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Author Topic: GDO'ing  (Read 217 times)
K3UIM
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Posts: 347




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« on: June 07, 2019, 05:29:27 PM »

Another ignorant question:

In the "old days" one would, (Read: My time at the helm) when checking the frequency of a coil/variable capacitor, utilize the God given machine called the GDO. … Uh, for the "youngsters" in the audience …(Oh forget it!) It was a simple matter of placing the correct coil assembly into the "path" of the coil you're checking and rotating the GDO dial.

Time passes and toroids enter the market place. I find that that isn't the case anymore. I'm assuming I must couple the GDO via a turn or two on the toroid. But, won't that throw off the correct reading??

Do I need to retake the Novice test? Will John marry Susan? Will … But I digress.

"In the dark" Charlie, K3UIM

… sheesh!! ...
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VK2TIL
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Posts: 625




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« Reply #1 on: June 07, 2019, 06:45:07 PM »

A lightly-coupled link will have negligible effect; this is the usual method;



I don't think that I've ever had to use the link method; I've always had adequate coupling from the leads as shown in (b) above (although not as long).
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VK6YR
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Posts: 13




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« Reply #2 on: June 07, 2019, 07:00:16 PM »

Hi Charlie,
For me, one of the handiest pieces of test gear that I have in my shack is an antenna analyser. For determining LC circuits with toroids simply use a short length of 50 Ohm coax with a single loop passed through the toroid.
Cheers,
Geoff VK6YR
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K3UIM
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Posts: 347




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« Reply #3 on: June 07, 2019, 07:30:43 PM »

Thank you both!! Greatly appreciated!
(I hate being electronically stumped!) Hi.
Charlie, K3UIM
 
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Where I am: You will be!
So be nice to us old fogies!!
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