The Soviets had a VLF Pulse transmitter in 1950's

San Francisco CA

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The Soviets had a VLF Pulse transmitter in 1950's installed in American Counsel operated on Frequencies below sonar frequency. The effects caused by the naval sonar. For these wants to show the effects of active middle frequency sonar on human. the very low frequency (VLF: 3 kHz to 300kHz) hearing damage and behavioural change at levels of sounds exposure lower than those that would cause physiological damage to the auditory system....They Know Exactly what the Brain Damage is, I remember in 1950's Soviets used Low Frequency Active Sonar (LFA) PULSER that was trained on American Embassy in Moscow. THIS WAS 1950's. I read it in Popular Electronics and QST Ham Radio ARRL Magazine. They KNOW what it is. EMI Stories Compendium - EMC Standards https://www.emcstandards.co.uk › files › compendiu... PDF Apr 20, 2020 — emergency transmitters on these frequencies can only be detected at ground level for messing peoples minds a form of low-energy radio-frequency (LERF) jammer, which can be used to cause brain damage What is low frequency sonar? Low-Frequency Active (LFA) The U.S. Navy plans to deploy a new submarine detection system, known as Low Frequency Active Sonar (LFA), throughout 80% of the world's oceans. LFA is based on the fact that very low frequency sound [100-1000 Hz] can travel great distances and detect quiet submarines.Jun 21, 1997 Electronic and Information Warfare - Department of Computer... https://www.cl.cam.ac.uk › Papers › SEv2-c19 PDF by S Tzu — For decades, electronic warfare has been a separate subject from computer security... such as radar, infrared and sonar; a communications links which take sensor... jammers, and finally other devices such as electromagnetic pulse generators.... network operated by the USA, Canada, the UK, Australia and New Zealand. Sonar systems used in warfare must detect targets at a reasonable distance and this constrains the working frequency range to about 1–100 kHz, with a typical wavelength of 1.5 m–1.5 cm. Low-Frequency Active (LFA) The U.S. Navy plans to deploy a new submarine detection system, known as Low Frequency Active Sonar (LFA), throughout 80% of the world's oceans. LFA is based on the fact that very low frequency sound [100-1000 Hz] can travel great distances and detect quiet submarines.Jun 21, 1997 low-frequency active sonar (LFA) https://www.intechopen.com/books/sonar-systems/the-effect-of-sonar-on-human-hearing The non-intuitive nature of decibels and the different reference values of air and water have led to a plethora of misconceptions concerning the magnitude and potential effects of noise levels in air and water. The magnitude of sound pressure levels in water is normally described by sound pressure on a dB scale relative to a reference root-meansquare (rms) pressure of 1 μPa (dB re 1 μPa). hearing damage and behavioural change at levels of sounds exposure lower than those that would cause physiological damage to the auditory system. Continued emission of noise can increase the damage, due to the “habituation” to a familiar sound to which it is difficult to react more strongly. The “habituation” is known as being provoked by continued acoustical stimuli, reducing the hearing sensitivity to high-level sounds; the hearing sensitivity may be regulated at both conductive (stapedial reflex) and sensorineural levels (adaptation). For these reasons, the introduction of new types of military sonar, such as low-frequency system, should proceed with caution; the low-frequency sounds produced by the systems will travel much farther than the mid-frequency sonar sounds currently causing concern. Studies on marine animals have demonstrated that changes in hair bundle density paralleled changes in hair cell nucleus density, indicating that entire hair cells disappeared following noise exposure; the inner ear damage is characterised by a permanent threshold elevation after an exposure to white noise ranging in intensity from 130 to 170 dB re 1 μPa for 24 h. . The term sonar is also used for the equipment used to generate and receive the sound. The range of frequencies used in sonar systems vary from infrasonic to ultrasonic. Sonar uses frequencies which are too much high-pitched (up to 120,000 cycles per second) for human ears to hear. Although there is a growing concern among the public that human generated sounds in the marine environment could have deleterious impacts on aquatic organisms, only few studies address this concern on the effects of these sounds on the human auditory system. The effects of sound on the human auditory system have been the subject of several studies, but one question needs to be resolved yet: the effects caused by the naval sonar. For these reasons this chapter wants to show the effects of active middle frequency sonar on human. Published data from humans under water in literature are scarce and sometimes use different terminology with regard to sound levels. For example sound pressure levels measured in air are normally reported with a reference pressure of 20μPa whereas levels measured in water are normally reported with a reference pressure of 1μPa. Therefore, in the diving environment it is recommended to use SPL (sound pressure level) threshold with reference pressure of one micropascal (1 μPa) for both water and air measurements in order to compare values from different sources. Although there are differences among the ears of different species, the basic processes of hearing are the same between marine and terrestrial mammals. For this reason, some of the previous considerations can be applied on humans. Although the true correlation between sonar and hearing damage is difficult to show, (absence of technical information, level of sound exposure and other environmental variables) this study wants to show the effects of sonar on human auditory system.