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"Frank Gilliland" wrote in message ... On Tue, 28 Jun 2005 23:17:15 -0500, Cecil Moore wrote in : Frank Gilliland wrote: Impedance matching of an SWR meter is generally unimportant since most SWR meters used for HF have a directional coupler that is much shorter than the operating wavelength. Point is that they are usually calibrated for Z0=50 ohms and are in error when used in Z0 environments differing from Z0=50 ohms, e.g. Z0=75 ohms. The point is that the error is insignificant when the directional coupler is much shorter than the wavelength. It is the directional coupler that is balanced for a particular value of Z0. Tam/WB2TT The error is even more insignificant when there are a host of variables and confounds between the SWR meter and the transmitted field that can (and frequently do) affect the objective -- field strength. It's much simpler (and just plain logical) to measure the field strength directly instead of measuring an abstract value halfway towards the objective and relying on nothing more than speculation that the rest is working according as expected. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |