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Offline AaaeeE

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swr problem
« on: September 01, 2008, 11:45:31 PM »
gud eve po.... pwd po nyo ba ako 2lungan sa pag.kuha nang swr of yagi-uda antenna using this parameter
and may nakapagsabi kc sakin may software daw para sa swr reading....

Fc = 79mhz
lambda = 3.6 meter

lambda/2 for driven element = 1.8 meter or in feet 5.91 ft.
for reflector element length = 6.496ft
for director element lenght = 5.31ft
spacing from reflector to driven element = 2.126ft
spacing from driven to director1 element = 1.89ft
spacing from director1 to director2 element = 2.126ft
spacing from director2 to director3 element = 2.36ft
"debale po apat ung element ko d pa kasali ung driven element"

salamat po.... wala kc ako device or equipment to read the swr....maintindihan
sana po nyo ako.....




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swr problem
« on: September 01, 2008, 11:45:31 PM »

Offline reianjim

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Re: swr problem
« Reply #1 on: September 07, 2008, 12:27:41 AM »
what a question...

swr = (r+1)/(r-1);

where r is reflection coefficient....
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Re: swr problem
« Reply #1 on: September 07, 2008, 12:27:41 AM »

Offline AaaeeE

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Re: swr problem
« Reply #2 on: September 07, 2008, 03:34:00 PM »
Quote from: reianjim on September 07, 2008, 12:27:41 AM

swr = (r+1)/(r-1);

where r is reflection coefficient....

d kc madali kunin ung reflection coefficient, lalo na pag wla kang equipment or device..

paano ba kunin ung reflection coefficient?



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Re: swr problem
« Reply #2 on: September 07, 2008, 03:34:00 PM »

Offline Shey

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Re: swr problem
« Reply #3 on: September 07, 2008, 03:46:41 PM »
mas madali i-measure mo na lang yung Vmax at Vmin along the transmission line using an analog voltmeter tapos divide mo yan.. Vmax divide by Vmin is SWR..

what you need to do is "run" the voltmeter along the length of your transmission line and measure the maximum and minimum voltage..
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Re: swr problem
« Reply #3 on: September 07, 2008, 03:46:41 PM »

Offline Shey

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Re: swr problem
« Reply #4 on: September 07, 2008, 03:54:49 PM »
Quote from: AaaeeE on September 01, 2008, 11:45:31 PM
gud eve po.... pwd po nyo ba ako 2lungan sa pag.kuha nang swr of yagi-uda antenna using this parameter
and may nakapagsabi kc sakin may software daw para sa swr reading....

Fc = 79mhz
lambda = 3.6 meter

lambda/2 for driven element = 1.8 meter or in feet 5.91 ft.
for reflector element length = 6.496ft
for director element lenght = 5.31ft
spacing from reflector to driven element = 2.126ft
spacing from driven to director1 element = 1.89ft
spacing from director1 to director2 element = 2.126ft
spacing from director2 to director3 element = 2.36ft
"debale po apat ung element ko d pa kasali ung driven element"

salamat po.... wala kc ako device or equipment to read the swr....maintindihan
sana po nyo ako.....


i am not aware of any software that can compute the SWR of Yagi-Uda antenna.. baka naman "Antenna Impedance" ang pinapahanap kasi when you talk about SWR kinconsider natin diyan yung impedance ng transmission line and sa example mo hindi mo naman nilagay yung impedance ng transmission line..
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Alone I look for the way
Hoping you are waiting for me
where the hostile world has no say
that is where I always want to be.
Where my eyes want to follow
When I'm far, far away,
When life brings me sorrow,
Into silence I escape.

Alone I look for the way
hoping you are waiting for me
where the hostile world has no say
that is where I always want to be.
Where my rush of thoughts
in oblivion drowns
to forget the evil lot
I will sleep in safe arms.

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Re: swr problem
« Reply #4 on: September 07, 2008, 03:54:49 PM »

Offline ef - el - ay - pee

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Re: swr problem
« Reply #5 on: September 07, 2008, 06:49:42 PM »
tingnan ko lang yung website ng ansoft designer....kasi yun yung gamit kong pangsimulate ng transmission lines ko eh...
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Offline gie62

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Re: swr problem
« Reply #6 on: September 07, 2008, 07:14:52 PM »
manghiram ka na lang ng swr meter.
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Offline zer0w1ng

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Re: swr problem
« Reply #7 on: September 08, 2008, 09:02:55 AM »
You could simulate the antenna using NEC (Numerical Electromagnetic Code) simulator.
This software is free and many yagi-uda samples there.
This will give S11 as result which is directly related to SWR.

Download it here http://www.si-list.net/swindex.html .
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Philippine Electronics Forum

Re: swr problem
« Reply #7 on: September 08, 2008, 09:02:55 AM »
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