Should work great for close in work, out to about 200-500 miles. On 11 Jan 2006 at 11:43, John Lawson wrote:
> > I don't even play one on TeeVee... > > So, in advance of a lot of EZNec work (and I don't have the experience > with that program to derive much 'good' out of it right now) - I'd like > to ask what may seem to be a rather obvious HF antenna question. > > Due to the usual reasons - my HF antenna is a loop suspended from my > backyard fence - approx 430' total, closed loop, 5' off the ground, fed by > 450 ohm ladder line back into the shack, using an Ameritron ATR-15 tuner > to match the system to my Valiant. The tuner and transmitter are bonded > to a very heavy ground system via an 8' stake less than 3' from the gear. > There is no ground system under the antenna, other than that which Nature > provided - and with the current winter conditions, the ground is rather > wet and conductive. > > This antenna system exhibits the following SWR: > > 160M - 1.3:1 > 80M - 1.1:1 > 40M - +3:1 > 20M - 2:1 > 15M - +3:1 > 10M - +3:1 > > The tuner capacitors end up being all-the-way-meshed on the > 'misbehaving' bands - not so on 160, 80, and 20. > > > So I'll see Y'all on 3880 and just fergit the rest. ;} > > > No but seriously folks: obviously the feedpoint resistance is outside > the tuner's ability to cope with it at various frequencies. > > I'm thinking the first unscientific experiment might be to go to the > opposite side of the loop from the feedpoint and cut it into a big > horizontal bent dipole - mainly because that will take about 45 seconds to > accomplish - one of the benefits of having one's entire antenna at > ahoulder-height. > > But I'd like to get some other opinions - I know there's an electrical > Pattern here from the info - and I have some other ideas based on that. > > And no, I can't put up a "real antenna" so I'm pretty much comiited to > making this one work as well as I can. Until I move the QTH to somewhere > with a few acres and room for Lots of Wire. > > > Cheers > > John KB6SCO > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb >
