slinky beverage
 

the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?

http://www.metaltoys.com/Slinky.htm

In article ,
"the captain" wrote:

the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting
table ?

http://www.metaltoys.com/Slinky.htm


It won't work as a Beverage. The trick to a Beverage is that the TEM mode
trapped on the wire moves at the same speed as the incoming waves, so even
the weak longitudinal coupling due to ground absorption builds up. The
wave on the wire stays in phase with a signal coming from the direction
the wire is pointed.

A Slinky is a "slow wave" structu the speed of the trapped mode is much
less than the vacuum speed of light. The phase relationship that makes a
Beverage work won't hold.

--
| John Doty "You can't confuse me, that's my job."
| Home:
| Work:

the captain wrote:

the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?

What's wrong with wire?



http://www.metaltoys.com/Slinky.htm

the captain sails new and unexplored waters, most people already use
wire. it's time for new adventures.




N8KDV wrote:

the captain wrote:


the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?


What's wrong with wire?



http://www.metaltoys.com/Slinky.htm

the captain wrote:

the captain sails new and unexplored waters, most people already use
wire. it's time for new adventures.

Well if you intend to make a Beverage antenna with slinkys you'd better be
prepared to buy a bunch of em.



N8KDV wrote:

the captain wrote:


the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?


What's wrong with wire?



http://www.metaltoys.com/Slinky.htm

aye, that's the ticket. at 80 feet each I better fetch 25 of the
puppies. 4000 feet, now that be an antenna !



N8KDV wrote:

the captain wrote:


the captain sails new and unexplored waters, most people already use
wire. it's time for new adventures.


Well if you intend to make a Beverage antenna with slinkys you'd better be
prepared to buy a bunch of em.



N8KDV wrote:

the captain wrote:



the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?


What's wrong with wire?



http://www.metaltoys.com/Slinky.htm

N8KDV wrote in message ...
the captain wrote:

the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?

What's wrong with wire?


It's All in a Name - The SLINKY is a "Metal Toy"



http://www.metaltoys.com/Slinky.htm

On Thu, 14 Aug 2003 16:10:57 GMT, the captain wrote:

the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table ?

http://www.metaltoys.com/Slinky.htm


Let me know how well it works, Ill post the results on my Slinky page.


==========
"Being diabetic is alot like having an un-invited
guest at a picnic, who keeps pointing out the potato
salad may have gone bad."--W.B. Willis

"Destiny has a strange sense of humor..." K. Honeycutt
----------
http://www.geocities.com/swl_yb400pe
http://www.geocities.com/swl_yb400pe/psychedelic.htm
http://www.geocities.com/swl_yb400pe/slinkypage.html

"He not busy being born is busy dying..." B. Dylan


=======================

Behold, the captain signaled from keyed 4-1000A filament:

the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting
table ?

http://www.metaltoys.com/Slinky.htm

I had one - worked awesome!

Get the electrolytic coated ones - they won't rust.

--
Gregg
*Perhaps it's useful, even if it can't be SPICE'd*
Visit the GeeK Zone - http://geek.scorpiorising.ca

Though not a beverage, I ran 500 feet of longwire when I lived in a rural
area and it made for excellant reception on the mediumwave AM band. I used
an Icom 735. I pulled in the carribean some from Maine, and stations in
middle America...stuff I could not do without the 500 foot wire. It seems
the longer the better for mediumwave as it picks up the ground wave signal.
the captain wrote in message
...
the captain is thinking about a slinky beverage using the super slinky
at this web site. any suggestions before I plop down at the drafting table
?

http://www.metaltoys.com/Slinky.htm

On Thu, 14 Aug 2003 20:32:24 GMT, the captain
wrote:

the captain sails new and unexplored waters, most people already use
wire. it's time for new adventures.

The "captain" has no idea what he's doing. This ain't no beverage
you're making. I'm not saying you won't hear some interesting things
with it, but it won't have the properties a real Beverage with plain
wire would have.

73,


Jake Brodsky, AB3A
"Beware of the massive impossible!"

"the captain" wrote in message
...
hey bud, "ain't" is not proper english. there could be children learning
english from this thread

the big C




Ain't's almost OK with the good folk at dictionary.com:

"Even educated and upper-class speakers see no substitute in folksy
expressions such as Say it ain't so and You ain't seen nothin' yet."

http://dictionary.reference.com/search?q=ain%27t

Too bad the online version of the OED is a subscription service. I'm sure
they'd have even more to say about this fine colloquialism.

Frank Dresser

In article bU6"the captain"
@bgtnsc0 4-news.ops.worldnet.att.net,
"the captain" wrote:

would a slinky make a good travel antenna ? take it to the park or
camping and stretch it out? seems like it would be quick to put away and

Well, what I use is a dipole made with a pair of 3 meter lengths of wire
connected to a plug. The wires have alligator clips at the ends, mostly
just as a handy way to string them up, but I also sometimes clip them to
available metal objects. It's not hard to coil up.

The Slinky is fun, but calculations of its performance relative to a
straight wire are discouraging. Below resonance it's just a hunk of wire,
only slightly better than a straight wire of similar length. It's a
relatively efficient antenna at resonance (which for a "standard" slinky
is around 7 MHz), but above resonance it is less efficient than a straight
wire of the same length. For HF reception, efficiency generally matters
most at the higher frequencies where the Slinky's efficiency is in
decline.

--
| John Doty "You can't confuse me, that's my job."
| Home:
| Work:

JD,

"It's a relatively efficient antenna at resonance (which for a
"standard" slinky is around 7 MHz)"

So what would you think the relative 'resonant frequency' of the small
diameter and shorter Slinky Jr. be ? ? ?


~ RHF
..
..
= = = "John Doty"
= = = wrote in message ...
In article bU6"the captain"
@bgtnsc0 4-news.ops.worldnet.att.net,
"the captain" wrote:

would a slinky make a good travel antenna ? take it to the park or
camping and stretch it out? seems like it would be quick to put away and

Well, what I use is a dipole made with a pair of 3 meter lengths of wire
connected to a plug. The wires have alligator clips at the ends, mostly
just as a handy way to string them up, but I also sometimes clip them to
available metal objects. It's not hard to coil up.

The Slinky is fun, but calculations of its performance relative to a
straight wire are discouraging. Below resonance it's just a hunk of wire,
only slightly better than a straight wire of similar length. It's a
relatively efficient antenna at resonance (which for a "standard" slinky
is around 7 MHz), but above resonance it is less efficient than a straight
wire of the same length. For HF reception, efficiency generally matters
most at the higher frequencies where the Slinky's efficiency is in
decline.

In article , starman
wrote:

John Doty wrote:

In article ,
wrote:

So what would you think the relative 'resonant frequency' of the small
diameter and shorter Slinky Jr. be ? ? ?

One of the peculiar things about a small diameter helix is that over a
rather wide range of pitch angles and diameters it resonates at
approximately twice twice the frequency that it would if it were
stretched out straight.

Is there a formula that applies to a Slinky?

Not hard to calculate this with a helix of at least three turns will
result in an impedance of ~ 140 ohms:

Wavelength = WL

Diameter of a turn .35 WL
Circumference of a turn 1.1 WL
Pitch ~ 13.5 deg
Spacing between turns WL tan 13.5 deg (about 1.35 WL)

Seen from the side the helix should look like a sine wave proportional
to the size of an EM wave it is made for in air. From this you can
probably guess how it works.

A typical slinky would work in the microwave range.

I consider the helix to be a basic antenna in that it emulates the way a
wave travels in space. A reference dipole is like space terminated to a
passing wave.

--
Telamon
Ventura, California