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- From: billn@hpcvaac.cv.hp.com (bill nelson)
- Subject: Re: SWR Tuning and PLL
- Message-ID: <1992Dec23.000947.20772@hpcvaac.cv.hp.com>
- Organization: Hewlett-Packard Company, Corvallis, Oregon USA
- References: <92Dec22.194729.17711@acs.ucalgary.ca>
- Date: Wed, 23 Dec 1992 00:09:47 GMT
- Lines: 21
-
- ming@enel.ucalgary.ca (Yang Ming) writes:
- : In article <1992Dec18.213844.7701@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- :
- : >Close. It is the ratio between the power reaching the antenna and the power
- : >reflected by the antenna.
- : >
- : Wrong. According to this definition, a perfect match will have SWR of infinity,
- : because a perfect match gives 0 reflected power. Actually, SWR is defined as:
- :
- : SWR = (1 + G)/(1 - G)
- :
- : where G is the absolute value of the reflection coefficient. SWR should be
- : always between 1 and +infinity, with 1 the perfect match and +infinity the
- : total reflection.
-
- So, how does this agree with what I said? I never stated that it was equal
- to a simple division. Matter of fact, I implied otherwise - either in the
- post to which you are responding, or another. I stated that an SWR of 1.2:1
- produces a power loss of about 4%.
-
- Bill
-