WWVB broadcasts on 60 kHz. I am not sure there is a "best." Just asking for opinions or experience. Interference is an issue locally, as my oscilloscope blocks the signal if it is within a few feet.
After searching I have found 3 or maybe 3-1/2 choices I need to decide between:
1) Shielded loop. Several designs using bicycle wheels, electrical conduit pipe, copper water pipe and so forth. This one uses shielded RG58 or RG59 cable:
http://www.febo.com/time-freq/wwvb/antenna/
2) "Conventional" air-core loop:
http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf
See, page 16. Note: made from ribbon cable.
3) Ferrite-loop:
http://prc68.com/I/Loop.shtml
http://webpages.charter.net/ekyle/wwvbant.pdf
4) Ferrite-sleeve (counts as one-half):
Sorry about the you tube. The construction article I saved is lengthy.
I did not find any source that compared the various versions. The ferrite sleeve is quite expensive, if you use American-sourced ferrite (type 33 ferrite alone is >$100). However, the other three options are not particularly expensive. For either the shielded loop or simple air-core, I would probably opt for a 2 to 3 foot square.
My question: Any experience or opinions on the first three types listed?
Regards, John
After searching I have found 3 or maybe 3-1/2 choices I need to decide between:
1) Shielded loop. Several designs using bicycle wheels, electrical conduit pipe, copper water pipe and so forth. This one uses shielded RG58 or RG59 cable:
http://www.febo.com/time-freq/wwvb/antenna/
2) "Conventional" air-core loop:
http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf
See, page 16. Note: made from ribbon cable.
3) Ferrite-loop:
http://prc68.com/I/Loop.shtml
http://webpages.charter.net/ekyle/wwvbant.pdf
4) Ferrite-sleeve (counts as one-half):
I did not find any source that compared the various versions. The ferrite sleeve is quite expensive, if you use American-sourced ferrite (type 33 ferrite alone is >$100). However, the other three options are not particularly expensive. For either the shielded loop or simple air-core, I would probably opt for a 2 to 3 foot square.
My question: Any experience or opinions on the first three types listed?
Regards, John