![]() ![]() ![]() An example is measuring the parasitic elements of a beam antenna. This no connection measurement capability is handy for other purposes as well. Just bring the coil close to the tuned circuit s coil and tune the GDO while watching for a dip in its meter reading. The external coil allows you to measure the frequency of a tuned circuit without any electrical connection to it. A GDO is a tunable oscillator with the coil mounted outside of the chassis. ![]() Amateurs have been using grid-dip oscillators (GDOs) at least since While these days they no longer have a vacuum-tube grid to dip, the name seems to have stuck. It still works, although the coil socket has become intermittent over the years, which makes it a bit frustrating to use. ![]() It weighs over 2 pounds and must be plugged into the wall to obtain power for its 6AF4 vacuum tube. It s an Eico model 710 that covers 0.4 to 250 MHz with 8 plug-in coils. Istill have my first grid-dip oscillator, purchased at a flea market about 30 years ago. 1 By Alan Bloom, N1AL A Modern GDO The Gate Dip Oscillator Building an RF circuit? Use an updated version of an indispensable and legendary piece of equipment to test it the dipper. ![]()
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