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small fix: QDX manual_1_19.pdf


 

page 30 L6 should be number of turns 22, not 21

?


 

L8 should be 13


 

Hi Muhsin

No. The turns in the manual are correct.?

This has come up several times before. For a given inductance the theoretical?number of turns by calculation is a non-integer. But practically speaking we must specify an integer number of turns. In order to provide the best build experience, I don't round based on the normal mathematical rule, >= n.5 we round up to n+1, otherwise round down to n. What I do is move to the closest integer that the QRP Labs team have found works best.?

So everyone please continue to follow the manual.?

73 Hans G0UPL



On Sun, Jan 7, 2024 at 11:05?PM Muhsin TA1MHS <muhsin.dogrular@...> wrote:
L8 should be 13


 

T37 AL is 1.5

on the table it takes 1.637 not consitent with the other Ls

73

muhsin TA1MHS


 

Hi Muhsin

Please see previous reply, I already explained this.?

What works best in practice and what is predicted by theory is not always exactly the same. Calculation, modeling, simulation is all one thing. But in the end final values often need to be tweaked by trial and error. This always needs to be remembered throughout the design process.?

In this case, rounding down or up is according to what we know works best from experience (during optimization of the assembled radios).?

73 Hans G0UPL


On Mon, Jan 8, 2024, 12:03?AM Muhsin TA1MHS <muhsin.dogrular@...> wrote:

T37 AL is 1.5

on the table it takes 1.637 not consitent with the other Ls

73

muhsin TA1MHS