On 10/23/24 15:49, Mike Smith VE9AA wrote: > No need Art. > PI*D*T=L > 3.14159 * Diameter * #Turns of coax = total Length > > Mike VE9AA Duh. Also pointed out by Steve K0XP. Of course. Maybe not precise, but close enough. -- Art Greenberg WA2LLN art at artg.tv