DAVE,
Understanding the "BroomStick" Antenna and its Coil.
= WHY = Three Shorter Coils may Work Better then One Long Coil.
First: Lets take a Eight Foot (8Ft) piece of One Inch (1") Outside
Diameter (OD) PVC Pipe. (This is our BroomStick Antenna "FORM".)
Second: Take a Single piece of #14 AWG Stranded Insulated Wire
and stretch it out along the length of the PVC Pipe.
What Do We Have? A Vertical Antenna Element - That happens to
be 1/4 of a Wave Length (WL) in the range of 31 MHz.
Third: Take a Single piece of #14 AWG Stranded Insulated Wire
and stretch it out along the length of the PVC Pipe and form a
Coil of 11 Turns (about 1") at the Bottom. What Do We Have?
A "LOADED" Vertical Antenna Element - That happens to act like
1/4 of a Wave Length (WL) in the range of 10 MHz.
Fourth: Take a Single piece of #14 AWG Stranded Insulated Wire
and stretch it out along the length of the PVC Pipe and form a
Coil of 66 Turns (about 6") at the Bottom. What Do We Have?
A "LOADED" Vertical Antenna Element - That happens to act like
1/4 of a Wave Length (WL) in the range of 1 MHz.
Fifth: Take a Single piece of #14 AWG Stranded Insulated Wire
and stretch it out along the length of the PVC Pipe and form a
Coil of 460 Turns (about 2Ft) at the Bottom. What Do We Have?
A "LOADED" Vertical Antenna Element - That happens to act like
1/4 of a Wave Length (WL) for about 100 kHz.
CONCLUSION: The Conclusion That We Must Draw From The Above Is:
That the common BroomStick Antenna that has wire closely wound
on a piece of PVC Pipe to FORM a Coil of 3Ft, 5Ft, or all of
the 8Ft; must be resonant well below 100 kHz.
THEREFO Therefore for 31 MHz, 10 MHz, 1MHz and anything
in-between: The BroomStick Antenna simply looks effectively like
a 1/4 WL Antenna Element that works so-so in the range of 31 MHz.
= = = Effectively like a 1" Copper Pipe.
BETTER: The Better Alternative is to Start over by taking a
Eight Foot (8Ft) piece of One Inch (1") Outside Diameter (OD)
PVC Pipe. (This is our BroomStick Antenna "FORM".)
Next, take a single piece of #14 AWG Stranded Insulated Wire
and wrap three coils on the PVC Pipe.
* "Concerning the BroomStick Antenna" Read Message #410
GoTo=
http://groups.yahoo.com/group/SWL-AM...na/message/410
* "Image of Tri-Band 'BroomStick' Antenna"
GoTo=
http://groups.yahoo.com/group/SWL-AM...na/message/412
PHOTOS Section: Image "BroomStick Antenna Tri-Band"
GoTo=
http://photos.groups.yahoo.com/group...FM-Antenna/lst
iane ~ RHF
..
..
= = = "Dave"
= = = wrote in message ...
"Telamon" wrote in message
...
In article ,
"Dale Parfitt" wrote:
"donutbandit" wrote in message
...
"Dave" wrote in
:
I just got through picking up a ton of discontinued wire from my
local Home Depot, and was planning on building a "broomstick"
antenna like some I found described on the net.
I built one. I was quite disappointed after reading all the hype.
I get better reception from a wire run around the corners of my
bedroom ceiling.
I would not anticipate the broomstick antenna to be any different
than a metal tube or rod of similar dimensions.
Good comparison. A tightly wound broomstick would resemble a
rod for receiving purposes.
--
Telamon
Ventura, California
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Still true, even if each turn of wire is insulated from those
adjacent to it? How could that be?
Thanks,
Dave
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