>Should I just stick with 31
>Material on HF receivers or do you have additional suggestions?
The virtue of the #31 material is that when you use the right number
of turns, it is effective for suppression the AM broadcast band to
VHF. As noted in my tutorial (cited in an earlier post), the choke
must be tuned to the frequency range where you want to use it. The
resulting choke will have a Q of about 0.4, so it will be effective
over a frequency range of about 4:1. You could, for example, use a
choke with many turns to cover 160-40M, and a second one with fewer
turns to cover 30-10M. The two chokes would be in series on the same
line that you're choking.
Above 5MHz, the #43 material as good or slightly better. Below 4
MHz, the #31 material much superior.
73,
Jim Brown K9YC
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