Публикуется в электронном виде на правах учебного курсового проекта.

Repeaters in the irregular ultra high friquency local area networks

The repeaters has used as an interconnection units and this provides a compatibility of other mode units in such networks: an IR, a SS and other. The first repeater type can recieve a radiosignal in one mode and the transmits in other mode. The second repeater type can change the modulated signal's friquency with the defined alhorythm. This networks has not fixed friquency channels but has a flow friquency channels for a connection. The many channels runs through ranges all time with collisions that likes to "a pear-to-pear" in the ordinal wires networks. This is an unpossibility reason for a listening such transmitters with an ordinal radioscanner: a many transmitters changes the own friquency all time with the high speed that an equal to 1 kHz/s...10 MHz/s that made the many sweeps in the many friquencies channels in the range. A finding of this is not a simple problem with the pelengator equipment.



The simplest repeater's scheme for the RLAN safety.

The superregeneration cascade with VT1 transistor is used as the first cascade in this scheme. A recieved signal has detected then amplified with a VT2 and a VT3 and then detected with diods a VD3 and a VD4. The voltage will up on the circuit C13R12 then takes a friquency up with a VD1 with a sensitivity that control by a R12. The first cascade is an amplifier and a detector and is a transmitter with the small output power. A circuit a L1 is an antenna's transformator. An any RLAN-node has scanning range for such repeater then "to hook" this and has control for the signal friquency after this. This is likes to "the two dancer's dance". Often such schemes has the processing with a computer's sound cards and the bigger output transmitter's power.

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