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Spectrum Management - From the Early Years to the 1990s by Laval Desbiens

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Early Spectrum Scanners

 

EA-PAN2 sweeping panoramic receiver

 

Photo taken at the Beaumont Monitoring station, January 1959

 

Representation of the film obtained from a sweep


Film direction --------------------------------->>>

1

- - - - - - -

- - - - - -

- - - - - -

- - - - - -

etc ...

2 ...   ...
3 ..
4 ...
5
6
7 ------ ------
8
9 .. .. . . . . .
0 . .

..........................................>>> Time


Section of band studied, e.g., 2.1, 2.2, 2.3, MHz etc.,

depending on the frequency band chosen between 2 and 30 MHz.

 

Frequency markers generated by the multivibrator. Operators had to interpolate between 10 kHz markers .

 

The dots or dashes show activity on the band, with dashes indicating longer wave activity and dots indicating intermittent activity.

 

Spurious transmissions from an industrial source.

 

Teb Uber recorder

 

Note the mechanical arm connecting the unit to a VHF receiver.

A choice of gear wheels made it possible to adjust the width of the sweep and the system's selectivity.

(Photo at the Montreal District Office circa 1970)

 

Today, all of that is possible and attained with more informations using computers and programming !

 

Spectrum Management - From the Early Years to the 1990s by Laval Desbiens

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