SWR ratio #'s

E

Ernie Werbel

Guest
Ok I have been learning some more about SWR. At work, I test RF/microwave
components such as couplers, power dividers, terminations, etc. So I deal
with such things as "the VSWR must be less than 1:1.15".

Now, up until recently this has just been looking at numbers on a screen and
saying "pass/fail" but in a course I am currently in, Electronic
Communication Systems, I beleive I am gaining an understanding of this...

If the input impedance is 50 ohms and the maximum deviation ratio on the
output is 1:1.15 for example, that means that the output impedance cannot be
greater than 1.15 * 50 = 57.5 ohms? Does this also apply in the reverse
direction and must be within the range 42.5 to 57.5 as well?

Thanks in advance for any response. Just trying to learn more about a
subject I love
Ernie
 
On Sun, 15 Apr 2007 20:40:47 GMT, "Ernie Werbel" <no@spam.com>
wrote:

Ok I have been learning some more about SWR. At work, I test RF/microwave
components such as couplers, power dividers, terminations, etc. So I deal
with such things as "the VSWR must be less than 1:1.15".

Now, up until recently this has just been looking at numbers on a screen and
saying "pass/fail" but in a course I am currently in, Electronic
Communication Systems, I beleive I am gaining an understanding of this...

If the input impedance is 50 ohms and the maximum deviation ratio on the
output is 1:1.15 for example, that means that the output impedance cannot be
greater than 1.15 * 50 = 57.5 ohms? Does this also apply in the reverse
direction and must be within the range 42.5 to 57.5 as well?

Thanks in advance for any response. Just trying to learn more about a
subject I love
Click to expand...
---
See "Transmission Lines" in:

http://en.wikipedia.org/wiki/Impedance_matching

and:

http://en.wikipedia.org/wiki/Standing_wave_ratio


--
JF
 
This may be of some use to you in understanding SWR.

http://en.wikipedia.org/wiki/Standing_wave_ratio


"Ernie Werbel" <no@spam.com> wrote in message
news:j5wUh.2850$nU4.2272@trnddc03...
Ok I have been learning some more about SWR. At work, I test RF/microwave
components such as couplers, power dividers, terminations, etc. So I deal
with such things as "the VSWR must be less than 1:1.15".

Now, up until recently this has just been looking at numbers on a screen
and
saying "pass/fail" but in a course I am currently in, Electronic
Communication Systems, I beleive I am gaining an understanding of this...

If the input impedance is 50 ohms and the maximum deviation ratio on the
output is 1:1.15 for example, that means that the output impedance cannot
be
greater than 1.15 * 50 = 57.5 ohms? Does this also apply in the reverse
direction and must be within the range 42.5 to 57.5 as well?

Thanks in advance for any response. Just trying to learn more about a
subject I love
Ernie
Click to expand...
 
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