Anyone Know This Chart ....?

[Wire Weasel]

Provide a link to a reputable chart showing Reflected Power vs SWR?

TNX

 

[BJ radionut]

VSWR

Maybe what your looking for...
All the Best
BJ

 

[Captain Kilowatt]

Provide a link to a reputable chart showing Reflected Power vs SWR?

TNX

Did you forget how to use Google??


http://www.profilant.net/pdf/14100100/$File/SWR%20Nomograph1%20ny.pdf!Open



http://www.profilant.net/pdf/14100200/$File/SWR%20Nomograph2%20ny.pdf!Open

 

[Superidgit]

I'm here for you buddy.

CLICK HERE BUDDY

 

[Wire Weasel]

Okay, Now that I have assembled this crack team of intelligent and cheery band of workers, I need more. There's always more isn't there? I should have elaborated further to start with but that would have been too easy.

I need a simple chart that any cow-pie kicking cotton-pickin' CBer can understand to show them that when they say they're seeing 500 watts out of their 2 pill crapbox when they further say that with their 2 pill crapbox on they also have a 2:5 to 1 SWR that much of what they're seeing is a false high reading. That, and their crapbox meter is also inaccurate.

Now get to work

 

[BOOTY MONSTER]

VSWR

Maybe what your looking for...
All the Best
BJ

that #3 chart is what i use BJnut .
according to that chart you have to go to 1.95 vswr to just have a %10 power loss , which the chart says is .45 db of loss ..... or just a hair in 1/2 a db . two questions .....
how accurate is that chart ?
is the amount loss frequency dependent/effected ?

 

[Superidgit]

Not a chart but a calculator. Probably still not what you are looking for.

Voltage Standing Wave Ratio (VSWR) Loss Calculator

 

[BOOTY MONSTER]

I'm here for you buddy.

CLICK HERE BUDDY

how the frick did you do that ?

let me google that for you , sweeet :w00t:

 

[Wire Weasel]

Hey SI the Calculator is pretty cool !

 

[Superidgit]

how the frick did you do that ?

For Mr. Booty!!


Enjoy Mr. Booty!!

 

[BOOTY MONSTER]

For Mr. Booty!!


Enjoy Mr. Booty!!

TY SIR

 

[RatsoW8]

You guys dissapoint me. Not one of you mentioned or posted a link to a Smith chart.

 

[BJ radionut]

"I need a simple chart that any cow-pie kicking cotton-pickin' CBer can understand "

Thats why no Smith Chart...RatsoW8
Sorry WW...could not resist!:w00t:
Sound like one of Mack's answers right?op:
All the Best
BJ

 

[Captain Kilowatt]

Okay, Now that I have assembled this crack team of intelligent and cheery band of workers, I need more. There's always more isn't there? I should have elaborated further to start with but that would have been too easy.

I need a simple chart that any cow-pie kicking cotton-pickin' CBer can understand to show them that when they say they're seeing 500 watts out of their 2 pill crapbox when they further say that with their 2 pill crapbox on they also have a 2:5 to 1 SWR that much of what they're seeing is a false high reading. That, and their crapbox meter is also inaccurate.

Now get to work

The best you are going to be able to do is use the figures from any of the charts linked too and see the ref power for an SWR of 2.5:1. IIRC the meter will show a different power output for a constant SWR of 2.5:1 depending on if the impedance is 125 ohms or if it is 20 ohms. Both values give an SWR of 2.5:1 but a meter will show two different forward power readings.

 

[BJ radionut]

Booty: To answer you...The chart is very accurate IMHO and if you look at the graph CK linked, you find the same relative information...
The only thing I find Frequency dependent is the feed-line(loss) that would add/subtract to the equation.

That's why I never understand the frustration of some operators that will go out of their mind...
OMG! I have a VSWR of 1.6/1...I must be doing something wrong...I simply must get it down to Flat 1/1....WHY?

My experience case in point....My "Backfire" array...
2 dipoles/ 126ft. either side of center point/58ft spacing between dipoles/feed-line 450 ohm ladder line....
This antenna "might" be resonant at 3.5Mhz.
Yet at 3.8 MHz without a tuner the VSWR is somewhere around :"maybe 5-10/1" ??
Yet I would stack this antenna against any resonant coax feed dipole at same height...and stomp it into the dirt!
Also as I increase frequency it will improve over a tuned coax feed dipole at say 7-30 MHz (at the same height)...
Look at the information on the EDZ(ext Double Zepp) at frequencies higher than the intended fundemental...again personal experience in the field MHO...
Just the ramblings of an Old Fat/30+ year Hamy...Ya'know the ones some hear don't like>>>
All the Best
BJ