Daniel,
The small powered iron toroids like the T-50-2 and T-50-6 are used for
tuned circuits, as their loss is less. The -2 is used for VHF and the high
end of the HF band; the -6 is used for the mid and low end of the HF
band. The ferrite cores, which begin with F do not work well in tuned
circuits. They begin with an F, like F-50-61 or F-50-43. The latter are
used for baluns, RFI chokes and other than tuned circuits. Most any
electronics supply house carries full line of powered iron
toroids. Amidon which sometimes advertises in QST is a source.
Chas, W1CG
At 02:18 PM 10/6/2004, 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
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