On Sep 26, 5:13*pm, "Richard Fry" wrote:
"Art Unwin" wrote... Now the antiresonant point will be between 100 and 200 ohms
resistive *which allows me to feed it directly from a 50 ohm
transmission line (3/4 andrews) with negligable losses as
the mismatch is resistive.

__________

Art -

An antenna with an input impedance of 150 + j 0 ohms has a reflection
coefficient of 0.5 (50%), a return loss of 6.02 dB, and an SWR of 3:1 to a
50 ohm source. *Probably not many transmitters would be happy with that
magnitude of load mismatch.

Do you maintain that the losses defined by these parameters are negligible
to amateur radio operators?

RF

Not when you are in the experimental mode. My output are tubular
and while I am experimenting I am loath to add a transformer.
Must admit I am very surprized at the losses you calculated.
I would have thought it have been about half of that but then I should
have looked it up
instead of relying on the 3/4 andrews keeping things down. For
recording the resistance and capacitance
over a few megerhertz I aam comfortable with what I am doing since
things will change when I take it off the 50 gallon plastic drum.