SECRET
S950-113-2(EinC)
MEMORANDUM
15 Jun 59
Ref CCE Memo 10-36-80/5 (JDPG) 23 Apr 59
ATSC
Gap Filler Radar (FPS-18) - Interference
The following 15 gap filler stations have been checked for interference with other communications facilities known to exist in the areas:
C16B - Atikokan
C15A - Nipigon
C15B - Silver Falls
C9C - Elliot Lake
C119B - Chapleau
C3c - Algonquin Park *
C4B - NObel
C4A - Buck Horn
C2B - La Macaza
C1A - Grand Fond *
C6A - St Cecil
C5E - St Cleophas
C5A - Scotch Settlement *
C11A - New Yarmouth
C5B - Todd Mountain
The information concerning the communications facilities was obtained from the following sources:
The criteria used for the analysis was based on the following assumptions:
The fourth harmonic of the Gap Fillers falls directly in the frequency band of the proposed Bell Telephone TJ microwave short haul equipment. However, because Bell have been unable to advise when and where this equipment will be installed TJ has not been considered.
Based on the above all of the above sites are considered satisfactory with exception of the following for the reasons indiated:-
NRC (Radio Physics Laboratory) are installing or, are planning to install a radio telescope in the general area (Lat 45º 35', Long 78º 03' approx) and radar interference from this gap filler could seriously affect its operation. NRC have been advised of this proposed radar site but it is recommended that this matter be resolved with them before any work is started. Otherwise, this station is considered satisfactory.
This site is co-located with a New Brunswick Telephone microwave station (now under construction) and with a local highway patrol microwave station. If resiting is impossible or very difficult special precautions may reduce the interference.
This site is co-located with a Quebec Hydro microwave system. The same remarks as indicated in (b) above also apply
As additional information becomes available, it may be necessary to amend this report. You will be notified immediately of any change in status.
A report on the remaining gap filler sites will be submitted later.
(HJ VonBaeyer) Dr.
EinC
6-8632