[UK-CONTEST] Aircraft Reflection

[Rob Harrison]

Morning John,

You're correct in your assumption re hills. I find that I get an increase in 
signals from fairly near stations when aircraft go over here at lower 
levels, under 10,000ft. I'm assuming it works like having a much higher 
antenna! The effect seems more noticable on 6 & 4 metres, although 
occasionally on 2m.

I'd also assume a reasonable amount of erp would be needed on the higher 
bands for repeatable success. Your average 100w and 9 ele on 144 wouldn't do 
the job most of the time. Though I've not done any sums on the subject. I'd 
like to be proved wrong though.

73

Bob G8HGN


----- Original Message ----- 
From: "John Lemay" <john at carltonhouse.eclipse.co.uk>
To: "'Ray James'" <gm4cxm at yahoo.co.uk>; "'UK Contesting'" 
<uk-contest at contesting.com>
Sent: Tuesday, March 22, 2011 10:25 AM
Subject: Re: [UK-CONTEST] Aircraft Reflection


>
> Hello Ray
>
> Thanks for putting the information on your web pages - it's certainly
> interesting and it prompts me to ask a couple of questions:-
>
> It's too early in the day for me to delve into spherical geometry. Is it
> reasonable to assume that a plane at say 40,000ft at your mid point is
> approximately at zero degrees elevation, for both parties ? It occurs to 
> me
> that for stations located behind a hill ('Morning Bob!), the reflection
> technique could still be useful, but with shorter paths, so long as the
> plane is not behind the obstruction.
>
> Could you say a little bit more about equipment requirements? I see that 
> on
> 70cms you have about 100w and 2 yagis. How is OZ1FF equipped? Could you
> conclude that a more basic station (say 50w to a single yagi) would 
> struggle
> to make effective use of aircraft scatter ?
>
> Regards
>
> John G4ZTR
>
> -----Original Message-----
> From: uk-contest-bounces at contesting.com
> [mailto:uk-contest-bounces at contesting.com] On Behalf Of Ray James
> Sent: 21 March 2011 17:50
> To: UK Contesting
> Subject: [UK-CONTEST] Aircraft Reflection
>
> Hi all,
> Following my talk at last years convention and on-air activities, I get
> regular requests for more information on the use of aircraft reflection as 
> a
> means of nabbing some nice distant contacts under flat tropo conditions 
> and
> contests on UHF and Microwave bands.
> Much of the content from the memory stick is retained for club talks I do
> but aircraft reflection appears to be to the most popular personal 
> request.
> I have therefore added a page to my website on the operational side of the
> subject and trust those interested will find it useful.
>
> http://www.rayjames.biz/gm4cxm/id28.html
>
> 73 Ray GM4CXM
>
>
>
>
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