Re: Reception on Grundig G3 NOT Amazingly Improved with new 80 Ft Longwire Antenna

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

----- Original Message -----
Sent: 10 July 2011 14:43
Subject: Re: [ultralightdx] Re: Reception on Grundig G3 NOT Amazingly Improved with new 80 Ft Longwire Antenna

>  see

Just a note:
The circuit shown in fig 2B is incorrect. I think he meant the parallel circuit to be in series with the antenna lead, not in shunt configuration as shown.

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