This is a updated collection of easy to build projects for radio amateurs and swl's. See all my projects in the older posts down this blog.
Have fun.
73 John

Wednesday, June 29, 2011

Z-Match 100 and mini Z-Match

FIRST TEST WITH A  4C65 TOROID, LATER A T200-2 WAS USED

 FINAL VERSION WITH THE T200-6 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 gave me sufficient tuning range.The final version has the T200-6 toroid and a metal cabinet to provide a better HF isolation. Being a high-pass type it contributes to less receiver noise.  The capacitors are radio types and can be used up to 150 Watts. 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.

Translate

Solar data and HF conditions

QRZ.com logbook