P57N Portable Directional Finder |
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| This radio direction finder was first built in 1932 by Telefunken. It's total frequency range is 3-20 MHz. This range is divided into three sub-sections of 3 to 6 MHz, 6 to 12 MHz, and 12 to 20 MHz. This is accomplished with three frequency modules that are inserted into the top of the P57N. These modules look like clothes irons. The P57N comes with a set of head phones, a tripod in a canvas-leather carrying case, and a surveyor's transit which allows for quick direction determination. |
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| Specifications: |
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| Principle: |
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| Frequency Ranges: |
3 frequency ranges |
| Power Requirements: |
Battery power: 4x4, 8NC10 batteries, 150 V Anode battery |
| Speaker system: |
Either two headsets or two special speakers (LS-203/U) |
| Case material: |
Metal case |
| Vacuum Tubes: |
RE084, 3 x RE084K, 2 x RES094 |
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This is one of the photos of the P57N before I received it. |
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This is one of the photos of the P57N before I received it. |
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This is one of the photos of the P57N before I received it. The canvas/leather bag for the tripod is to the left. |
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This is the case when I received it. It weighs 89 KG. |
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The case as I've opened it. |
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This is the inside of the lid with all of the antenna components neatly strapped in place. |
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Here are the frequency modules for the 6 to 12 MHz on the left and 12 to 20 MHz on the right. |
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Here are the two Telefunken headsets that came with the P57N. They are very high quality early headsets. |
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This is the plug on the headsets with spring-loaded pins. |
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The P57N set up.on the tripod with the antenna. |
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This is the signal sensitivity meter, and the sensitivity scaling switch. |
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The manufacturer's data. |
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The Volt meter. |
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From the side. |
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Rear view |
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