The legal limit is defined in terms of EIRP,
1 to 5 watts. You only need a few percent
efficiency if you have a reasonably powerful
transmitter. Any decent 160 meter transmit
antenna, with additional base loading, will
be fine. Transmit arrays of course don't make
BTW, the wavelength is 630 meters.
On 2/13/2012 6:48 AM, Rik van Riel wrote:
> Things are looking good at WRC-12. Approval of an international
> amateur radio allocation around 470 kHz seems very likely:
> This does, of course, lead to the question of antennas.
> What can people without a few acres to dedicate to 600m do to
> get a vaguely decent antenna?
> I started modeling an inverted L with an FCP and a loading
> coil the size of a rain barrel. Then I added more top wires,
> in more directions, and the loading coil is only half the size
> of a rain barrel :)
> Before loading coil losses, gain is about -10dBi!
> Nowhere near as easy as 160m, but this could be a very
> interesting antenna challenge for hams...
UR RST IS ... ... ..9 QSB QSB - hw? BK