>
>>
>> I have always used the above formula to determine the proper wire/tubing
>> size when designing tank coils. I have never had a coil get hot; so far,
>so good!
>
>I have always tried to use the biggest gauge that would fit and hoped it
>adequate. Skin effect makes it hard to work out the exact dissipation, and
>the Q is governed my many other things, but a good rule is to assume that
>the input that does not appear as RF or hot air from the anode is lost in
>the tank coil.
>
>I am currently working on an amplifier using the assumption that I am
>unlikely to burn out 3/16 inch copper tube with a pair of 4CX250Bs.
For a 2m amplifier using a pair of 4CX250Bs, 3/16 inch copper tubing
would be much too small and lossey due to skin effect. I would use
2-inch Cu ribbon for such a tank.
- Rich..., 805.386.3734, www.vcnet.com/measures.
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