JAY,
This is why a Receive ONLY Shortwave Listeners (SWL) Antenna
one that is Omni-Directional generally works better then one
that is intended to be directional.
* The SWL Version of the Inverted "L" Antenna works well as
an Omni-Directional Antenna. The SWL Inverted "L" Antenna
usually has a Vertical 'Leg' that is 1/3 to 1/2 the Length of
the Length of Horizontal 'Arm'. Plus the SWL Inverted "L"
Antenna usually is lower to the Ground. This closeness to the
Surface of the Ground results in the SWL Inverted "L" Antenna
being a form of "Near Vertical Incident Skywave" {NVIS} Antenna.
NVIS=
http://www.qsl.net/k5eph/nvis.htm
* These SWL Versions of the Inverted "L" Antennas can be any
size because they are in-fact simply Random Wire Antennas that
are designed to fit the available space.
http://groups.yahoo.com/group/Shortw...nna/message/54
* The Inverted "L" Antenna 'Shape' lends itself to the Design
Concepts of a "Low Noise Antenna" that has been popularized
by John Doty; consisting of: Antenna Element; Matching Transformer;
Grounding Point; Coax Cable Feed-in-Line; Radio/Receiver.
DOTY=
http://www.anarc.org/naswa/badx/ante...e_antenna.html
http://groups.yahoo.com/group/Shortw...enna/message/2
http://groups.yahoo.com/group/Shortw...na/message/374
- Two Reasons to use a Balun (Matching Transformer)
with a Receive Only Antenna.
DOTY=
http://www.anarc.org/naswa/badx/ante..._longwire.html
http://groups.yahoo.com/group/Shortw...na/message/150
- Magnetic Longwire Balun (MLB) - Build Your Own "DIY"
http://groups.yahoo.com/group/Shortw...na/message/177
http://groups.yahoo.com/group/Shortw...na/message/466
http://groups.yahoo.com/group/Shortw...na/message/467
- Balun Reading List ( Long )
http://groups.yahoo.com/group/Shortw...na/message/337
- The "Grounding-Point" = Ground Rods and Ground Wires ETC.
DOTY=
http://www.anarc.org/naswa/badx/antennas/grounding.html
http://groups.yahoo.com/group/Shortw...na/message/425
http://www.hard-core-dx.com/nordicdx/antenna/ground/
http://groups.yahoo.com/group/Shortw...na/message/470
http://groups.yahoo.com/group/Shortw...na/message/539
For those who want a 'Set of Numbers' to Build their SWL Inverted
"L" Antenna here are a few 'Sets of Numbers' to consider for your
available space:
- 10Ft High Vertical 'Leg' with a 20-30Ft Horazontal Arm
having a Total Lenght of 30-40 Feet. Also: 20x40-60 & 30x60-90
- 15Ft High Vertical 'Leg' with a 30-45Ft Horazontal Arm
having a Total Lenght of 45-60 Feet.
- 25Ft High Vertical 'Leg' with a 50-75Ft Horazontal Arm
having a Total Lenght of 75-100 Feet.
- 35Ft High Vertical 'Leg' with a 70-105Ft Horazontal Arm
having a Total Lenght of 105-140 Feet.
NOTE: The Amateur/HAM Inverted "L" Antenna is usually made-up
of Two Equal Sections One Vertical 'Leg' and One Horazontal 'Arm'.
These Two Equal Section can be:
* 1/8th Wavelength = Quarter Wavelength Total
* 1/4th Wavelength = Half Wavelength Total
* 1/2th Wavelength = One Wavelength Total
Because of the 'equal' porportionality, the Amateur/HAM
Inverted "L" Antenna is most often Higher above the Ground
then the SWL Version.
Dr. Ace's [WH2T] Inverted L Antenna Info
ACR=
http://www.bloomington.in.us/~wh2t/invertedl.html
http://groups.yahoo.com/group/Shortw...na/message/309
iane ~ RHF
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= = = Jay Heyl wrote in message
= = = ...
In article ,
says...
Sorry my questions caused you so much anger. I was asking if anyone could
tell me about what is going on at the VOA and if anyone could report on any
signals they might still be able to receive for VOA. They seemed like
reasonable questions for this forum.
I regularly get strong VOA signals intended for Africa at lunch time
here on the west coast. I've never taken the time to try to figure out
where they're coming from. These broadcasts are mostly African futbol
scores and discussions, along with the occasional human interest story
and American pop song. The only time I listen is if BBC or R.
Netherlands aren't coming in that day.
-- Jay
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