![]() ![]() A long ferrite rod can reduce the number of turns by as much as 50% to 60%. A ferrite core will reduce the number of turns by 10% to 25%, depending upon the size of the ferrite lump, and how far it is screwed into the former. The formulas assume that there is NO ferrite, or brass core to the coil. ![]() I use two adaptions to Wheelers formula, one adaption for single layer coils and another for multi-layer (pile wound) coils. There are several formulas for calculating the number of turns required in any given application, but the results seem to differ quite a lot from one formula to another. To answer the first question for those who are interested in calculating coil turns, read on. A GDO is one of the most tools I posess, and I will describe one of these in another posting in the near future. Naturally the size of the coil former you use will affect the turns needed for a particular frequency, so this "starting" point is very rough and is only intended to get you in the right vicinity. I have many times given the ROUGH "starting" point:. Several people have asked me about determining the number of turns of wire for a particular frequency when building QRP radio projects. ![]()
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