[R-390] antennas

[Rasputin Novgorod]

Hi Guys:

My random wire connects via a 9:1 un-balun to 50 ohm coax.
The shield is grounded. Because I had the correct adaptor,
I connected the coax to "Unbalanced" antenna connector on
the R-390A. It works well.

But as I skim the schematics, it appears that the unbalanced
antenna connector goes to the secondary side of the input
preselector(?) CL filters. Does that mean I miss out in the 
first layer of filtering?

The "Balanced" connection goes to the Primary side the 
"preselector". Would I be better off connecting there?
I know some people connect an unbalanced antenna to the left
pin of the "balanced" connector and ground the right pin.

In the good old days, how would the military connect the 
Balanced connector to a dipole? Would they have some 
sort of 125 ohm dual conductor coax? Surely not
ladderline.

Perhaps instead of answering my questions, someone can tell
me what I need to know...

Sincerely,
/blair



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