Reflectometer for measuring SWR in the frequency range 1-60 MHz. Power 0,001-200 Watt. Scheme, description

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Reflectometer for measuring SWR in the frequency range 1-60 MHz. Power 0,001-200 watts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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The current transformer T1 is made on a ferrite ring M1000-3000NM (A.1) K12x6x4,5. The primary winding with PEV-2 wire with a diameter of 1,5 mm is one turn.

Reflectometer for measuring SWR in the frequency range 1-60 MHz. Power 0,001-200 watts

The secondary winding is made with a PEV-2 wire with a diameter of 0,22 mm in two wires, three twists per 1 cm, - 10 turns. Connect the beginning of one wire to the end of another to obtain a midpoint according to the circuit diagram.

The voltage transformer T2 is made on a similar ferrite ring and contains one winding with a tap, - 19 turns + 1 turn with MGTF-0,07 wire. The reflectometer is balanced at a frequency of 29 MHz, at a matched load of 50 ohms, with a tuning resistor SP3-19b 470 ohms.

All resistors with a power of at least 0,25 watts. 120 ohm resistors must be selected with a minimum spread in value for better balancing of the reflectometer.

Author: G.G. Sokol (UA6CL), ua6cl@nvrsk.net; Publication: cxem.net

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