This is a updated collection of easy to build projects for radio amateurs and swl's.
Have fun.
73 John

Wednesday, June 29, 2011

Z-Match 100 and mini Z-Match

FIRST TEST WITH A  4C65 TOROID
This is a one for all antenna tuner with wide range tuning on all the HF bands. The tuner is based on a G3WQW  design. A T200-6 should give a better Q but the T200-2 was in stock and gives me sufficient tuning range. Being a high-pass type it contributes to less receiver noise.  The capacitors are radio types and can be used up to 150 Watts. I used a plastic cabinet but a metal type would provide better HF isolation. Using a metal cabinet needs a "floating"mount of the input capacitor. More info about the Z-match design can be found here
Tuning capacitors :http://www.rfparts.com/capacitors/capacitors-antennaload.html

The QRP 160-6 m. mini Z-Match with a T130-2 toroid in a matal cabinet. Polyvaricons are used for tuning within qrp limits. By switching a  270-500 pF capacitor over the left side of C2 (2x 500pF)  the tuning range can be extended. It's possible to tune a doublet antenna on all HF bands. Together with the FT-817 it makes a great qrp combo.
 The mircro Z-Match with 12x5x3 cm ultra portable for 80-6 m. In this tuner a nr. 6 material toroid was used. There is still some room left for a tuning indicator....

QRP tuning indicator . A perfect match is indicated by a bright shining LED , suitible for QRP only. Can be mounted in any QRP tuner at the antenna output. Gives a better reading than the FT-817 internal swr meter.
 THE TUNING AID IN MY MINI Z-MATCH
Another mini Zmatch i made for the field.
VELCRO MOUNTED MICRO Z-MATCH
Disclaimer:I'm not responsable for any damage due to reproduction of my projects.

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