Additional and Precise Details of my CG - LF to IR Lightning Discriminator Designs.
The illustrations below are additional documents of a simple loop antenna designed with a Coax [75 ohm] Loop. Experiments with a Hula-Hoop 8 Turn 30mil magnetic wire [transformer wire] design with similar results. The Magnetic Induction Loop was substituted for the ‘Reference Diode’. Therefore all the ‘AND’ comparisons [point of processor input] were done at the point of input to the Optical Infrared [nano meter wave length] The Infra-Red can be any IR Emitter with a 10 degree aperture facing upward. This detects CG and CC as well from about 50 miles in any weather condition [cuts through atmospheric moisture]
Both amplifiers need to be adjusted for ‘Gain’ to optimize the Distance of the noise filter.
Unit tracked thunderstorms from 100 miles [magnetic] and precisely located them within 0 .1 miles from about 30 miles to direct overhead, and produced or plotted vs time a perfect ‘V’ shape plot of the CG cells as they moved in and out of my station [similar to Tempest or Air plots]
The TI LOG114 [Burr Brown] was used as a logarithmic [160dB] amplifier processor. Other DC to 1 MHz amps can also be used such as Analog Devices Log Amps or your own design using a LM358 with a PNP transistor in a feed forward [feedback] instead of a 1 meg ohm fixed resistor. [see TI-LOG114, or AD8304]
The LF frequency was Zero to 10Khz, or B-Dot [current]. Do not use the 500Khz band [see graph]
The IR detector detects SPRITES [see Vonnegut Weed 1980] from over the horizon ~[100-200 miles] as well as CC and CG discharges.
This design overcomes all the previous ‘noise clutter’ near your station
Below are my experimental loop antennas, comparisons of details vs frequency