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Old 30-04-23, 04:20
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Mike Kelly Mike Kelly is offline
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This is a good article by Dave Lawrence. From what I have read about variometers, they are not ideal in a electrical sense , the rotary inductor or roller tuner is a better method of electrically adding length to the antenna.

https://www.qsl.net/ve3bdb/antmeas.html

These days, you can buy a nanoNVA device for hobby use. The VNA has the ability to analyze the complex impedance of the 19 set variometer and antenna and give a direct result in various forms. The nanoVNA are easy to buy on most of the popular retail platforms . And small spectrum analyzers are available for hobby use as well.

https://www.aliexpress.com/item/1005...d=gkAQdhUhNQmF

https://www.aliexpress.com/item/1005...170019037756_1
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Last edited by Mike Kelly; 30-04-23 at 04:37.
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