Location

CUTLER, MAINE RUGBY, ENGLAND CANAL ZONE JIM CREEK, WASH. LUALUALEl, HAWAII FT. COLLINS, COLO. ANNAPOLIS, MD, PODEBRADY, CZECH. FT. COLLINS, COLO. MAINFLINGEN, GERMANY MOSCOW, USSR DROITWICH, UK ANGARSK, USSR ENKOPING, SWEDEN STOCKHOLM, SWEDEN PARÍS, ¡FRANCE TOKYO, JAPAN RUGBY, ENGLAND PRAGUE. CZECH. GREENBELT, MD

LOWER HUTT, NEW ZEALAND

OTTAWA, CANADA

SHANGHAI, CHINA NÉUCHATEL, SWITZERLAND ROME, ITALY TORINO, ITALY

BUENOS AIRES, ARGENTINA

MOSCOW, USSR

MAUI, HAWAII JOHANNESBURG, SOUTH

AFRICA OLIFANTSFORTEIN, SOUTH AFRICA

NEW DELHI, INDIA

missions on their frequencies just as we are in our ham bands. An effort is being made to get all governments to cooperate in closing down the bootleggers.

Table 2 is a list of hourly modulation schedules for the most prominent foreign stations,

VLF transmissions

The high frequency transmissions are more than accurate enough for ham use. However, due to propagation instabilities they are not good enough for today's missile work.

In order to achieve a frequency of one part in 1010 it was necessary to average HF transmissions for a period of weeks. Now, using VLF transmissions, it is possible to achieve this accuracy in a single days observation— anywhere in the world! This is due to the fact that the VLF transmissions follow the curvature of the earth as if the surface of the

A typical standard frequency receiver manufactured by Gertsch. it is fully transistorized and receives the Canadian CHU signals in addition to WWV/WWVH. Audio frequency filters are provided for 440, 600 and 1000 Hz tones. Provision is included for oscilloscope monitoring of beat frequencies.

earth and the Ionosphere form a gigantic waveguide.

YLF has an added strategic advantage in that it penetrates water and can be received by submarines while they are submerged. Several of the YLF stations in able 1 (Those

Coll

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