= = = "HankG" no_one@invalid wrote in message
= = = ...
My primary antenna is a 33 ft folded dipole made from 300 ohm twin lead and
is mounted in my roof. It is coupled by a 300 to 75 ohm tv transformer to
75 ohm coax. The antenna is described in message 2471 of the Yahoo Rx-320
group and works fairly well.

Recently, I acquired 3 rolls (40 ft each) of indoor 300 ohm coax, a closeout
at Radio Shack. On checking my house diagram (drawing), I determined that I
could run another antenna which could run about 100 feet if I include my
garage. This is measured from left rear roof, through a wall, diagonally to
front right garage (plus a 20 ft wrap on each end).

I'd welcome any suggestions from the group on an antenna configuration such
as dipole, folded dipole, twinlead converted to long wire (doubled back on
itself), etc. This would be for SW reception, but MW would be a plus.
Thanks.

HankG


HankG,

If you wish to work with what you have then an In-the-Attic Horizontal
{Flat} 'double' Loop Antenna using the 300 Ohm Twin Lead would most
likely give you a good SWL "Receive Only" Antenna with broad banded
reception with low noise characteristics.

HOW-TO-DO-IT: In-the-Attic Horizontal {Flat} 'double' Loop
Antenna using the 300 Ohm Twin Lead as the Antenna Wire Elements.

Take your three rolls of Forty Foot (40') 300 Ohm Twin Lead and
connect
them End-to-End and Wire-to-Wire to form a piece of 120 Foot Twin
Lead.
(Any length of 300 Ohm Twin Lead will do; the longer the better.)

* Antenna Wire Element.
Inspect and Evaluate your Attic (or Roof) to determine how you plan to
to 'place' (run/route) the Antenna Wire Element of the Horizontal
{Flat}
Loop Antenna.
- Ideally this is at a Height of 5'-7' above the Attic Floor.
- The Loop need not be Square or a Rectangle and can be any shape
that
"Fits" the 'conture' of your Attic.
- You can use Bent-Nails, Eye Bolds or Cup-Hooks as Anchor-Mounting
Points for the Antenna Wire Element. (Tape them with Black Electrical
Tape if you wish.)
- You have Four Wire coming out of the two ends of the 120 Foot
Antenna
Wire Element (two loops). Connect two of the Wire-Ends so that you
now
have a Double Loop that is 240 Feet Long. The two free Wire-Ends are
to
connect to your Balun (Matching Transformer).
NOTE: The Loop can be a 30' Square; a 10'/15'/20'/25' by
50'/45'/40'/35'
Rectangle or any shape that adds up to 120' overall.
FWIW: The Loop Size can be Down-Sized or Up-Sized to "Fit" your
'available'
Attic Space.

* Balun (Matching Transformer) and Coax Cable.
- Buy and use a TV type 300 Ohm to 75 Ohm Balun (Matching
Transformer).
(Look for one that states on the package that it is good down to 5
MHz.
Along with 75 Ohm Coax Cable. (I would recommend DDS type RG-6 Coax
Cable
with the attached Ground Wire.)
- OR - Buy or Build a SWL 4:1 (up to 10:1) Balun (Matching
Transformer)
to used with 50 Ohm Coax Cable. (I would recommend RG-8 'Mini' Coax
Cable.)
- Connect the two free Wire-Ends are to connect to your Balun
(Matching
Transformer).

* Grounding.
Insure that you have a good earthen ground using a Eight Foot (8')
Ground
Rod and Heavy Duty Ground Wire/Strap for you Shack's Radio Equipment
and
Antenna.

RESULTS: You now have a Horizontal {Flat} Loop Antenna that is 120
Feet
long with a 'double' Loop Wire Antenna Element that is 240 Feet long.
That uses a Balun to connect and match it to the Coax Cable
Feed-in-Line;
plus a Ground for your Radio Equipment and Antenna.
+ Lower Noise Horizontal {Flat} Loop Antenna.
+ Lower Noise Balun and Coax Cable Feed-in-Line.
+ Ground Rod and Wire for Lower Noise.

Connect the Ground and Antenna to your Radio/Receiver and Enjoy
Broadcast
and Shortwave Listening ) ) ) ) ) ) ) ) ) ) )
)


iane ~ RHF
..
Some Say: On A Clear Day You Can See Forever.
http://groups.yahoo.com/group/Shortw...na/message/502
I BELIEVE: On A Clear Night . . .
You Can Hear Forever and Beyond, The BEYOND !
..
..