HHF BN 1501 |
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(Field Intensity Measurement Receiver) |
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This specialized radio direction finder (Funkpeilgerät) was built by the Rhode & Schwarz firm, which makes high-end research and radio equipment to this day. R&S created several models of this receiver; the BN 1500, 1501 and 1502. I am still trying to research the exact applications of this device. The only period photograph of the HHF BN 1501 that I have seen or encountered being used, was with the "Fritz-X", one of Germany's several models of radio-guided smart bombs. This photo was taken in a laboratory environment. The HHF BN 1501 operated on the following frequency ranges: 2.5 to 4 MHz, 4 to 7.3 MHz, 7.3 to 13 MHz, and 13 to 25 MHz. With each change of frequency ranges, an appropriate loop antenna from the accessory box had to be fixed to the top of the receiver. A black direction measurement swivel was attached to the bottom of the receiver, and the whole contraption was placed on a special tripod which held the battery pack suspended above the ground below. This allowed the HHF BN 1501 to be used as a radio direction finder. |
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| Specifications: | |||
| Principle: | Super-Heterodyne Receiver (Überlagerungsempfänger) | ||
| Wave Bands : | 4 frequency ranges | ||
| Power Requirements: | 6 Volt DC filament, 220 Volt DC Anode. Batteries or utility power. | ||
| Speaker system: | This set has no built-in loudspeaker. It requires a separate loudspeaker or headset. | ||
| Case material: | Metal case | ||
| Vacuum Tubes: | 9: ECH11, EF11, EF12, EF12, EF12, EF13, EB11, EBC11, EZ11, 7475 | ||
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The front view of the receiver with the power switched on and headphones attached. |
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The accessory case showing the 4 loop antennas and the direction measurement swivel base. |
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The antennas and the swivel base laid out. |
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The HHF BN 1501 case with the closed lid. |
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Closeup of the front console. |
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The manufacturer's data on the side of the case. |
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The antenna connector socket on top of the receiver. |
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A scan of the manual cover. (Courtesy of the Radiomuseum) |
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A period photo of the complete accessory set from the original manual. (Courtesy of the Radiomuseum) |
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An HHF 150* receiver is being used with a "Fritz-X" radio-guided smart-bomb. (Fritz Trenkle: Die deutschen Funklenkverfahren bis 1945) |
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