08 Nov 2020 Observations on The Schumann Spectrogram; The Schumann's Symphonies Part G
6Two core issues:
How to decypher the information given from Tomsk; And, how to deal with information from alternate sources, who orient their data in alternate manner from Tomsk's S.O.S.Through seeing other datastream, from alternate sources, we can start seeing a more clear version of what is happening in our immediate environment.
Working through the "module" on how to properly read a Schumann Spectrogram; from Tomsk, and other Antennae operators. Discussions and comparisons between types of Schumann Spectrogram.
Original Link:(http://www.vlf.it/poggi1/schumann.html)
** ** **** roll off above 200Hz to avoid overload by signals well outside the band of interest ** The system is powered by a pair of rechargeble batteries of 8.4 V NiMh. With their 140mAh capacity, they are sufficient to guarantee a day of operation of the system. If you need a greater autonomy, you can assume the use of two small batteries Pbgel of 12V or maybe four cells LiPo if the weight factor is important.The system PC + softwareThe simplest way today to analyze the signal, is the use of a computer with a sound card and an appropriate software. Unfortunately, not all the sound blaster work fine down to those frequencies and is therefore warmly advisable, to test them before using. As a programs for the acquisition, recording and analysis, among the most popular we can mention:
Spectrum Lab for capturing and analyzing in real-time
Baudline & Sonic Visualizer for post processing.
What do I receive?
As anticipated, the system presented offers good reception. In the figure below you can see a recording prepared with Spectrum Lab and acquired with the antenna T of 18m, supported by occasional means as visible in other images. The result is very positive and achieved with little effort and investment.The bands of Schumann resonances are clearly visible, as well as 50Hz albeit its considerable amount does not affect the cleanliness of the acquisition.
General Guidelines
To drive the testing activities quickly towards an efficient configuration, you can consider the following guidelines:
where possible, prefer a "T" antenna structure rather than an "L inverted "
provide means to dampen the mechanical vibrations of the wire as much as possible. For example, the horizontal conductor can be kept in constant traction on one side with a weight that pulls down and dampens the oscillations, thus improving the S/N below 10 Hz
place the front end to the base of the T and from this point starting with a long shielded cable to carry the audio signal to the PC in the shack.
place the ground connection at the same point, that is at the base of the vertical section of the T it is good practice to put the netbook (or a generic PC) to at least a dozen yards from the antenna and the receiver.
This distance is very dependent on the amount of noise generated by the computer and should be checked case by case
test and experiment with the use of an isolation transformer placed between the receiver and the sound card. It's not always needed, but often it helps.
another important caution: the microphone input of sound blaster cards almost always deliver some DC voltage to feed a condenser microphone. It should be blocked with a condenser, before it is grounded by the eventual line transformer above mentioned.
it is better if the electronics of the front end, it is enclosed on shielded case
each mass that perturbs the static electric field in the vicinity of the antenna is transformed into a signal on the spectrogram, especially below 20 Hz. So, things, or people who move around the receiving system, can create artifacts on the received signal. The establishment of an area "not walkable "around the antenna, at least 10 feet from each part of the receiving structure, can be a good starting point.
Avoid as much as possible power sources "alternating" for the devices involved. Battery packs are usually the best choice, they do not generate noise and make the whole system "floating".
Acknowledgement
At the end of this paper, I would like to thank Marco and Andrea IZ5IOW, IZ5TLU for having me light up the curiosity on this matter and Renato IK1QFK and Marco IK1ODO for the competent and valuable help and support of experience.
For those wishing to explore some of the many topics covered in this article, I may suggest to take a look at the bibliography.
Bibliography:
Renato Romero, Radionatura, Sandit Libri, 2006 Albino
Pierluigi Poggi, Active antennas, Sandit Libri, 2011 Albino
AA.VV, Low Level Measurements "Keithley
Daniel H.Scheingold, Transducer interfacing handbook "Analog Devices inc. 1980 - Norwood, Massachusetts USA
it.wikipedia.org / wiki / Risonanza_Schumann
http://www.scribd.com/doc/75455378/30/Ilrumorenegliamplificatorioperazionali
http://www.baudline.com
http://www.vlf.it
http://www.glcoherence.org/monitoringsystem/earthrhythms.html
http://www.qsl.net/dl4yhf/spectra1.html