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Using Moxgen figures for 28.5MHz generated using 2mm wire, changing to 9mm throughout results in a drop to 27.9MHz and using 17mm throughout results in a resonant frequency of around 27.6MHz so you do need to put in something larger than thin wire into Moxgen.

So if you use Moxgen to calculate sizes for the frequency you want using the midpoint of the pipe sizes, 13mm for the pipe, then you'll be about right. I did a model for 28.5MHz generated using 13mm pipe. Without changing the dimensions I then redid it using 9mm for all the wires and then 17mm for them all and the difference between using 9mm throughout and using 17mm throughout was 200kHz certainly not enough to be worrying about. RF flows on the surface of a conductor, not through the middle, so the fact you're using pipe is irrelevant.

[QUOTE="M0GVZ, post: 482438, member: 22312"] Using Moxgen figures for 28.5MHz generated using 2mm wire, changing to 9mm throughout results in a drop to 27.9MHz and using 17mm throughout results in a resonant frequency of around 27.6MHz so you do need to put in something larger than thin wire into Moxgen. So if you use Moxgen to calculate sizes for the frequency you want using the midpoint of the pipe sizes, 13mm for the pipe, then you'll be about right. I did a model for 28.5MHz generated using 13mm pipe. Without changing the dimensions I then redid it using 9mm for all the wires and then 17mm for them all and the difference between using 9mm throughout and using 17mm throughout was 200kHz certainly not enough to be worrying about. RF flows on the surface of a conductor, not through the middle, so the fact you're using pipe is irrelevant. [/QUOTE]

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