[FrancoItaly]

Originally Posted by Dubulumach

Hello Francoitaly

Esteban cabrera Grinok also had shown us how to simply stumilate "FM receiver", better word RF-sniffer.

May i ask you whay you haven't used freq.offset for main 'Halo 4046 chip' ?. For example sweep working freq, in some LF freq, range of interest.? Why did you have used only fixed (semi-variable) VCO voltage ? Main 'Halo chip' should search and lock 'Halo signal' at any particular frequency where phenomenon was occured not at fixed freq. It is soon impossible to find correct 'Halo-positions' of five 20-turns potentiometers manually. Honestly I know a man who can do it even with 6 potentiometers in same time.
Also why you haven't used some sort of AGC to regulate fine amount of reference signal, because 'Halo-signal' is variable in time and space.

Also there is a simple trick to going on mV range 'Halo-signal' of amplitude demodulator or even going on uV, trying to dig out very tiny 'Halo-signals' from the background noise floor, and reconstruct detected useful signal analogue or digitally. You as ex-EE sure know how.

I've forgot to say maybe the most important stuff, which is all real working lrls are detectors (active or passive types) ) of Second Magnetic Field Phenomenon, (not derivation of primary vectorial field), which is in natural essence Shock-Wave or better had great Tesla said, Sound-Wave of Aether. Simply to understand kind of compression/decompression waves, which under special circumstances even could be a standing-waves, a Magnetic standing waves. Mathematical apparatus already has written but.... everything must be at the right time and righ place for the Renaissance.

Best regards
Dubulumach

Hi Dubulumach,
What you say is interesting but it is beyond my knowledge. But as I see it, it is not necessary to elaborate in this direction, I leave this task to others, certainly more competent than me. My lrl works in the range of 2.5Mhz to 10Mhz frequencies and with an input frequency in the 80Mhz - 120Mhz range. In this frequency range there is no particular that allows a greater sensitivity or some discrimination. The version with CD4046 was designed to achieve some discrimination and in the original (unpublished) version the phase changes were compared with the amplitude variations, but I did not get positive results and so I decided to post only the part related to the phase changes. I have always recommended the version with the quartz oscillator because it is easier to make and the sensitivity is practically the same. Finally I want to add that it is not practical to increase the sensitivity too much otherwise the compass effect appears and this makes the tool very difficult to use.
Best Regards.