Operations Building in October 1945. (DND
photo submitted by Doug Stewart)
The short lattice tower at the left appears to be fitted with a Canadian
Marconi MDF-5 DF loop antenna while the tower second from the right has
a Canadian Marconi FM12 DF aerial outfit.
The guy wires which support the stripped masts are separated into non
resonant lengths by the use of egg insulators. The idea is not to
have any section of guy wire at or near the resonance point of the
operating frequency or any of its harmonics. This prevents the re-radiation
of RF energy by the guy wires when transmitting or the absorption of RF
energy when receiving. Note the dark, elevated service line attached to
the left upper portion of the building. |