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FIRST TEST WITH A 4C65 TOROID, LATER A T200-2 WAS USED
FINAL VERSION WITH THE T200-6 TOROID |
This is a antennatuner with wide range tuning for antennas with a Z of + 50 Ohms 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.
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THE TUNING AID IN MY MINI Z-MATCH
Another mini Zmatch i made for the field.
VELCRO MOUNTED MICRO Z-MATCH |
