"Antonio Vernucci" wrote in message
...
I have recently mounted a 6-meter long Yagi. The driven element is a
(non-folded) dipole whose impedance is brought up to 200 ohm by
significantly shortening it (so introducing a high series capacitive
reactance) and using a (rather small) hairpin to resonate the residual
reactance. The system is fed by a 4-to-1 balun (200-to-50 ohm) made of a
half-wavelength cable. The SWR at resonance is almost perfect, but the SWR
response vs. frequency is very sharp, this meaning that the system has a
high Q. I am wondering whether such a 200-ohm feed technique could cause
non negligible losses caused by the higher current circulating in the
hairpin (due to its low reactance as well as to the high voltage on the
high-impedance feed point, that is 200 ohm + reactance of the shortened
driven element). 73 Tony I0JX

I wonder what you consider narrow bandwidth. 500 KHz seems to be about par
for a decent 6 m beam.

Tam/WB2TT