On Apr 25, 6:51*pm, "Graeme Zimmer" wrote:
It's been done: Have a look at:

An electro-mechanical RX for VLF.http://www.wireless.org.uk/mechrx.htm

............. Zim

Very elegant! And no, I believe that photo etching a thousand poles
or more on
a copper-clad should be very possible with laser printing of the
master. The manufacturing
technology wouldn't be steampunk even if the results are