I spent years. #43 is NOT a good material for HF because of
manufacturing tolerances. The problem is that we must measure each choke
to take tolerances into account, but correct measurement is a
destructive process. I measured at least a thousand chokes, wound on
cores at the limits of component tolerances.
See the discussion in
http://k9yc.com/2018Cookbook.pdf
73, Jim K9YC
On 12/22/2021 1:21 PM, David Eckhardt wrote:
Yes, 31 material is the preferred material, especially for 160 and 75/80
meters. 40-meters is roughly the break-even frequency. 15-meters on
upward, yes, 43 material is best. I spent almost the whole month of
January and into February measuring various CMCs using both 43 and 31
material.
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|