I haven't built a loop like this, but here is some general info about
ferrite vs. powdered iron...
If the toroid will be used only as a transformer and not as a coil,
then you can use either ferrite or powdered iron. For low-band only work
you could use FT-50-43 or -61. For all bands, I would use -61. FT-50
should be good up to about 50W. The -61 core will require more turns on
gthe secondary. If you use powdered iron, T-50-2 is a far better choice
than -6, especially at lower frequencies.
If you need a coil instead of a xfmr, forget ferrite... it saturates too
easily.
73,
Larry N8LP
Daniel Reynolds wrote:
I'm thinking about building a non-tunable compact loop for 40m (7040) using
RG-8. If I have good success, I'll be making other loops for 20m and 30m
(mono-band / tuned to the CW-QRP frequency). I need some help figuring out
which toroid to buy to build a portable compact loop like is shown here:
http://www.qsl.net/aa5tb/loop.html
It looks like I can buy the cable, toroid, and even the banana plug/bnc adapter
at Ocean State Electronics. My only question is - which toroid core should I
buy for this application? I've seen comments on the web about using a T-50-2
for the Rock Loop, and I've seen other vendors selling a T-50-6 which
supposedly covers the entire HF band. But I cannot find either one at Ocean
State Electronics. For 40m, should I buy a T-50-61? What about 30m? T-50-61 or
-67?
Thanks for your help,
Daniel / AA0NI
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
