Hi,
I have two grid-dippers (actually one is a gate-dipper) and I find that both of them are "approximate". We can get improved accuracy if we monitor the GDO oscillator with a good, stable receiver. So even more fussing. The old ways DO still work. I once plotted the curves for a Hammarlund single xtal IF filter with phasing control. I used a signal generator, variable attenuator, pencil and graph paper. It took several weeks of daily work ( about an hour per day) but I got all the same results as the guy with the spectrum anayzler/tracking generator. He did it in only a few minutes.
There are some amazing digital electronic gadgets that can be used for not much money. There are some to specifically measure inductance and capacitance and often have several other measurement features as well. Spend more time constructing and less time scratching your head and pencil :)
Of course, doing some of those things the old hard way can keep your skills sharpened and might even be an enjoyable facet of the hobby.
73,
Bill KU8H
bark less - wag more
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On 6/30/21 8:22 AM, JonI via groups.io wrote:
Tony,
Interesting note about LCR meters. No, I don't have one. I was under the impression that just building the filter would be sufficient. If the calculations the filter software produced are only approximate anyway, I wouldn't think the meter would help anyway. Just a guess. On the other hand, I have an old Heathkit grid dip meter. I suppose I could use that and calculate using LC combination.
Jon
