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QRP PROJECT ZM-4 Manual

Atu for symmetrical and unsymmetrical antennas
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DL-QRP-AG
ZM-4 ATU for symmetrical and unsymmetrical Antennas
Please read the manual compleate for better understanding before you start assembling
Manual Version 1.3UK
© QRPproject Molchstr. 15 12524 Berlin Alt-Glienicke http://www.QRPproject.de Telefon: +49(30) 85 96 13 23 e-mail: support@QRPproject.de
Handbucherstellung: Peter Zenker DL2FI email:dl2fi@qrpproject.de
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Summary of Contents for QRP PROJECT ZM-4

  • Page 1 DL-QRP-AG ZM-4 ATU for symmetrical and unsymmetrical Antennas Please read the manual compleate for better understanding before you start assembling Manual Version 1.3UK © QRPproject Molchstr. 15 12524 Berlin Alt-Glienicke http://www.QRPproject.de Telefon: +49(30) 85 96 13 23 e-mail: support@QRPproject.de Handbucherstellung: Peter Zenker DL2FI email:dl2fi@qrpproject.de...
  • Page 2 To make it easy for you we use wires of different colours for Some time ago I started the development of ZM-4. The reason was not that each part of the complete winding. Those who are not familiar with Torro- I have not been satisfied with the ZM-2, but during time I had found 2 ids should at least read the following introduction.
  • Page 3 Example: Let´s start with the shorter coupling winding. It contains of 4 turns. The coupling must be as symmetrical around This core counts 6 Turns the ground point of the main winding as possible. Remember, grounding point is named GND, actually it is the connection The ZM4 main Torroit needs 1 main winding (the resonate winding) between the red and the brown wire.
  • Page 4 If you are ready, shorten the ends corresponding to the holes and remove the isolation at both ends. Now put the complete torroid to the PCB and fit all wire ends in the corresponding holes. Tighten the ends, they should hold the Torroid flat on the PCB.

  • Page 5: Connectors And Switches

    the marked with 1, the tap to number 5 and the longer end to number 20. wires have been cut very short directly above the solder! If they are too long they may produce a short betwwen PCB and enclosure. If ok, set the PCB in the slot, there is only one slot fitting exactly.
  • Page 6 device. As long as the antenna is off the 50 Ohm feed match, the LED will lighten. If you forget to switch to operate for QSO, your signal will be 6dB down, because only a quarter of the power is coupled to your antenna Now the backplane, left to right: BNC IN Connect your transceiver here.
  • Page 7 Doppeldrehko 2 x 270 pF L1 = 34 Wdg L2 = 16 Wdg L3 = 4 Wdg 220pF SW 2 L1 und L3 symmetrisch um Geschlossen= unsymmetrisch 1N34 Masseanzapf 270pF ZM-4 QRPproject Foto: Fred, HB9JCP (only demonstration, different wire colours)