WIRELESS BEACON TRANSMITTER Instructional Handbook. Trinity House. Approx 1926.
A fasinating workshop handbook for the WIRELESS BEACON TRANSMITTER (WB2 TX) for Flamborough Head Light House. The station code was "FB" sent in morse code (during fair weather) every 6 minutes on 289Kc/s. The wavelength of transmission was 1,000 meters, and the system of transmission was that known as Interrupted Continuous Wave (I.C.W.) During fog weather the signal was repeated once every 4 minutes. The morse letters "FB" were repeated continuously for approx. 48 seconds, followed by a prolonged dash of 10 seconds duration and finally by one repetition of the call sign ("FB"), the whole transmission occupying a total period of exactly 60 seconds.
Click to hear FB FB FB in morse!
The Marconi morse key AS No300A was used on this station in emergencies only. Such as failure of the timing clocks.
Below is a picture titled "GENERAL LAY-OUT OF PLANT AND APPARATUS"
This final example from the book is the "WIRELESS PLANT. Pictorial Diagram". The Marconi key AS300A would have been connected to the Main Switchboard - (the large wall mounted fixture to the left of center).