MDF-1 Direction Finding Receiver
Frequency Range: The manual doesn't mention the range other than saying "spark waves".
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
|MDF-1 Operators Manual (Courtesy Laval Desbiens via Spectralumni)|
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