Missing Antenna Coil | How to Calculate Inductance & Build One

Building a replacement Antenna Coil for a MECK DA-601 TRF receiver using a Ferrite Toroid F50-61 after calculating the required inductance then winding the secondary w/ 28 AWG magnet wire and the primary w/ 26 AWG magnet wire.
Excel formula example for the secondary based on my TRF receiver:
=25330/((437-13)/(((1.7/0.535)^2)-1)*1.7^2)
A great resource:
toroids.info/FT50-61.php
LC Calculations Made Simple
• LC Calculations Made S...
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#restoreoldradios

[@DERB_Seymour_Indiana]

Very nice work Don. I like the way you figure this stuff out. :)

[@RestoreOldRadios]

Much appreciated Doug. Thanks again. Best, Don

[@richardbrobeck2384]

Nice job !

[@RestoreOldRadios]

Thank you, I appreciate it. Best, Don

[@W1RMD]

Great video! I've always been to afraid to build anything with toroids. I've got some from a hamfester years (decades) ago but I have no idea what mix they are and have no idea how to test them so in the junk box they stay. I would LIKE to be able to use them. Thanks for sharing this valuable information with us. Nice to know there is other options out there if I ever get a radio with a bad oscillator coil. Your videos are short, sweet, and to the point. Thanks and take care Don!

[@RestoreOldRadios]

Ryan - place 10 turns of wire on the Toroid and use this formula: uH=(AL*Turns2)/1000 Then use this page as a resource to understand the AL for the particular Toroid: toroids.info/ Hope this helps. Best, Don

[@W1RMD]

@@RestoreOldRadios Great! Thank you. I'll give it a go. I appreciate all you do here.

[@Madmacman4296]

Very nice music great perfect job thanks

[@RestoreOldRadios]

Thanks for listening/watching and reaching out. All the best. Don

[@RepairRadioLab]

is it the same formula to make a bandpass filter for fm receiver?

[@RestoreOldRadios]

A good resource for that application: leleivre.com/rf_chebyshev_BPF.html Best, Don

[@XPFTP]

just come across this channel and vid. if i wish to read i would get a book. iam out