Re: Hi from a new member with a question. (coil spacing off the ferrite)
As you note, of course air is the lowest loss spacer but it's not very easy to wind a coil spaced over ferrite using just air. :) Styrofoam is probably the next least-lossy dielectric, and can often be found in sheets of varying thickness where a single layer or maybe several layers add up to the correct coil spacing. As for Litz, if you can obtain some, try to get as many strands of #46 gauge as your budget allows. I would suggest that a minimum of 100 strands of Litz be used (100/46) otherwise the improvement over using plain non-Litz wire won't be much. 175/46 and 330/46 are common sizes and are good choices, with 330/46 working better. And then there's the "Big Litz" such as 660/46 which works even better but which is much more expensive. Also remember the larger Litz is larger in diameter so make sure your coil form width can handle the extra winding width, and also that you will need somewhat more turns for the larger size Litz you use, to tune the same frequency range using the same variable capacitor since the inductance for a given number of turns will decrease the larger the wire diameter that is used.
Good luck and please keep us informed of your experiments and
results! And it must be fun to listen to Radio Caroline live;
you're fortunate to be able to receive the signal, even in
On 1/29/2017 10:17 AM, Steven mont633@... [ultralightdx] wrote: