[Lowfer] coil guts

[John Andrews]

Bill,

> The AC resistance (loss) at these frequencies is approximately
proportional
> to the wire diameter (not the area, as is the case at DC). You would have
~
> 2.5X increase in coil loss by using #22 instead of #14. That should be a
> significant portion of the total loss of the whole system.

Maybe not all that significant. Say that he has 20 ohms in ground loss (the
radiation resistance might be 0.03 ohms).  The #14 coil might have a
realistic RF resistance of 5 ohms, and the #22 coil would be 12 ohms. For
the usual 1 watt, that gives a base current of 0.2 A for the #14 coil, and
0.176 A for the #22 coil. That's 1 dB of field strength difference. There
are times when that dB might be handy, but it may not be worth the extra
effort.

John Andrews