In article , rhf-say-
says...
Telamon,

One of the more 'exciting' stories concerning the BroomStick
Antenna in the Middle East. This Guy built a 18Ft Long/Tall
BroomStick on 4" PVC Pipe. Plus, he had a 750 Ft Random Wire
Antenna connected to the Top of the BroomStick Antenna !

Hello - He had a 750 Longwire Antenna [.]

I've seen you mention this before, but, as I recall the story, the 750
foot longwire was an existing antenna. One would assume the guy knew
how the existing longwire performed and would not be raving about the
broomstick if the performance were not significantly better than that of
the longwire alone.

Admittedly, the whole annecdote needs significantly more information to
be able to draw any kind of legitimate conclusion about the longwire or
either of the broomsticks. And it would have been nice if he'd used a
bit more scientific method and a lot less "kitchen sink" in his approach
to antenna evaluation. But, barring further evidence, I don't think it's
valid to completely discount the broomstick by assuming the longwire was
doing all the work.

I'm not saying the broomstick is a wonder antenna, just that there is no
clear evidence in this annecdote to shoot it down.

-- Jay

Jay Heyl wrote:

In article , rhf-say-
says...
Telamon,

One of the more 'exciting' stories concerning the BroomStick
Antenna in the Middle East. This Guy built a 18Ft Long/Tall
BroomStick on 4" PVC Pipe. Plus, he had a 750 Ft Random Wire
Antenna connected to the Top of the BroomStick Antenna !

Hello - He had a 750 Longwire Antenna [.]

I've seen you mention this before, but, as I recall the story, the 750
foot longwire was an existing antenna. One would assume the guy knew
how the existing longwire performed and would not be raving about the
broomstick if the performance were not significantly better than that of
the longwire alone.

Admittedly, the whole annecdote needs significantly more information to
be able to draw any kind of legitimate conclusion about the longwire or
either of the broomsticks. And it would have been nice if he'd used a
bit more scientific method and a lot less "kitchen sink" in his approach
to antenna evaluation. But, barring further evidence, I don't think it's
valid to completely discount the broomstick by assuming the longwire was
doing all the work.

I'm not saying the broomstick is a wonder antenna, just that there is no
clear evidence in this annecdote to shoot it down.

-- Jay

He made a base loaded long wire.


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= = = longwave wrote in message
= = = ...

- - - - - S N I P - - - - -

He made a base loaded long wire.

- - - - - S N I P - - - - -

LW,

Not really, the 18 Foot tall PVC Pipe 'wire wound' Broomstick
Antenna at these Shortwave HF would efectively appear to be a
[Hollow] Metal Tube acting as a vertical antenna element.
( A piece of Copper Pipe. )

The better arangement would be to take a piece of PVC Pipe with
a "T" on Top. Start with a piece of wire, and have a single
loading coil wound for a specific frequency; and then run the
wire up to the "T" and through it and out horizontally for as
many feet as you can run the wire.

Indoors - Stick the PVC Pipe in the corner of a room and have
the top wire circle the room at near the ceiling level.

Simply - A Folded Inverted "L" Antenna with a Loading Coil
designed for a single target Shortwave Band.

If this is then your thing - The 'build' a series of them
if you need coverage on more bands.

iane ~ RHF

..

longwave wrote in message ...

He made a base loaded long wire.

And this means what, exactly? That the 6m pipe with 1200m of wire did
nothing but provide a better impedance match between the radio and the
existing longwire?

Question:
How does one make a loading coil for a specific frequency;

- &
Has anyone made SEVERAL loading coils, switching between them
( all hooked to a long wire)
for better reception on different frequencies

- What works WORKS !!

Dan / NYC


In article ,
(Patchmaster) writes:


He made a base loaded long wire.

And this means what, exactly? That the 6m pipe with 1200m of wire did
nothing but provide a better impedance match between the radio and the
existing longwire?

(Diverd4777) wrote in message ...
Question:
How does one make a loading coil for a specific frequency;

You usually use inductive loading to tune a shorter than 1/4 wave
radiator to an electrical 1/4 wave. The amount of inductance needed
will vary as to what freq you want to tune to, and the size of the
radiator. My mobile antenna uses a loading coil. A broomstick, if it
is what I think you mean, is a helical antenna, and is continuously
loaded along it's whole length.

- &
Has anyone made SEVERAL loading coils, switching between them
( all hooked to a long wire)
for better reception on different frequencies

It's much simpler to use one coil, and tap it for the freq to be used.
IE:
My mobile antenna uses a homebrew loading coil "3 inches diameter and
maybe 10-12 inches long" that will tune my 10 ft tall center loaded
whip down to 80m. "3.5-4.0 mhz" But it also has a tap for each of the
higher bands all the way up to 10m. It works all bands 80-10 with one
coil. I just change the jumper from the base of the coil, to whatever
tap I want. I do have to change to shorter stinger whips 12m up, as
my antenna is then full size, and the coil is bypassed by the jumper.
An outbacker mobile antenna is an example of a helical whip which is
tapped for different bands with a banana plug jumper at different
points along the whip.

- What works WORKS !!

It works. MK