[RFI] Common Mode Choke Materials

[Tony]

All:

I'm looking for mix 75 cores to build a common mode choke similar to the 
one Paul, W1VLF shows in this video.

https://www.youtube.com/watch?v=dcXq6u64HXg

The plots show the choke to be very effective on the 2200 and 630 meter 
bands as well as 160 and 80 which is what I'm looking to use on my 
receive loop.

Not sure what the inside diameter of the cores are that Paul uses, but 
they are large enough to get 25 turns of RG-178 around them.

Any suggestions would be greatly appreciated.

Tony -K2MO