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G6Tanuki · 15th Dec 2019, 5:38 pm

Those were always known as "tuning wands" in my day. Brass one end {to act as a shorted turn and lower the inductance), ferrite the other end (to increase the inductance).

You don't need much of either to get a noticeable effect!

Reminds me of another 'tweak' I came across some years back - to increase the inductance of a coil, wind a bit of recording-tape round it! This has more than once been used here to add a smidgin of needed extra ""L" to bring to resonance an IF coil whose slug has been cracked/wedged by the Phantom Twiddler.

15th Dec 2019, 5:38 pm	#4
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Magic Stick Those were always known as "tuning wands" in my day. Brass one end {to act as a shorted turn and lower the inductance), ferrite the other end (to increase the inductance). You don't need much of either to get a noticeable effect! Reminds me of another 'tweak' I came across some years back - to increase the inductance of a coil, wind a bit of recording-tape round it! This has more than once been used here to add a smidgin of needed extra ""L" to bring to resonance an IF coil whose slug has been cracked/wedged by the Phantom Twiddler.