[Antennas] Eighty Meter mobile or portable
Terry Conboy
n6ry at arrl.net
Wed Apr 23 22:02:17 EDT 2008
At 11:22 AM 2008-04-23, Dick - KA5KKT/4 wrote:
> Would it be worthwhile to consider an attaching bracket whereby the angle
>between the two can be ~120 degrees rather than 180 degrees. Is this not
>how an Inverted Vee antenna provides an ~50 Ohm impedance as vs. the 72 or
>so Ohms of a dipole?
Most mobile whips have very low radiation resistance, so using two of
them in a linear dipole configuration is still likely to be under 50
ohms. A hairpin match (a small shunt inductor across the feedpoint)
is effective at raising the impedance to 50 ohms without further
narrowing the bandwidth.
If you have a mobile whip that is 50 ohms without any matching
device, it is probably very lossy.
73, Terry N6RY
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