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ANTENTOP- 01- 2017 # 021

Several Universal ATUs for the Whole Amateur HF Band

 

 

 

Figure 12  Simple ATU

 

The first winding of my transformer is contained 3 turns and the second has 30 turns. The first winding is wound with wire from L1 coil. The second winding is wound with wire of 0.3 mm (#27-#25 AWG). However the second wire is depend on the design of the coupling transformer, RF power going in to the antenna and for characteristics of the LED.  Design of the ATU is shown in Figure 13. The front view is shown in Figure 14.

 

The coil wound on the mustard jar L1 is fastened to the case of the ATU using the metal cap as the base mount. From L1 the tap wires go to the switches. It is necessary to keep the length of the wires going to the switches as short as possible.

 

Figure 13 Design of Simple ATU
The capacitor C1 is behind the switch and its calibration is located on the front panel. Because the capacitor has a short in length adjusting shaft, it was lengthened with help of an old ballpoint pen. 

 

Credit Line:

1.     Igor Grigorov. Universal ATU for the HF Bands, Radiolubitel KV and UKV, October 1999, p. 29

2.     Igor Grigorov. Universal ATU for the HF Bands, Radiolubitel, November 1993, p. 43

 

3.     Igor Grigorov. Antennas: Tuning and Adjustment, Radiosoft, Moscow 2002,270 pages.

  References  [1] Peter Linsley (G3PDL) : HF SINGLE COIL "Z-MATCH" ATU // SPRAT p.76. AUTUMN 1993  

 

Figure 14 Front View of Simple ATU

 

 

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December 17, 2017 14:10

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