[TowerTalk] DIY Air Wound Coils

[Richard Karlquist]

Can you cite some examples of plastics that have high loss at HF and low
loss at UHF 

or vice versa?  I've never encountered that phenomenon. 

The web site (plasticfantasticlibrary) doesn't appear to give an
information about 

dielectric constant and dissipation factor.  Did I somehow miss where
this info was 

listed?

---
Rick Karlquist
N6RK 

On 2023-01-18 05:56, Brian Beezley wrote:

> 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
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