MDF-1 Direction Finding  Receiver

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Frequency Range: The manual doesn't mention the range other than saying "spark waves".

Use:
1) Marine D/F receiver.
2) The operators manual indicates that this DF type was used by the Radio Division of the Department of Transport.

Circa: 1922 / 1923
Tube lineup: Uses six type 01A tubes

Comment: Although there are circuit diagrams the manual, none of the vacuum tubes are identified.  There is little or no description of the equipment itself, only  its use. . The receiver used in this chassis is designated as the MDFR-1 according to the example held by the Canada Science and Technology Museum.  This suggests that there may have been an second optional receiver version , namely the MDFR-2.

MDF-1 photo courtesy "Canada Science and Technology Museum "

Artifact Markings:  MFG'S PLATE: 'CANADIAN MARCONI COMPANY/ PATENTED 1910. 1922. 1923./ TYPE M.D.F.1. SERIAL'/ TOP PANEL: 'CLOSED CIRCUIT/ TUNING/ RHEOSTAT/ OSCILLATOR/ TUNING/ FILAMENT/ POTENTIOMETER/ RECEIVER/ TYPE MDFR-1/ MARCONI/ CANADA'/ MIDDLE PANELS: 'COUPLING TRANSFORMER/ MARCONI/ CANADA/ TYPE-18632/ SENSE RESISTANCE/ SENSE STAND BY/ DF' 'SENSE COUPLING/ TYPE-18640/ MARCONI/ CANADA' 'INST. NO. 307336 P.S. NO.1974A'/ BOTTOM PANELS: 'EARTHING RELAY/ TYPE 18670/ MARCONI/ CANADA' 'CALIBRATING CHOKES/ TYPE 18564/ MARCONI/ CANADA'/ SIDE TERMINALS: '45 VOLTS 6 VOLTS PHONES' 'FORE AFT PORT STARBD EARTH'F

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Contributors and Credits:

1) Spectralumni http://www.spectralumni.ca
2) Laval Desbiens <desbiens.laval(at)videotron.ca>
3) Canada Science and Technology Museum  http://techno-science.ca/en/collection-research/collection-item.php?id=1993.0229.001
 

July  13/17