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star22
Joined: 19 Feb 2005
Posts: 85
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 09 Dec 2005 9:23 how to measure reverse power |
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hi freinds
how can measure "power"and "SWR" for antenna?
please guide me
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09 Dec 2005 9:23 Ads |
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demogro
Joined: 25 Nov 2005
Posts: 3
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09 Dec 2005 18:07 how can measure "power"and "SWR" for ant |
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i think you mean without meters... i advice with lamb..put a lamb arround the anttenna ...where the light is better swr is better 
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flatulent
Joined: 19 Jul 2002
Posts: 4875
Helped: 324
Location: Middle Earth
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09 Dec 2005 18:26 Re: how can measure "power"and "SWR" for |
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There are meters designed for this. They are put in the transmission line.
If your circuit does not allow this, such as the transmitter and antenna being on the same substrate material, it is more difficult. You might want to cut the substrate material and put a transmission line between them with the meter.
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rautio
Joined: 21 Feb 2005
Posts: 297
Helped: 23
Location: North Syracuse, NY
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09 Dec 2005 20:00 Re: how can measure "power"and "SWR" for |
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| If your antenna is HF or VHF, get a Bird wattmeter. They are the best, but kind of expensive. There are also cheaper competitors. You also have to buy an "element" that plugs into the meter that is designed for your power level and frequency band. To measure the power in the reverse direction, just reverse the element. With forward and reverse power known, you can calculate SWR. You also have to specify what kind of coax connector you want. I bought one of the cheaper wattmeters about 5 years ago, works really well.
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plasma
Joined: 20 Dec 2001
Posts: 577
Helped: 40
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11 Dec 2005 1:18 Re: how can measure "power"and "SWR" for |
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Hi star22
If you can connect Directional coupler. you can measure with low power
Instruments in one port the Tx power and the second port the reflected power (vswr=reflect/Tx). Don't forget to add the coupling.
PL
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