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Writer's picturextgaby

How the ATU was build

Bottom view:


Top view:


Schematic diagram

Air coils:

  • Wire diameter = 0.8 mm

  • Diameter pen = 9.7 mm

L1 = 2 turns L2 = 3 turns L3 = 5 turns L4 = 7 turns L5 = 12 turns


Other coils:

L6 = 18 turns on a T50 - 2 (red) core Amidon

L7 = 28 turns on a T68 - 2 (red) core Amidon


Capacitors are SMD 0805 type see pictures for detail.




For tuner 2 I replaced C5 (220pF) with 180 pf to make tuning easier.

For tuner 2 I replaced L7 (28 turns) with 26 to make tuning easier

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