Quote:
Originally Posted by stevehertz
Quote:
Originally Posted by Bazz4CQJ
Well, if a passive loop seems interesting, you have to wonder what an active loop might be like, which brings us back to posts 2&3.
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Indeed, I think I'm going that way. They are expensive though.
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Not if you build one. I think the Wellbrook clone is do-able for ~£20; the main components are
two transistors and two ferrite beads. The construction of a Wellbrook clone has been described in detail in a BVWS bulletin by a member of this forum who decided
not to use the tiny PCB which can be bought. The one challenge about the Wellbroke clone is making the multi-winding transformer using a binocular ferrite core, but that's a question of time/effort rather than expense.
There are other designs. David (EBT) is using a design by Paul Tempest (also in BVWS). There's an amateur in Bulgaria who started building magloops as a hobby but now runs a business doing it. His older designs are around.
I suspect that the big difference between the various designs is how they perform at higher frequencies, but as you seem to be mainly interested in MW/LW, they might all do a good job. My Wellbrook clone does a reasonable job on the 80m amateur band and stands a good comparison against my inverted V.
Cannot comment on the Tecsun; have not previously encountered them.
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