The calibrator functions as a CW wavemeter with continuous coverage of a nominal frequency band of 1.5 - 10.0 Mc/s.
The calibrator power supplies are obtained from the socket engraved XTAL CAL on the Wireless Set 62.
1. Selector switch to 500kc/s position.
A crystal controlled oscillator provides fixed frequency signals of 500kc/s to well beyond 10mc/s.
2. Selector switch in DIAL position.
In addition to the 500kc oscillator, a second and variable oscillator (250-500kc) is brought into circuit. This enables all frequencies between 500kc and 10mc to be produced - these frequencies are indicated on the dial on the front panel.
For identification purposes, the calibrator signal is modulated at about 1 cycle per second by means of a neon tube.
The output from the calibrator is taken from the terminal engraved AERIAL on the front panel.
Power Supply (ex WS62)
LT 12v dc at 300ma - series heaters - 1.4v valve heaters.
HT 300v dc at 15ma
Useful output exists on the 2 metre band.
The wire colours in the power lead do not follow convention!!
Beware of selecting the wrong output signal as there are an incredible number of unwanted beats.
© Ian O'Toole, 2009. Page created: 28/04/03 Last updated: 4/12/2009