Errante's 225 Ohm, MULTIBAND HF ANTENNA SYSTEM

  HF Turnstile antennas broadband driver, NOW available as standard!

Patent n.0001347484 (ITAPA20030019) and
Patent n.0001347486 (ITAPA20030021)
Visit www.uibm.gov.it and enter Francesco Errante in the search box to see all of my patents, or verify it directly from the European Patent Office archive HERE and HERE!

Errante's 50/70 Ohm virtual ground balun
Freq. range: from 1 to 30 MHz
RF Power: 2KW CW

N.B. The balun pictured above is available as standard for the following impedance values:

NEW! unbalanced 50 Ohm input to a 225+225 Ohm balanced output to suit the Errante's 225 Ohm, multiband HF antenna system ;

unbalanced 50 Ohm input to a 70 Ohm balanced output to suit an ½ wavelength open dipole antenna;

unbalanced 50 Ohm input to a 300 Ohm balanced output to suit an ½ wavelength folded dipole antenna;

unbalanced 50 Ohm input to a 50 Ohm balanced output to suit an ½ wavelength inverted Vee dipole antenna;

unbalanced 50 Ohm input to a 200 Ohm balanced output to suit a full wavelength, single turn, Deltaloop antenna.

Any other impedance values combination to be manufactured upon special order.

ERRANTE's BALUN : what it is, how it works and how it came to be made.

by Francesco Errante

The virtual ground balun presented hereby is the practical application in the field of the short wave radio communications of what the Author has previously created for scientific purposes. It, infact, descends from the radio-electric circuitry for the suppression of anyone of the two branches of a ½ of wavelength open dipole and from the virtual ground balun for doubling the ½ wavelength folded dipole antenna.
A virtual ground balun represents the ideal device for the correct feeding of dipole and loop antennas. The virtual ground balun carries out many functions at once allowing to:
1) match the RF source impedance to the chosen load while introducing neglectable insertion loss of power;
2) transform the RF signal fed to it into two identical portions with the correct phase angle difference for the natural feeding of open or folded dipoles and loop antennas;
3) obtain a virtual ground node for the correct polarization of its unbalanced port;
4) obtain a common ground path for the dissipation of the charges induced by the electrostatic phenomena;
5) obtain an high de-coupling between its two balanced ports.

The generic virtual ground balun's schematic diagram is shown here below.

The virtual ground balun is housed inside a weatherproof rugged metal enclosure having two separate compartments: one hosts the balun circuitry while the other one protects the coaxial connectors. The said metal enclosure not only ensures an high mechanical robustness and a total stability against the weather agents, it also works as the general electric conductor for all the references to the virtual ground node. Such an enclosure ensures also a full electrostatic shielding of the RF balun transformer circuitry.

Radiondistics claims the originality of the balun's unique electromechanical layout, as well as the balun radio-electric circuitry.

Operational advantages:

Applications:

Prices: Euro 250,00 +V.A.T. and shipping costs. The price of the new 50/225+225 is Euro 300,00 +V.A.T. and shipping costs. For an useful currency converter click here RADIONDISTICS' products carry an unconditional lifetime guarantee.