Q. Thankyou for your previous reply about the coil. With an MK484, a thicker wire coil I wound onto a ferrite rod, does produce medium wave signals, with a 500 pf variable. But this coil I bought and tried doesn't seem to amplify anything - I connected terminals 1, 2 as mentioned, as in the data etc. even with a wire out the window connected to one end of the coil. The length of the coil conducts, checked with a meter, from one soldered terminal to the other(s). The input impedance of the MK484 is high - 4 megohms - is this the problem perhaps? Thankyou.
A. Hi Harry, thank you for your question. 4 mega ohm is about right for the input impedance of a MK484, unfortunately we cannot undertake design work or fault finding for you but offer generic advice. I found this useful link with lots of information you might find useful.