefore be narrowed to the 1970-1973 time frame. The rectangular building with the dark grey roof is the new operations building built in 1968 for about $500,000.  (National Air Photo Library photo # A22250-32)
	This is a rendering of the three rhombic arrays on the property. Unfortunately the third array could not be rendered since it was not possible to locate a photo which spanned the necessary distance. In April 1972, the rhombics and the GRD-6 at Leitrim were to be dismantled following the evaluation and acceptance of the PUSHER system (National Air Photo Library photo # A22250-32)

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CONTRIBUTORS AND REFERENCES:

1) Bill Robinson <newman-robinson(at)rogers.com>
2) http://www.troywoodintarsia.com/special/sweeping.html
3) City of Ottawa  https://maps.ottawa.ca/geoottawa/
 

Jan 31/25