23-02-2016, 11:06 PM
I posted a link to your topic in a few places Trevor, but the one I have most hope for is the radio board, (Lawrence has got the jump on mentioning them I see!), there is a membership of knowledgeable personalities who frequent the crystal set forum there, and I would expect there may be some who will give your ideas a try, and possibly respond or start their own topic prompted by your ideas. The only loop antenna that I have recently tried that works as well is one from the TRB moderator, Jim Kearman that uses an RF transformer to increase the inductance of a given loop, details at http://kr1s.kearman.com/html/hooploop.html .
Lawrence is on the money as far as his comments re the rf transformers function of transferring the signal as efficiently as possible so as to preserve the selectivity of the tuned circuit, but I still can't get my head round why its better at it than doing the same thing with the link winding.
I tried the loop with an Mullard OA10 switching diode, it seems quite a bit better in listening tests, for volume, than the 91 I'd been using, possibly has a slightly lower vf, maybe maybe worth your giving one a try Trevor.
Regards. Andy.
Lawrence is on the money as far as his comments re the rf transformers function of transferring the signal as efficiently as possible so as to preserve the selectivity of the tuned circuit, but I still can't get my head round why its better at it than doing the same thing with the link winding.
I tried the loop with an Mullard OA10 switching diode, it seems quite a bit better in listening tests, for volume, than the 91 I'd been using, possibly has a slightly lower vf, maybe maybe worth your giving one a try Trevor.
Regards. Andy.
