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The VLF-transmitters for an irregular Radio Local Area Networks (RLAN)

An irregular Radio Local Area Networks design can use the VLF-transmitters for 6.9 kHz...1.5 MHz (LW). In buildings we can not made effective classic antennas for a VLF-range because of a sizes that is an equals to 100 m...100 km. But we can made design with the magnet antennas.

An idea is here: a city communications has extremely long original iron "antennas" that is a waterpipes. A such equipment intruder through all floors in a buildings and in an undergrounds with many irons pipes and a communication cables then we can have biggest magnetic antenna and a radiowaves in a LW and a VLF-range running through this without decreasing in a practice. For the transmission radiowave energy through such "antenna" we can use an inductive connection with the solenoids and the magnetic antennas that must be placed near (5-10 cm) to waterpipes. The magnet antennas effect can be observed by a simple LW-reciever that need place to a waterpipe and this will increase a radiostations signal level. The radiowaves in a VLF-range run through 50 m deep under groung.



W1 - A magnet antenna like to ordinal LW/MW-reciever magnet antennas design. W2 - An induction solenoid on iron watepipe. W3 - A magnetic antenna on iron bar. W4 - A magnetic antenna on many ferromagnetic rings with big size of bar.

This designs can use for a transmitting and for a listening of a VLF-radiosignal.

A power amplifiers for a VLF-range




The power amplifier with lamp. The circuit L1 is an antenna. This scheme has not a harmonics or has very low harmonics level.



The power amplifier with a tiristor. The circuit L3 is an antenna. This scheme has many harmonics.

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