Electrical length
 

what is the electrical length of a transmission line in degree?

regards

On 4 Jul 2005 11:09:25 -0700, "redhat" wrote:

what is the electrical length of a transmission line in degree?

regards


Electrical Length in degrees = 360 degrees for each wavelength divided
by the velocity factor.
Bob, W9DMK, Dahlgren, VA
Replace "nobody" with my callsign for e-mail
http://www.qsl.net/w9dmk
http://zaffora/f2o.org/W9DMK/W9dmk.html

0.366L(feet)F(MHz)
L(degrees) = -------------------
VF


--or--
1.20L(meters)F(MHz)
L(degrees) = ---------------------
VF

John
"redhat" wrote in message
oups.com...
what is the electrical length of a transmission line in degree?

regards

what is the electrical length of a transmission line in degree?

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

It depends on frequency, its physical length and on its propagation
velocity.

Velocity Factor (VF) = Actual velocity on line / Velocity of light.

It is sometimes better to refer to length in wavelengths rather than
degrees.

One wavelength = 360 degrees. 1/4-wave line length = 90 degrees.

I'll leave somebody else to write down the actual formula for the
number of degrees in a given length of line in metres, at a given
frequency in MHz and given VF. I'm too tired.
----
Reg.

Reg Edwards wrote:
I'm too tired.

Me too, Reg, too much vino. :-)
--
73, Cecil http://www.qsl.net/w5dxp

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Cecil:

I am growing rather suspicious of you here, we seem to only hear from
you when the wine glass (wine bottle?) is empty! grin

It does bypass the argument over if half-full or half-empty, which is
of a great practical assistance! innocent look

.... and more wine has always fixed most of my perceived problems.
Well, at least it has worked as an immediate fix--not long term
however.

John

"Cecil Moore" wrote in message
...
Reg Edwards wrote:
I'm too tired.

Me too, Reg, too much vino. :-)
--
73, Cecil http://www.qsl.net/w5dxp

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News==----
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At 11 o'clock in the freakin' morning?

Jim


"Cecil Moore" wrote in message
...
Reg Edwards wrote:
I'm too tired.

Me too, Reg, too much vino. :-)
=----

Jim:

Yeah. Cecil is getting old, you can tell, most of us got a jump on
that late hour.

In California we are given a two hour head start (by PST) just to keep
up with those texans! stiff-upper-lip

However, we don't pop the top on the bottle of viagra till 5 p.m.,
before that just isn't considered civilized!
blue-tint-to-facial-features

John

"RST Engineering" wrote in message
...
At 11 o'clock in the freakin' morning?

Jim


"Cecil Moore" wrote in message
...
Reg Edwards wrote:
I'm too tired.

Me too, Reg, too much vino. :-)
=----

In terms that (here)can be understood-- Acting like a HI-"Q"
Circuit-- (Hell of a Capacity, and Damn little Resistance)!

Have fun! Jim NN7K



Cecil Moore wrote to Reg Edwards:

I'm too tired.


Me too, Reg, too much vino. :-)

How long is a piece of string?

"redhat" wrote in message
oups.com...
what is the electrical length of a transmission line in degree?

regards

Fred:

"How much string was on ball of string at the beginning" --MINUS--
"How much string is on the ball when you have cut the string off you
need" = L(length of string)

gessh! amateurs really should know that formula!
tongue-in-cheek

I just hate having to unwind the ball, measure the string, then do it
again after cutting!

John

"Fred W4JLE" wrote in message
...
How long is a piece of string?

"redhat" wrote in message
oups.com...
what is the electrical length of a transmission line in degree?

regards

Fred:

I should have pointed out: It is easier and quicker to work with small
balls, than large balls--of string.

The women seem especially good when it comes to this, I am studying
them closely to see why. dirty-old-man-type-grin

John

"Fred W4JLE" wrote in message
...
How long is a piece of string?

"redhat" wrote in message
oups.com...
what is the electrical length of a transmission line in degree?

regards

The correct answer is "No, How Long is a Chinaman"

"John Smith" wrote in message
...
Fred:

"How much string was on ball of string at the beginning" --MINUS--
"How much string is on the ball when you have cut the string off you
need" = L(length of string)

gessh! amateurs really should know that formula!
tongue-in-cheek

I just hate having to unwind the ball, measure the string, then do it
again after cutting!

John

"Fred W4JLE" wrote in message
...
How long is a piece of string?

"redhat" wrote in message
oups.com...
what is the electrical length of a transmission line in degree?

regards

On Mon, 4 Jul 2005 22:15:24 -0400, "Fred W4JLE"
wrote:

The correct answer is "No, How Long is a Chinaman"

Yes, his is.

Take the line outside at night where you can hear crickets chirp.
Count the number of times it chirps in 15 seconds, and add 40.
Thats the degrees. (temperature).
http://www.srh.noaa.gov/elp/wxcalc/f...cketChirp.html
Now measure the transmission line,
Then get a copy of the ARRL Antenna Handbook
or the ARRL Amateur Radio handbook,
and find out why you asked the wrong question.


"redhat" wrote in message
oups.com...
what is the electrical length of a transmission line in degree?

regards

"Hal Rosser" wrote in message
.. .
Take the line outside at night where you can hear crickets chirp.
Count the number of times it chirps in 15 seconds, and add 40.
Thats the degrees. (temperature).
http://www.srh.noaa.gov/elp/wxcalc/f...cketChirp.html

Ummmm..... You have to specify the species of cricket. Each species has a
characteristic chirp factor.
Also are your degrees F, C or K?

Ummmm..... You have to specify the species of cricket. Each species has a
characteristic chirp factor.
Also are your degrees F, C or K?


This is from
http://www.noblenet.org/reference/crickets.htm

The formula for this is to count the number of chirps in 15 seconds and add
39 to calculate the temperature (degrees Farenheit.) If there are 30 chirps
in 15 seconds, the temperature should be about 69 degrees F. This formula is
said to be accurate within one degree. A variation is to count the chirps in
13 seconds, and add 40.
Sources:
"Cricket thermometers," Field & Stream, July 1993, Vol. 98 Issue 3, p21.



and from http://www.almanac.com/outdoors/crickets.php

we have this:

To convert cricket chirps to degrees Fahrenheit, count number of chirps in
14 seconds then add 40 to get temperature.
Example: 30 chirps + 40 = 70° F

To convert cricket chirps to degrees Celsius, count number of chirps in 25
seconds, divide by 3, then add 4 to get temperature.
Example: 48 chirps /(divided by) 3 + 4 = 20° C

===========

there's apparently a small descrepancy (1 degree) in the sources.

Yah
That's why I use a thermometer -
- or - make Arnold count the chirps for me.
He's a real chirpinator



"Arnold Schwarzenegger" wrote in message
news:ir7wmcjgcvulegj.050720052100@kirk...
only girly men count cricket chirps

arnold

We need you to prove you are who you say you are, so please answer these
questions:
1. Do you know who your daddy is ?
2. If so, can you spell his last name ?
3. How many Floridians does it take to cast one Republican vote?
4. Do you have anything against Republican crickets?

"George Washington Bush" wrote in message
news:4qmkdpfrb723j7u.060720051413@kirk...
Hal;

Now don't be picking on my good buddy arnie, he is doing a fine job
out there in california for me.

We need him to get those drivers licenses for the illegal aliens. By
this time next year I would like to have all the truck drivers which
are buying homes, cars and sending their children through college
reduced to receiving welfare checks.

It doesn't take a genius to drive a truck and that is one of the last
areas a working fellow can still earn a half decent living, time for
those illegals to start driving those big rigs for a minimum wage.

With those illegals living 10 family's to a home they can get by on a
lot less.

Get with the plan man. We used to export our standard of living to the
rest of the world pulling them out from under poverty, disease and
death, but that got darn tiring (and our profits from ripping them off
under that system were too low.) We replaced that tired old plan with
the new one, 'import 3'rd world conditions to america.' Now get out
there, support your president, your congress and the supreme court and
employ an illegal alien today.

I am counting on you to be a team player here hal.

Now put down those silly crickets and the thermometer and get to work
man!

G.W.B.

"Hal Rosser" wrote in message
.. .
Yah
That's why I use a thermometer -
- or - make Arnold count the chirps for me.
He's a real chirpinator



"Arnold Schwarzenegger" wrote in message
news:ir7wmcjgcvulegj.050720052100@kirk...
only girly men count cricket chirps

arnold

Hal Rosser wrote:
We need you to prove you are who you say you are, so please answer these
questions:
1. Do you know who your daddy is ? ... Abraham Lincoln
2. If so, can you spell his last name ? ... Penny [One Cent]
3. How many Floridians does it take to cast one Republican vote? ... Ain't enough
4. Do you have anything against Republican crickets? ... Only if they don't vote!

I just love these defining moments ....