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Are pi networks THAT INefficient?
Ralph Hanna, W8QUR, in a brief article "Pi Networks" on page 108 of
the December, 1965, issue of 73 MAGAZINE, after discussing power- supply filters and high- and low-pass TV filters, wrote: (Paraphrasing) "The most popular of all pi networks is the output circuit of a transmitter ... with which the output of almost any transmitter can be matched to almost any antenna ... another advantage is the reduction of harmonics.... (Actual quote) "The big disadvantage of this system is the low efficiency. It is not possible to run more than 50% efficiency and it tends to be more like 30%. Other methods of feeding the antenna will result in efficiencies of as high as 65% to 70%." Is that "low efficiency" of 30-50% really true? --Myron, W0PBV. -- --Myron A. Calhoun. Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge NRA Life Member & Certified Instructor for Rifle, Pistol, & Home Firearm Safety Also Certified Instructor for the Kansas Concealed-Carry Handgun (CCH) license |
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