On 2/3/2018 12:45 AM, John Randall via Topband wrote: What about a helically wound vertical Inv L
73John
Digitally signed mail - John M0ELS
Glad you asked this FAQ: Helical winding is a concept that intuitively makes sense. Unfortunately, if you rigorously analyze it, it makes no sense. A lumped loading coil is always better. I didn't say a helically wound vertical won't work at all; it just will be inferior to a vertical using a conventional loading coil, which is much easier to build as a bonus. The length of wire in a helically loaded vertical is much greater than the length of wire in an equivalent loading coil. Therefore, the resistive loss is much greater in the helical case. For a multi band design, the helically wound antenna is even more of a non starter. 73 Rick N6RK _________________ Topband Reflector Archives - http://www.contesting.com/_topband
