Dr. Slick wrote:
This is a push-pull VHF 300 watt transmitter with a coax stub
harmonic filter on the output. My digital Daiwa will read about 310
watts incident power using a 4 foot RG-8X jumper coax (from filter to
meter), and about 240 watts using a 12 foot section of RG-8X!!?? VSWR
stays the same at about 1.4:1 .

Remember the maximum power transfer theorem? The transmitter probably works
better into some impedances than into others. With an SWR of 1.4:1, the
transmitter will see a resistance between 35.7 ohms and 70 ohms with a reactance
between zero and about plus or minus j15. Knowing the frequency and VF of the
RG-8X, you should be able to estimate the two impedances seen by the transmitter.
--
73, Cecil http://www.qsl.net/w5dxp



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