Re: Loop ideas for superhet?
- Sounds like a great project!
What about a varactor-tuned, coupled loop? It could use two loops, or have
the coupling loop go to the antenna inputs, while the main loop is tuned.
One can certainly make one with a standard capacitor, but if you use a
battery-operated, tuned loop, it incorporates more "modern" technology,
which is what you're aiming for, right? NTE618 varactors are an ideal choice
for this project.
Alternatively, what about a super-size passive double-tuned ferrite loop
system? You basically get several rods and epoxy them together, making one
thick, long rod. Windings go on accordingly, with respective tuning. These
would be most efficient - still using modern ferrites, and can even be
finished with a "retro" look if you wish.
Just a few ideas... Feel free to email me off-line if you need some simple
baising schematics for the varactors, should you wish to use them in your
design. I've built several crystal sets using varactors, and they worked
great. Since the detectors were passive, they still qualify as crystal sets.