Tech Page

Projects of members and friends.....

Of antennas and things....

Portable, center-loaded, manual screwdriver, vertical ala Don Johnson. All folds to about 2.5 ft package, including 6 ft mast.

Coil to radials with coil tap.

Coil moves in and out of surrounding metal tube. Small fiberglass rod to right is to move coil up and down. 10 foot telescoping whip above coil.

OK, this is application of above antenna. Notice the radials drooping over front of wings and one of the rear radials on right.	Band fixed by red center coil, with coils for 40m, 20m, 17m. Tuned by bottom coil. This is for use with qrp 40m rig. This one made several qsos back to Shreveport from Dayton Hamvention and packs into a 12 inch bag.
Of tuners for tweaking....
Z-match - tunes a wide range of antennas	This version built with toroid.
Random wire tuner. Inductor is coil around ferrite rod with sliding contact. Tuning LED is to right of SO-239.	Who says tuners must be large? QRP tuner for end-fed 40m half-wave wire. Tuning LED is below switch. Hole between terminals is trimmer capacitor.

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