67 lines
3.3 KiB
Plaintext
67 lines
3.3 KiB
Plaintext
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(word processor parameters LM=8, RM=75, TM=2, BM=2)
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Taken from KeelyNet BBS (214) 324-3501
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Sponsored by Vangard Sciences
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PO BOX 1031
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Mesquite, TX 75150
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There are ABSOLUTELY NO RESTRICTIONS
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on duplicating, publishing or distributing the
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files on KeelyNet except where noted!
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January 16,1994
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NEONDET.ASC
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--------------------------------------------------------------------
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This file shared with KeelyNet courtesy of Joel McClain.
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Also take the diagram NEONDET.GIF, see also MAGALT.ZIP.
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The schematic, NEONDET.GIF, is a derivative of a microwave detector
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described in the February, 1980, "Ham Radio" magazine. As
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originally created, the circuit's purpose is to detect microwave RF
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standing waves, but with minor modification, it can also be used as
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an effective scalar wave detector.
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The schematic shows a round magnet epoxied to the NE-2 lamp, to help
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isolate it from EM signals. Additionally, the circuit should be
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enclosed in a metal box, or "Faraday Cage", with shielded I/O
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connectors.
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The power source consists of eight 9V batteries. Battery life is
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very nearly the same as shelf life, because the lamp is operated in
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"starvation" mode, drawing approximately 0.1ma.
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The 25K and 250K potentiometers are adjusted first to fire the NE-2,
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at approximately 60-70 volts, then adjusted until only the tip of
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the cathode electrode glows. The 100K pot is adjusted for optimum
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output gain.
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Notes:
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1. The 741 can be replaced with a 1458 cascade amplifier for
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better results.
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2. The RF loops in the NE-2 leads are mandatory to reduce
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interference as well as lamp current noise.
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3. Component values are not critical, and can be changed as
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required for the type of output device.
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4. Removing the magnet and Faraday Cage, and adding a
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capacitively coupled loop antenna will permit use as a
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microwave EM detector.
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If you have comments or other information relating to such topics
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as this paper covers, please upload to KeelyNet or send to the
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Vangard Sciences address as listed on the first page.
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Thank you for your consideration, interest and support.
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Jerry W. Decker.........Ron Barker...........Chuck Henderson
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Vangard Sciences/KeelyNet
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If we can be of service, you may contact
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Jerry at (214) 324-8741 or Ron at (214) 242-9346
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--------------------------------------------------------------------
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