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Cobaltblue · 30th Nov 2022, 10:40 am

Hi Bob and welcome to the forum.

Its A GDO (Grid Dip Oscillator)

Its used for checking the resonant frequency of a circuit.

There's a tutorial here.

https://www.electronics-notes.com/ar...to-use-gdo.php

Cheers

Mike T

30th Nov 2022, 10:40 am	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,865	Re: Eddystone equipment Hi Bob and welcome to the forum. Its A GDO (Grid Dip Oscillator) Its used for checking the resonant frequency of a circuit. There's a tutorial here. https://www.electronics-notes.com/ar...to-use-gdo.php Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk