DIY KIT FM Broadcast PLL Professional Exciter - Veronica NRG 2025 - 88-108 MHz.

[BriansBrain]

Probably best to measure between the outermost turns of wire rather than between the solder joints. Otherwise you're not getting a realistic number when the coils mounted on an angle like that

Are they both the same diameter? If you've got a decent set of drill bits, easiest way to measure is to see what the biggest bit is you can fit inside the coil

Hand wound coils are never exact anyway, that's why you've got to bend them a bit when tuning up

These coils are for exactly the same use in NRG RF circuits

They are both 3T x 5.5mm x 1.2mm

The only difference is the distance between the Hole Centers - therefore the actual length of the coil

Veronica 2024 DIY FM Exciter -L3.jpg

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[yellowbeard]

That particular L3 is 2.5 turns (the crookedy one in the previous picture with the wrong length) - might be worth a shot rewinding it, but it's probably not going to cure everything...

[BriansBrain]

That particular L3 is 2.5 turns (the crookedy one in the previous picture with the wrong length) - might be worth a shot rewinding it, but it's probably not going to cure everything...

I think it's only 2.5 turns (and not 3) because of hole center of 11.5mm instead of 7.6mm