I have now started adding a few pages to my website for 500kHz. First 
off is my transmitter which may be of interest.

Find it at http://www.davesergeant.com/mf/tx.htm

You may find typos etc and I cannot guarantee the circuits are 100% 
identical to what I have built! If you see any errors please let me 
know.

I will be adding some background information on the main page 
(currently a mess, only uploaded to stop you getting a silly BTYahoo 
'not found' page..). Also details of the receiver and antenna and 
experiences of the band. Watch this space...

73 Dave G3YMC

http://www.davesergeant.com