[Lowfer] Coil Forms at 1750-Meters

[Mike WE0H]

Put a piece of the coil form you are thinking of using in a microwave 
oven with a glass of water for a load. Run it for a minute or two. If 
the plastic coil form heats up, don't use that material. If it's cold, 
then it's good to go.

Mike
WE0H


EP Swynar wrote:
> Hi All,
>
> I know from articles that I've read in the past that black PVC plastic plumber's tubing is a poor choice for antenna trap coil forms at HF...but how does it rate for 160-190-KHz...?
>
> The goal here is to wind my own RF tank coil / antenna link for a HB tube-type transmitter for that band, & I'm wondering what I might come to expect in terms of losses, performance, etc. BEFORE I start cranking wire...! Hi Hi
>
> Any & all comments based upon real-world experiences are solicited and welcomed! Thanks in advance...
>
> ~73~ Eddy VE3CUI - VE3XZ