This coupler will work. There is no good or bad one in terms of coupling factor, which is the 13dB.
This coupler will work. There is no good or bad one in terms of coupling factor, which is the 13dB.
Hey!, I did it!. I tested my antenna swr with the mictronic swr meter and it worked great!.
I have reduced the reflected power from 1,65 (with the wave trap ) to 0,10 changing the wave trap to a position a little further of the reflector.
Just one question, is it 0,10 a good reflected power ?
The swr gave me 1.0595.
Everything <2 is good, <1.5 is best, so no need to worry, 1.06 is excellent.
Great!!, Thank You.
Catamar: 1.65 SWR is 96% efficient. 1.06 is 99.7%. I'd consider that excellent.
-Alex
If it is broken, fix it. if it isn't broken, I'll soon fix that.
videoaerialsystems.com - Performance video piloting
Got my 433mhz stuff this morning thanks again Michael.
Getting some odd results. First colum is forward power and second is reflected, ignore the 3rd colum and lpf is with the lpf connected.
stock 200mw with lpf, 1.92000 1.10000 0.57292 3.68293
NAGOYA NA-771 SF 200mw with lpf, 1.38000 1.38000 1.00000 #DIV/0!
stock 500mw with lpf, 3.05000 0.90000 0.29508 1.83721
NAGOYA NA-771 SF 500mw with lpf, 3.00000 1.60000 0.53333 3.28571
stock 500mw, 3.06 0.63000 1.511852
NAGOYA NA-771 SF 500mw, 3.06000 2.03000 0.66340 4.94175
Last edited by NDw; 14th March 2012 at 08:08 PM.
What kind of TX do you use (stock)? What is the distance between antenna and your measurement setup?
And what is this LPF?
Last edited by Mictronics; 13th March 2012 at 09:18 AM.
I'm usng a chainlnik tx. Stock is the stock antenna that came with it, idk what it is but seems it's much better than the NAGOYA NA-771 SF. The is this lpf which reduces noise on the 1.3 video. The last two measurments had it removed.
And there is no distance between the antenna and measurment stuff. It is connected directly to the coupler.
Last edited by NDw; 13th March 2012 at 09:38 AM.
You may try to put the antenna away from the measurement setup using a coax extension. This way you will have the coax factor as part of your result, but with a good coax this is negligible.
Problem might be that you pick up radiated energy in your setup, especially in cables going to the meter. Also try to use only low power.
Alright I'll try getting an extension.
I'm using one of these to join the coupler to the tx. That couldn't be throwing things out significantly could it?
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