wrote:
hello,

After completing my AF amp and BFO, I'm in the process of doing IF/BFO
diode ring mixer.
I understood that it is a good idea (or even mandatory?) to follow DBM
with a diplexer.

I found one from http://www.qrp.pops.net/dip2.htm

My question is: how on earth should I wind those 10mH inductors? My
calculations show that I should wind 487 turns on FT37-43 (which is
obviously impossible), or 437 turns on FT50-43 (which is hard..but
should be possible).

Any other ideas how to make 10mH inductors for AF diplexer?

thanks!

Just buy some Toko 10RB 10mH inductors. I've use them in that type of
diplexer and they work very well. They are available in the UK from
Rapid Electronics and other suppliers.

73, Leon