|[AMRadio] I'm not an antenna expert|
bcarling at cfl.rr.com
Wed Jan 11 11:53:16 EST 2006
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
> 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.
> John KB6SCO
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