K7ITM wrote:


To put some numbers on what Paul suggested:

If I want an unloaded coil Q of 2000 at 10MHz,

I stopped here.


I'd expect to need a....

No way you'll ever see 2000 Q at 10 Mcs. Can't happen. Some guys are
approaching 2000 at 1 MC BCB but there's lots of expensive hoops to jump
through to reach that point. Simply cannot be had at 10 Mcs. 200-300
on a good SW coil is about all that can be achieved.



If you have very sensitive earphones (and sensitive ears!) and a good
antenna, what may matter more than keeping the loss down to an
absolute minimum is getting rid of interfering signals.

Thats Q.

=
It's a really good idea to check out what others have done to advance
the art of winding high Q coils for AM broadcast band frequencies, and
of the circuits to use those coils to best advantage.

Indeed. But that agreed to there's no method to make the same numbers
and techniques work at 10 Mcs. You really cannot achieve the numbers on
SW as you can BCB given the 10x frequency difference.