I have an inverted L and using a hairpin coil to match in on 160M. One coil is 6 inches OD the other is 2 inches OD. I have been thinking about making another hairpin with wire wrapped around a toroid donut,
I have noticed with the 6 inch coil I have a higher noise level on 160M and hear BCI pretty strong on certain frequencies on other bands. The 2 inch coil has lower noise level on 160M and BCI is reduced on other bands. If I use a toroid hairpin What would happen to the noise level and BCI? My guess is both will be reduced a bit more. Also what hairpin matching coil should I use and why? -- Jim K9TF _________________ Topband Reflector