Re: Reception on Grundig G3 NOT Amazingly Improved with new 80 Ft Longwire Antenna
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Michael <michael.setaazul@...>
Yes, the qsl jpg below from Graeme is the correct
one,
such as I had in mind. I´m not sure what
effect the low-Z
ouput from the long-wire balun might
have on its tuning sharpness,
however. Fig 2A would probably work best. The L/C would
be tuned
to the unwanted frequency to suppress it. Add a
few turns on top
of the tuned L, one end to earth, the other to the 50ohm cable
centre
conductor from the
balun. If overload is still evident, reduce the number
of turns to one or two. I would also
recommend two reverse-connected diodes
across the tuned circuit to absorb any surge from distant lightening strikes
that gets past the low-Z winding. I would
also suggest protecting the input
and output connections to the balun with self-amalgamating tape or at least
vaseline or grease. This would protect them from
corrosion, which could in time
produce a primitive rectifier between
unlike metals at the connection point.
This can generate spurious mixing products and
inter-modulation - which
we definitely don´t want!
Experiment ! If success is not impressive
enough, you might wish
to consider a loop, which could be above the roof
and remote-tuned
from inside, or a ferrite or FSL.
Keep us posted on your progress!
Michael UK
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