Gap Filler Detail

1959 – National Archives of Canada

10-36-80/5 (DRDP)

MEMORANDUM

21 Apr 59

Ref S949-103 TD9082P (ATSC) 23 Mar 59
DCEC 10-36-80/5 (JDPG) 7 Apr 59

ATSC

Gap Filler Radar Stations -
Building and Tower Design Criteria

Since the technical role of the Gap Filler Radar Stations is precisely the same as the Mid-Canada Line Doppler Detection stations, namely; unattended sites, with provisions for technicians to occupy quarters at any site for periods of at least seven days at a time, when necessary, the standard type one buildings are approved for use on all Gap Filler Stations operating in Canada. (Attached AFHQ drwgs S-13-1045-1 to 41 refer). In addition to these drawings, a sketch of the telecom equipment room layout is attached. It is suggested that a great deal of time and public expense will be saved by the use of the existing DDS building designs for Gap Filler sites.

The AB467 tower modification drawings to accept rigid radomes have been passd to Mr Alexander under separate cover. Mr Alexander has been asked to contact the tower design contractor, Dressor Ideco, Columbus Ohio to obtain the necessary tower data now required by CCE.

Anwers to queries on para 2 of the DCEC referenced Memo are listed as follows:

  1. The tower must be located as close to the Gap Filler Building equipment room as possible to limit the wave guide run and subsequently transmission loss. If it becomes necessary, owing to difficult terrain at some sites, to reduce the size of the building, living accommodations may be remoted down the hill a short distance.

  2. Remoting the power supply may be practical, but not desirable. Individual sites requiring this action, should be re-examined for possible re-siting.

  3. Assuming wind loading of the tower is considered, if CCE consider this practical from a construction point of view, no objections exist in so far as the radar operation is concerned.

  4. owing to the fact that reflections are obtained from buildings, towers and trees, no obstruction within 500 feet of the center of the antenna should be higher than 10 feet below the antenna's horizontal plane.

  5. The AB467 tower (modified for rigid radome) will be of open construction.

  6. The towers will be euipped with rigid radomes, however, heating is not necessary.

This Directorate will be pleased to supply additional information is required.

(JG Mathieson) G/C
DRDP
6-7651