Radio for underground communication, working on medium wave VHF buy range reviews manual frequency portable

Radio for underground communications, operating on medium wave.

 

 

Radio for underground communication FERRA L1 is designed primarily for telecommunication in mines and caves (i.e. underground), as well as above ground. The transmission distance above the ground to 100 km under the earth through the rock – 1.2 km (experimentally confirmed).

 

Description

The principle of operation

Specifications

 


Description:

Radio for underground communication FERRA L1 is designed primarily for telecommunication in mines and caves (i.e. underground), as well as above ground.

FERRA L1 – compact radio station for underground and surface radio communications.

The main difference FERRA L1 from all other radio stations – the ability to communicate through the earth, rock, concrete wall, regardless of wire or other guide linesthat were necessary to the former means of underground communication.

Radio for underground communication FERRA L1 uses miniature antennas of the new generation (point of the ferromagnetic emitters), which allows voice communication at distances up to 100 km above the earth without lifting and installation of fixed antennas, and the most important property FERRA – allows you to transmit the radio signal through the rock over long distances.

 


Working principle:

It is known that radio waves of low frequency can penetrate through obstacles, but these radio waves require large antenna size of several tens or even hundreds of meters. Such an antenna is inconvenient to carry, so any existing use of ultrashort radio waves, which is enough for a small antenna, but the connection is only possible in line of sight, or with a small obstacle.

In radio FERRA L1 applied the original ultra-compact resonant antenna. The use of such antenna has made available the use of secondary waves, which can penetrate through solid obstacles hundreds of meters. Heart of the antenna is a special ferrite material and this is reflected in the name of the radio station. From the results of tests and measurements it is known that the antenna size of only 50 cm works just like a whip antenna with a length of 6 meters.

The range of communication above the ground to 100 km.

The experimentally proven range of communication under the earth through the rock without the use of metal rails – 1200 m. (potash mine).

For the radio station L1 FERRA underground doesn’t require any permissions. When used on the surface you need to register radio stations with the appropriate authorities.

 

Specifications:

Features: Value:
Range, MHz Of 0.8-2.0 (optional up to 10)
0,9-1,1 (underground band)
1,8-2,0 (ground range)
The power of the transmitter, W 1, 5
Receiver sensitivity, µv 0,5
Modulation LSB (default), USB (optional)
Modem BPSK, 31 bits/sec
The size of the station, mm 183х126х49
The antenna dimensions, mm 30х30х500
Weight radio with antenna, kg 2
Battery built-in, Li-ion, 12 V, 4.5 A*h.

 

Note: the description of technology on the example of radio for underground communication FERRA L1.