"Slotted" Line
 

I vaguely remember building a coaxial "slotted" line without
the slot when I was in college. We took a piece of coax,
stripped off about a foot or so of outside insulation, and
ran an insulated wire under the braid. We tied one end to
ground through a R=Z0 resistor and ran the other end
to a 1N34 rectifier. Anybody remember running a wire
under the braid to achieve an inductive pickup for
forward and reflected power?
--
73, Cecil, http://www.qsl.net/w5dxp


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Cecil:

Yes. That works alright!
I just like to construct them from two different diameters of copper tubing
"outer I.D./Inner O.D. = ~50 Ohms" and, you know why don't ya?

It looks "kewler" when I show it to my "CB Buddies!!!" That tubing is as
bright and shinny as a new penny!!! (pennies are only copper coated zinc
these days, yanno--kinda like "time", NOT real) innocent-look

I didn't used to do that, picked that bad habit up from RICHARD!!! grin

Warmest regards,
John

"Cecil Moore" wrote in message
...
|I vaguely remember building a coaxial "slotted" line without
| the slot when I was in college. We took a piece of coax,
| stripped off about a foot or so of outside insulation, and
| ran an insulated wire under the braid. We tied one end to
| ground through a R=Z0 resistor and ran the other end
| to a 1N34 rectifier. Anybody remember running a wire
| under the braid to achieve an inductive pickup for
| forward and reflected power?
| --
| 73, Cecil, http://www.qsl.net/w5dxp
|
|
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On Thu, 05 May 2005 14:01:05 -0500, Cecil Moore wrote:
I vaguely remember building a coaxial "slotted" line without
the slot when I was in college. We took a piece of coax,
stripped off about a foot or so of outside insulation, and
ran an insulated wire under the braid. We tied one end to
ground through a R=Z0 resistor and ran the other end
to a 1N34 rectifier. Anybody remember running a wire
under the braid to achieve an inductive pickup for
forward and reflected power?

That's really a directional coupler, not a slotted line (but you
already knew that). I vaguely recall seeing it in QST or a Handbook
back in the 1950s.

Bob, N7XY

That technique was used by every SWR meter I ever looked inside of. I
assume the Bruene circuit is used more often now, but I'll bet a lot of
cheap SWR meters still use that technique.

Roy Lewallen, W7EL

Bob Nielsen wrote:
On Thu, 05 May 2005 14:01:05 -0500, Cecil Moore wrote:

I vaguely remember building a coaxial "slotted" line without
the slot when I was in college. We took a piece of coax,
stripped off about a foot or so of outside insulation, and
ran an insulated wire under the braid. We tied one end to
ground through a R=Z0 resistor and ran the other end
to a 1N34 rectifier. Anybody remember running a wire
under the braid to achieve an inductive pickup for
forward and reflected power?


That's really a directional coupler, not a slotted line (but you
already knew that). I vaguely recall seeing it in QST or a Handbook
back in the 1950s.

Bob, N7XY

Yep I use that configuration for a directional coupler/VSWR measuring
device some years ago. I ran the internal insulated lines up either side
of the coax (RG213) into a switch box and off to a DVM. I think I used
shottkey diodes.

Cheers Bob VK2YQA

Cecil Moore wrote:
I vaguely remember building a coaxial "slotted" line without
the slot when I was in college. We took a piece of coax,
stripped off about a foot or so of outside insulation, and
ran an insulated wire under the braid. We tied one end to
ground through a R=Z0 resistor and ran the other end
to a 1N34 rectifier. Anybody remember running a wire
under the braid to achieve an inductive pickup for
forward and reflected power?

Doesn't look as if everyone like Bruenes' views...
http://www.w2du.com/BrueneRebuttal.pdf

Warmest regards,
John

"Roy Lewallen" wrote in message
...
| That technique was used by every SWR meter I ever looked inside of. I
| assume the Bruene circuit is used more often now, but I'll bet a lot of
| cheap SWR meters still use that technique.
|
| Roy Lewallen, W7EL
|
| Bob Nielsen wrote:
| On Thu, 05 May 2005 14:01:05 -0500, Cecil Moore wrote:
|
| I vaguely remember building a coaxial "slotted" line without
| the slot when I was in college. We took a piece of coax,
| stripped off about a foot or so of outside insulation, and
| ran an insulated wire under the braid. We tied one end to
| ground through a R=Z0 resistor and ran the other end
| to a 1N34 rectifier. Anybody remember running a wire
| under the braid to achieve an inductive pickup for
| forward and reflected power?
|
|
| That's really a directional coupler, not a slotted line (but you
| already knew that). I vaguely recall seeing it in QST or a Handbook
| back in the 1950s.
|
| Bob, N7XY

Bob:

My diodes are schottky...
My "key" has always been shot....
sorry, couldn't resist... no one make more typos then me... grin

Warmest regards,
John

"Bob Bob" wrote in message
...
| Yep I use that configuration for a directional coupler/VSWR measuring
| device some years ago. I ran the internal insulated lines up either side
| of the coax (RG213) into a switch box and off to a DVM. I think I used
| shottkey diodes.
|
| Cheers Bob VK2YQA
|
| Cecil Moore wrote:
| I vaguely remember building a coaxial "slotted" line without
| the slot when I was in college. We took a piece of coax,
| stripped off about a foot or so of outside insulation, and
| ran an insulated wire under the braid. We tied one end to
| ground through a R=Z0 resistor and ran the other end
| to a 1N34 rectifier. Anybody remember running a wire
| under the braid to achieve an inductive pickup for
| forward and reflected power?

That has nothing to do with his directional coupler circuit.

But at least Bruene is willing to attach his name to his views rather
than hiding behind a pseudonym. That in itself is worthy of a certain
amount of respect.

Roy Lewallen, W7EL

John Smith wrote:
Doesn't look as if everyone like Bruenes' views...
http://www.w2du.com/BrueneRebuttal.pdf

Warmest regards,
John

No, you are quite correct, that paper does not... I didn't mean to infer
that, sorry if that is the way it appeared....

As to "my name", it stands for an ideal... I think that has been
misinterpreted here also... let me clarify:

"John Smith" = "Principles BEFORE personalities!"

Or, "John Smith" = "Anti-Hero Worship"... or, something like that...

I don't think if I wrote a book on that subject that I could find better
words, than "John Smith", to express that ideal... but, I can see some
explaination is necessary...

Warmest regards,
John

"Roy Lewallen" wrote in message
...
| That has nothing to do with his directional coupler circuit.
|
| But at least Bruene is willing to attach his name to his views rather
| than hiding behind a pseudonym. That in itself is worthy of a certain
| amount of respect.
|
| Roy Lewallen, W7EL
|
| John Smith wrote:
| Doesn't look as if everyone like Bruenes' views...
| http://www.w2du.com/BrueneRebuttal.pdf
|
| Warmest regards,
| John

John Smith wrote:
Doesn't look as if everyone like Bruenes' views...
http://www.w2du.com/BrueneRebuttal.pdf

That's not about Bruene's SWR meter circuitry. That
argument is over the internal impedance of a ham
transmitter, a subject I would suggest you avoid
at all costs. :-)
--
73, Cecil http://www.qsl.net/w5dxp

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Roy Lewallen wrote:
But at least Bruene is willing to attach his name to his views rather
than hiding behind a pseudonym. That in itself is worthy of a certain
amount of respect.

I've been wondering if John Smith is kin to Dr. Slick. :-)
--
73, Cecil http://www.qsl.net/w5dxp

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NOW you sound like an old CS professor of mine (I think my mom talked to
him--way back then--put that idea in his head grin)... he attempted to
dissuade me from the field--it failed... and, much to the regret of some of
my ex-superiors....



....now, I live in this steel cell, they shove raw meat though the hole in
the door, I shove my source code out under the door, in exchange--hey, it
works!. evil grin



Warmest regards,

John



"Cecil Moore" wrote in message
...
| John Smith wrote:
| Doesn't look as if everyone like Bruenes' views...
| http://www.w2du.com/BrueneRebuttal.pdf
|
| That's not about Bruene's SWR meter circuitry. That
| argument is over the internal impedance of a ham
| transmitter, a subject I would suggest you avoid
| at all costs. :-)
| --
| 73, Cecil http://www.qsl.net/w5dxp
|
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But then, in a way, it does have to do with his circuit being for only ONE
input impedance!

Warmest regards,
John

"Roy Lewallen" wrote in message
...
| That has nothing to do with his directional coupler circuit.
|
| But at least Bruene is willing to attach his name to his views rather
| than hiding behind a pseudonym. That in itself is worthy of a certain
| amount of respect.
|
| Roy Lewallen, W7EL
|
| John Smith wrote:
| Doesn't look as if everyone like Bruenes' views...
| http://www.w2du.com/BrueneRebuttal.pdf
|
| Warmest regards,
| John

Ahhhh, ... ye of little faith... don't believe in "God" either... grin

Warmest regards,
John

"Cecil Moore" wrote in message
...
| John Smith wrote:
| Doesn't look as if everyone like Bruenes' views...
| http://www.w2du.com/BrueneRebuttal.pdf
|
| That's not about Bruene's SWR meter circuitry. That
| argument is over the internal impedance of a ham
| transmitter, a subject I would suggest you avoid
| at all costs. :-)
| --
| 73, Cecil http://www.qsl.net/w5dxp
|
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How transmission lines work was completely and fairly simply sorted
out by Oliver Heaviside around 1875.

There's nothing complicated about it except what old-wives with
so-called SWR meters try to make of it.
----
Reg, G4FGQ

====================================
I vaguely recall seeing it in QST or a Handbook
back in the 1950s.

Well, since losing the one, don't have a wife here--don't want another
one--seeing the girlfriend now and then is quite enough... besides, they
don't make 'em as cute as they used to! frown

So, I got to do EVERYTHING for myself--include making up the wivestales!
(really takes a females'-touch I am finding) ...and I kinda miss 'em...
frown

Warmest regards,
John

"Reg Edwards" wrote in message
...
| How transmission lines work was completely and fairly simply sorted
| out by Oliver Heaviside around 1875.
|
| There's nothing complicated about it except what old-wives with
| so-called SWR meters try to make of it.
| ----
| Reg, G4FGQ
|
| ====================================
| I vaguely recall seeing it in QST or a Handbook
| back in the 1950s.
|
|
|

Cecil Moore wrote:
Roy Lewallen wrote:

But at least Bruene is willing to attach his name to his views rather
than hiding behind a pseudonym. That in itself is worthy of a certain
amount of respect.


I've been wondering if John Smith is kin to Dr. Slick. :-)

No, Dr. Slick is the new name for Tony Blair who was just
re-elected by the British people, some of whom made fun of
us for re-electing George Bush.
73,
Tom Donaly, KA6RUH

Yeh-- Except that you need 2 WIRES! (unless both lengths to the coax
connector are the same length, from where "the wire" is at! to keep
the directional coupler at the same physical place(s) when makeing
measurements) As power is induced at one end of the coax, it can be
sensed , the opposite direction, by the sampling line- basis for an
SWR bridge-- Also works at microwave, with slot in waveguide to another
attached waveguide section- one end sealed (these are indeed called a
"directional coupler" ) Jim NN7K

Cecil Moore wrote:
I vaguely remember building a coaxial "slotted" line without
the slot when I was in college. We took a piece of coax,
stripped off about a foot or so of outside insulation, and
ran an insulated wire under the braid. We tied one end to
ground through a R=Z0 resistor and ran the other end
to a 1N34 rectifier. Anybody remember running a wire
under the braid to achieve an inductive pickup for
forward and reflected power?

Tom Donaly wrote:

Cecil Moore wrote:

Roy Lewallen wrote:

But at least Bruene is willing to attach his name to his views rather
than hiding behind a pseudonym. That in itself is worthy of a certain
amount of respect.



I've been wondering if John Smith is kin to Dr. Slick. :-)


No, Dr. Slick is the new name for Tony Blair who was just
re-elected by the British people, some of whom made fun of
us for re-electing George Bush.

Probably won't be salad days for him tho'. His party took a big hit,
and the way British politics work, that may cost him his job.

- Mike KB3EIA -

Jim - NN7K wrote:
Yeh-- Except that you need 2 WIRES!

Not if all you want to do is minimize SWR. Sampling the
reflected wave with one wire and driving an LED through
an op-amp will indicate when reflected power is minimum.
--
73, Cecil http://www.qsl.net/w5dxp


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Mike Coslo wrote:
His party took a big hit,
and the way British politics work, that may cost him his job.

Before or after New Years Day?
--
73, Cecil http://www.qsl.net/w5dxp


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