Yes - I was given this tip by someone else yesterday, Kevin ( my apologies
to the original tipster - I'm in another location now, and can't recall who
it was!).
As you say, the problem is to find such a radio these days - though I'm
certainly going to look out for one because 0.3mH to 2.8mH is an ideal range
to have.
Martin. GW3UCJ
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Here is one effortless method that I have used for years to tune a random
wire for LF reception:
First, find an old AM car radio that tunes with three ganged movable
ferrite slugs and extract the tuning unit.
The three coils are all shielded from each other and can be series
connected in any order and polarity to maximise the total inductance. One
unit tested here allows continuous variation from 0.3mH to 2.8mH.
On occasion, I have connected a fixed inductor in series to increase the
maximum possible inductance.
I guess the major problem is to find a suitable old car radio - not
variable capacitor tuned.
Kevin ZL4MD
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