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 Angle of Arrival statistics 
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Post Re: Angle of Arrival statistics
I think we're rapidly approaching the point in this country where people anywhere near urban environments are going to be needing seperate receiving antennas such as a Wellbrook Loop.

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Conor, M0GVZ

TS480SAT, TM-D710, Little Tarheel II
io94SA


Mon Jan 10, 2011 11:37 pm
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 Angle of Arrival statistics 
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Ah, you're possibly in the same "My QTH is bolloxed" :lol: :lol: boat I was in.

For me it was QRM. At my old house, which is 100 feet from my new house, QRM was a problem - up to S9 on 10m. Here, very little and S0 on 10m. I can drive past the old house and watch the S meter rise then drop.

Having had an OFCOM field engineer round for a PLT complaint I put in, he said there was a source of noise I could do nothing about.

One thought: When driving within the close proximity, say 10ft - 20ft of an overhead powerline, I observe S9 signals drop out of the box, I guess the EMF around the cables is the problem. Is there anything buried in the ground or overhead like that?

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Conor, M0GVZ

TS480SAT, TM-D710, Little Tarheel II
io94SA


Tue Jan 11, 2011 11:42 am
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 Angle of Arrival statistics 
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Post Re: Angle of Arrival statistics
Does Lee live on top of a giant copper meteorite that crashed many millions of years ago and now acts as a groundplane below his antenna farm?

Or,he goes around in the middle of the night dosing the ground with a strong saline solution?

The ground beneath his antennas is less disturbed than that of your modern house which probably has half a pallet of wasted bricks and the remains of a broken cement mixer buried in it?

I'm struggling for ideas here Kev :D but in all fairness that poor location question mark is a bit of a wind up for all of us as by rights the further south and west you go the easier certain contacts should be but listening to a guy in Hungary from here in Dorset the other evening he was pulling in VKs at the same time as W6s and positively racing through the contacts while acknowledging European stations too I sat there chewing the edge of the desk my radio sits on as I could bare here the W6 let alone the VK station.....that having been said I could hear a couple of Indonesian stations last night so all is not lost although I didn't get a chance to work them in the ensuing scrum....this is all on 40 metres on my vertical.

Cheers,Dave.


Tue Jan 11, 2011 12:41 pm
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 Angle of Arrival statistics 
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M0TNX wrote:
You are dead on about the bricks and rubble beneath the soil here, it was a bit of a struggle to get 30 odd radials out, just a couple of inches below the surface and you can hit Brick. The estate where we live was re-built 20 ish years ago, and before that it was flats, before that it was part of Rolls Royce, so gawd knows what's under here!!


That's got to have a big impact as basically it would be the same as laying radials on poor ground I would have thought. I wonder how many off cuts of rebar is buried under there as well.

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Conor, M0GVZ

TS480SAT, TM-D710, Little Tarheel II
io94SA


Wed Jan 12, 2011 1:42 pm
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 Angle of Arrival statistics 
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Post Re: Angle of Arrival statistics
For info: at 10MHz, the "skin depth" in average soil is 4m, in poor soil 12m, and in good soil 1m. At 2MHz you can double those values.

73,
Steve G3TXQ


Wed Jan 12, 2011 3:28 pm
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 Angle of Arrival statistics 
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Post Re: Angle of Arrival statistics
G3TXQ wrote:
M0GVZ wrote:
Its interesting that apart from Europe on 10m, the 1/4 wave has the better takeoff angle. A simple 1/4wave groundplane is hard to beat.

Conor,

Not sure I follow that conclusion. A dipole at 1/2 WL is always superior to the vertical at any take-off angle - so it must beat it on every path.

73,
Steve G3TXQ


Sorry its taken me nearly a week to reply as its just taken me a week to realise what mistake I've been making.

I read the graph wrong, lol. No - correction - I read the graph how I wanted to read it. :P I'd got in my head the trace for the 2WL high dipole was the 1/4 wave vertical.

I'll get me coat.

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Conor, M0GVZ

TS480SAT, TM-D710, Little Tarheel II
io94SA


Thu Jan 13, 2011 12:51 pm
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