Rule of thumb for winding a coil for the AM band

Ian, welcome to our forum.
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Do you have any formal training or just starting out?


Most AM broadcast frequencies normally use 300 mH. plus the variable capacitor which
will be from 350 mmfd down to 50 mmfd.

but if you want to make an inductor match as frequency, then you would have to know what frequency is desired / or required. you have to have two items that you have on hand.

Examples:
Enter the known Capacitor value
Enter the known Frequency value
Formula for fining Inductance L
L= 1/ C x ( 2 x PI x F ) Squared

Then there are online calculators to give you answers to calculating and construction of coils.

You may be need to look at some other web pages that have oriented online calculators.
Are you asking that a rule of thumb exists? There are also Nomograms (Shortcut visual charts instead of Calculators)
There are rules of thumbs for coils Right hand rule and left hand rule - Basic Electrical/Electronic text book stuff

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If my answers are not fitting your needs, then organize your inquiry(s) with more details or ask in different way.
Please let me know!

I am a relative newbie. A lot of the documentation around is great for telling you how many turns on a particular-sized former but don't say what value of inductance you should be aiming for. Is there a rule of thumb for this?
Thanks,
Ian