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- From: ming@enel.ucalgary.ca (Yang Ming)
- Newsgroups: rec.radio.cb
- Subject: Re: SWR Tuning and PLL
- Message-ID: <92Dec22.194729.17711@acs.ucalgary.ca>
- Date: 22 Dec 92 19:47:29 GMT
- References: <BzF5t6.I3B@acsu.buffalo.edu> <1992Dec18.213844.7701@hpcvaac.cv.hp.com>
- Sender: news@acs.ucalgary.ca (USENET News System)
- Organization: ECE Department, U. of Calgary, Calgary, Alberta, Canada
- Lines: 20
- Nntp-Posting-Host: eneli.enel.ucalgary.ca
-
- In article <1992Dec18.213844.7701@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes:
- >v054rtzw@ubvmsb.cc.buffalo.edu (RUFUS) writes:
- >:
- >: Jason,
- >: An SWR meter measures the Standing Wave Ratio hence SWR. What SWR is is the
- >: amount of reflexed power recieved by your rig from a mistuned antenna. A
-
- >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.
-
- Ming.
-