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Winner - Andre
03-16-2009, 12:26 PM, (This post was last modified: 03-18-2009, 12:26 PM by Der Landser.)
#1
Winner - Andre
What is this device and what is it's purpose?

I am looking for specifics, the designator/name of the device and it's specific use/purpose.

[Image: WWII_Picture_Quiz_01.jpg]
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03-16-2009, 01:53 PM,
#2
RE: What is this device?
SCR 271 US Army fixed radar set?

Operating at 3 meters (100 MHz), with a peak power of 100 kW, a pulse width from 10 to 25 microseconds, and a PRF of 621 Hz

Detect aircraft
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Chris
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03-17-2009, 07:16 AM, (This post was last modified: 03-17-2009, 07:27 AM by Der Landser.)
#3
RE: What is this device?
Excellent guess, unfortunately not the correct one. The picture doesn't do this array justice, it is a much larger array than the SCR-271. The array in the picture is approximately 100' tall and 300' wide. The physical size of the array is directly related to the operating frequency of the array.
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03-17-2009, 11:35 AM,
#4
RE: What is this device?
Yeah, I thought it wasn't big enough either but what the heck.
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Chris
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03-17-2009, 09:44 PM,
#5
RE: What is this device?
X-Leitstrahlbake (Direction Beacon) Knickebein
Knickebein operated around 10 meters (30 MHz)
German radio navigation systems
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03-18-2009, 12:23 PM,
#6
RE: What is this device?
Correct.

The array pictured is a German Knickebein (Bent Knee) Blind Bombing System antenna. Knickebein was developed from Lorenz beam technology that was pioneered as a blind landing aid for Lufthansa in 1934. The first figure depicts the basics of the Lorenz Beam Blind Landing System.

[Image: lorenz.gif]

Essentially, the Knickebein system transmitted two lobes or beams from the array. A series of Morse code style dots were transmitted on one of the lobes, while a series of Morse code style dashes were transmitted on the other lobe. As an aircraft flew along the beams, it would receive a series of Morse code dots if it was to the left of track or a series of Morse code dashes if it was to the right of track. If the aircraft was directly on track, it would simultaneously receive both the Morse code dots and dashes from both lobes, resulting in a solid tone. The second figure depicts the basics of Knickebein Blind Bombing System operation.

[Image: knickebein.gif]

In actual operation, a Knickebein transmitter at one location was aimed at the target. The bombers would fly toward the target along a line of bearing defined by the beams of the first Knickebein transmitter. A second Knickebein transmitter located at a separate location would also be aimed at the target. As the bombers flew along the beams of the first Knickebein transmitter, they would arrive at a point where the beams of the second Knickebein transmitter intersected the beams of the first. When the bombers received the signal from the second Knickebein transmitter, they would drop their bombs on the target. The accuracy of the Knickebein system was reputed to be within a few hundred meters at its extreme range.

Congratulations to Andre!
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