[TowerTalk] DIY Air Wound Coils

Brian Beezley k6sti at att.net
Wed Jan 18 08:56:51 EST 2023


Helpful article on the properties of various 3D-printing plastics:

https://www.3dnatives.com/en/plastics-used-3d-printing110420174/

Check the dielectric constant and dissipation factor of the plastic in 
this comprehensive library:

http://www.plasticfantasticlibrary.com/library/plastic/

The microwave oven test is unreliable. Some materials have high loss at 
HF and low loss at UHF, and vice versa.

Household plastic containers make good coil forms. Guide to identifying 
the plastic from the recycling symbol:

https://www.goodhousekeeping.com/home/g804/recycling-symbols-plastics-460321/

Design your coil with this:

http://ham-radio.com/k6sti/coil.htm

Brian


More information about the TowerTalk mailing list