"Fred W4JLE" wrote in message
...
Can you give us a magnitude, for example for a g5rv on 3.8 MHz fed with 50
feet of 50 ohm coax. Is it .5 or 5 dB?
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QST has on several occasions tested antenna tuners. The most recent one I
found was from last year. The worst case I saw was something like 40% loss
when matching an impedance of 6.25 Ohms on, I think, 40 meters. It is worth
noting that the 2KW tuners will have less loss than the 300W jobs. Also, the
loss depends on the impedance it sees, rather than the SWR. So, for an 8:1
SWR, the loss at 6.25 Ohms will be a lot worse than at 400 Ohms. Among other
things, the loss will then depend on the length of the feedline. The high
power tuners had a loss of less than 10% over most of the range.

Tam/WB2TT