Topband: Air Wound Coil

[Wes Stewart]

I agree with Rick.  The advantage to the edge-wound inductor is the better heat 
dissipation; needed because the Q is lower :-)

Wes  N7WS

On 8/30/2018 5:44 PM, Richard (Rick) Karlquist wrote:
>
>
> On 8/30/2018 3:44 PM, Guy Olinger K2AV wrote:
>
>> You can also get the edge-wound (flat) 1/4 inch by 1/16 inch coil that they
>> use in the ATR-30 rotary coil tuner. That's a killer piece of copper.
>>
>
> Actually no.  Edge wound is inferior in terms of Q to round wire.
> It only makes sense for a rotary coil, where it needs to be edge
> wound for mechanical reasons.  On a flat strip, the current
> crowds to the two edges for the same reasons that cause skin
> effect, thereby wasting most of the copper.  Round wires are
> immune from this because they have no edges.
>
> 73
> Rick N6RK
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