Build a rotatable loop and you can null out some noise and increase
reception.
hank wd5jfr
"Robert11" wrote in message
...
Hello:
Will probably try a coax feed, and a Balun, to the random length wire
running around the four sides of
my attic to reduce noise, hopefully. Do listening only, up to 30 MHz.
a. For a receiving 9:1 Balun (coax to a random length wire in attic),
does the Balun have to be grounded ?
Or, is it grounded "adequately" via the coax - to the radio chassis -
to an earth ground from the radio chassis ?
[If the Balun Does require a ground (also), wouldn't this possibly
cause a ground loop in that it would be grounded at both ends ?]
b. Anyone have any experience with, or opinions on:
-the 9:1 Balun by RF Systems in the Netherlands
(termed a magnetic balun, how it's different from a normal toroidal
transformer coupling, I have no idea ?)
-or the unit by Win Radio (WiNRADiO WR-LWA-0130 Long Wire Antenna Adapter
$39.95 ADP35)
c. Any significant difference in the type of coax used for listening
only,
with a run of about 50 feet.
Used LMR 400 for my attic scanner, but would like to avoid the hassle
of stringing the large diameter coax again, and possibly
just use a small diameter coax. Would one likely notice any
difference
up to 30 MHz ?
Thanks,
Bob
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