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Transcript
Z-Rock ATU Schematic W5USJ Drawing 4 Nov 2014 Coax/Longwire Based on W6JJZ transformer design VATI Bridge Operate Transmitter 51 Ω 2w Adjust S1A S1B Tuner 350 pF Load Tune 9T Tayloe Style Tuning 51 Ω 2w P 5T Indicator Bridge 1N4148 R3 51 Ω 2w S 25T FT37-43 350 pF S2 - Center Off R4 1 kΩ 470 pF D1 .1 F See Z-Rock ATU Drawing for assembly LED 1 High Intensity Red LED Hi Z S3A 12T 9T 350 pF 350 pF R1 R2 T130-6 18T ` Longwire Balanced Line 6T Low Z S3B Counterpoise S4 Open = Balanced Closed = Coax/Long Wire Double-tuned circuit from Charlie Logren's design information and notes. Output link coils are wound centered on the ground tap and as closely coupled as possible. Interweaving is desired. Switch S1 in Adjust positon The tuning indicator bridge is switched into adjust position. Adjusting the tuner changes the RF voltage at point A. (Possible slight change at R2/R3 junction.) Useful Illumination to 50 mW or Less RF in (Transmitter) R2 An unmatched load (antenna) unbalances the bridge. A voltage difference is developed high enough for the 1:5 step-up transformer T1 to illuminate the LED. R1 RF A RF Out ~ 2.4 Vdc << R3 Tuner Unknown Rload jX Antenna) << Equivalent Circuit, Classic Wheatstone/Maxwell Bridge As a match is achieved, the equivalent R load comes closer jX load is ~equal to thevalues of resistors R1, R2 and R3, the voltage across the bridge is balanced and the LED goes out or nearly out. This is the matched load condition. The RF voltage at the junction of R2 and R3 will be nearly constant. The RF voltage at point A will change with adjustment of the tuner controls. The DC voltage at the junction of the 1N34 and 1k resistor should change from several volts to about 1.5 volt or less when the LED goes out. At this point, the VSWR will be at its lowest value. Use a Hi-Z RF probe to measure the RF voltages.
