[UK-CONTEST] Aircraft Reflection Path Plot (off topic)

[Ray James]

Hi Bob,
You're correct.
It coincided with the May 2011 6m and SHF UKACs and the effect was dire.
The 6m contest appears to have caught the end of an Es opening but otherwise most report a severe lack of ability to hear anything of long UK distance to work.
I was on 13cm in the SHF event and made just 4 contacts.
ODX was Kjeld OZ1FF at 782km who I work on a regular basis via aircraft reflection so I'm guessing that was a tropo enhanced contact that month. Too long ago to remember!

73 Ray GM4CXM



________________________________
 From: Rob Harrison <robharrison at g8hgn.freeserve.co.uk>
To: uk-contest at contesting.com 
Sent: Wednesday, 11 January 2012, 12:49
Subject: Re: [UK-CONTEST] Aircraft Reflection Path Plot (off topic)
 
Hi Ken,

Your observations are right. I firmly beleive most of our tropo' contacts 
are actually via AS. It was noticable when the volcano erupted and many a/c 
were grounded, it conicided with a UKAC I think.

73

Bob G8HGN

----- Original Message ----- 
From: "Ken Eastty" <ken.g3lvp at btinternet.com>
To: <uk-contest at contesting.com>
Sent: Wednesday, January 11, 2012 12:44 PM
Subject: Re: [UK-CONTEST] Aircraft Reflection Path Plot (off topic)


> Web based 'radars' derive their data from receivers like the SBS units and
> as I understand it Mode S transponders don't transmit position data, only 
> ADS-B
> does this.
>
> Apparently only about 75% of airliners are fitted with mode B transponders
> (plus very few small aircraft&  helicopters flying to N.Sea Oil Rigs).
> Therefore it's not always evident what's responsible for the reception of 
> some DX signals
> when there's no tropo enhancement.
>
> Many observations of 'ANG from here seem to indicate that the signal is 
> stronger when there's
> a 'cloud' of airliners over the Lancashire coast as opposed to a single 
> aircraft the actual path
> mid-point. I guess that lots of curved reflectors work better than a 
> single surface but a
> Concorde might have worked better(if only). The orientation of the 
> aircraft appears to make little difference.
>
> If (when) Eyjafjallajokulleruptsagaincausing another grounding fiasco
> and that coincides with a VHF contest I would expect to see best DX worked
> being much reduced unless there happens to be a good tropo opening at the 
> same time!
>
> Wouldn't Watson-Watt have enjoyed playing with these toys?
>
> 73...
>
> Ken
>
> G3LVP
>
>
>
>
>
> Your SBS will plot aircraft that FR24 won't see, for various reasons. A 
> lot
> of the propjets and small twin airliners, plus lots of executive and light
> don't have Mode B (broadcast) and the web based radars don't see them. So
> it'll be a little while before your box is redundant.
>
> FR24 is fine for AS contacts as it generally see 99% of the big jets.
>
> Bob G8HGN
>
>
>
>
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