A Modern GDO―The 'Gate' Dip Oscillator

Alan Bloom N1AL

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A Modern GDO―The 'Gate' Dip Oscillator

机译：现代GDO-“门”浸入式振荡器

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I still have my first grid-dip oscillator, purchased at a flea market about 30 years ago. It's an Eico model 710 that covers 0.4 to 250 MHz with 8 plug-in coils. It weighs over 2 pounds and must be plugged into the wall to obtain power for its 6AF4 vacuum tube. It still works, although the coil socket has become intermittent over the years, which makes it a bit frustrating to use. Amateurs have been using grid-dip oscillators (GDOs) at least since 1947. While these days they no longer have a vacuum-tube "grid" to dip, the name seems to have stuck. A GDO is a tunable oscillator with the coil mounted outside of the chassis. The external coil allows you to measure the frequency of a tuned circuit without any electrical connection to it. Just bring the coil close to the tuned circuit's coil and tune the GDO while watching for a dip in its meter reading. This "no connection" measurement capability is handy for other purposes as well. An example is measuring the parasitic elements of a beam antenna. Since the parasitic elements have no feedpoint, you can't measure the resonant frequency the normal way, with an SWR meter. A GDO is also perfect for tuning the traps to resonance on a multi-band Yagi.

机译：我仍然有大约30年前在跳蚤市场上购买的第一个栅极倾斜振荡器。这是Eico 710型，具有8个插入式线圈，覆盖0.4至250 MHz。它的重量超过2磅，必须插入墙壁才能为其6AF4真空管供电。尽管多年以来线圈插座已经变得断断续续，但是使用起来还是有些令人沮丧。至少从1947年开始，业余爱好者就一直在使用栅格浸入式振荡器（GDO）。尽管如今，他们不再需要使用真空管“栅格”来浸入，但这个名称似乎已经停滞了。 GDO是可调振荡器，其线圈安装在机箱外部。外部线圈使您无需任何电气连接即可测量调谐电路的频率。只需将线圈靠近调谐电路的线圈并调谐GDO，同时观察其抄表读数是否下降。这种“无连接”的测量功能也可用于其他目的。一个示例是测量波束天线的寄生元件。由于寄生元件没有馈电点，因此无法使用SWR表以正常方式测量谐振频率。 GDO也是调整陷阱以使其在多频段八木上产生共振的理想选择。

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《》 |2003年第5期|p.54-58|共5页
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Alan Bloom N1AL;
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中图分类无线电电子学、电信技术;
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1. Antennas: More on the Grid Dip Oscillator (GDO) [J] . PETER DODD Radio communication . 2010,第5期

机译：天线：更多关于网格浸入式振荡器（GDO）的信息
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4. Effect of protection diodes on the behavior of CMOS gates in the presence of supply dips [C] . Amer, H.H. . 1997

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8. Dips and Slidings of the Forced van der Pol Relaxation Oscillator [R] . Grasman, J. 1981

机译：强制van der pol松弛振荡器的倾角和滑动

A Modern GDO―The 'Gate' Dip Oscillator

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