Re: [Discuss-gnuradio] software defined antenna

[rhubbell]

On Sat, 2008-10-11 at 11:08 +1030, Berndt Josef Wulf wrote:
> On Saturday 11 October 2008 09:14:48 Steve Totaro wrote:
> > On Fri, Oct 10, 2008 at 4:20 PM, John Ackermann N8UR <address@hidden> wrote:
> > > rhubbell wrote:
> > >> Hi all,
> > >>
> > >> After being on-frequency here for a little while I can see that the
> > >> range of experience/expertise is wide. Which is great.
> > >>
> > >> I'm curious if any long-timers have begun to look at software defined
> > >> antennas?  Or is there any effort at all anywhere in the public domain?
> > >> I guess military and universities don't really count for public as much
> > >> as they once did, but I'd guess they're working toward SDA also.
> > >
> > > I'm not sure just what you mean by "software defined antenna" but Vic
> > > Kean, K1LT, has been using an array of short vertical antennas fed to
> > > multiple ADCs and phased in software to receive on the 160M amateur band.
> > >  I don't have URLs handy, but I know he's made some postings about his
> > > work. Searching for "K1LT" and "SDR" would be a good start.
> > >
> > > John
> >
> > I could see a software controlled antennae, using software to control reed
> > switches and servos, but not a strictly software defined antennae, more
> > like a robotic antennae that could be populated with standard or predefined
> > settings for the antennae configuration, as well as manual control.
> >
> > I have a software controlled wifi antennae on my chimney, the software just
> > controls a servo for direction.
> >
> > I have this guy, which kicks butt and has come down in price quite a bit
> > http://cgi.ebay.com/WiFi-USB-24-dBi-YAGI-ANTENNA-2-4GHz-ULTRA-LONG-RANGE_W0
> >QQitemZ270284630828QQihZ017QQcategoryZ86720QQssPageNameZWDVWQQrdZ1QQcmdZView
> >Item
> >
> > Haven't used it in ice/snow but i assume that will be a problem and require
> > some kind of covering to keep the elements that stick off, jerking the
> > servo takes care of water build up from rain that can and does degrade wifi
> > signals.
> 
> Systems such as an over-the-horizon radar, such as the Jindalee project in 
> Australia, are possibly as close as it gets to be a SDA. It involves a little 

That sounds interesting. Will have a look.

> more than just an antenna rotator controller... 

Right, not antenna position control.
> 
> 73, Berndt
> VK5ABN
> 
> 
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