Longest line of sight (UK)

Discussion in 'General Discussion' started by Altrincham, 1 Oct 2016.

  1. Ianno87

    Ianno87 Established Member

    Messages:
    6,016
    Joined:
    3 May 2015
    The little 'ridge' the the M11 goes over near Harlow affords a fantastic view of the London skyline. Pretty sure it includes the Shard.

    The Shard is also, IIRC, visible from the windows of Terminal 5 at Heathrow.
     
  2. supersonic525

    supersonic525 Member

    Messages:
    8
    Joined:
    17 Nov 2019
    Location:
    Barnsley
    A quick look at the map and some areas of the North Wessex Downs could be candidates ie Walbury Hill.
     
  3. Altrincham

    Altrincham Member

    Messages:
    89
    Joined:
    22 Aug 2011
    Would be great to see your photos from Sheffield!

    That’s incredible about Cross Fell, and I’ve just been looking at Viewfinder Panoramas for that view. Amazing to see that it’s possible to see the Irish Sea off the North Wales coast (to the south/south-west) in one direction and then the North Sea to the north east of Newcastle. That would be an amazing photo to capture and would require phenomenal conditions to see both seas.

    http://viewfinderpanoramas.org/panoramas/ENG/CROSS.GIF
     
  4. Altrincham

    Altrincham Member

    Messages:
    89
    Joined:
    22 Aug 2011
    I’ve not been up the Shard but I’ve been on the London Eye and could see a dark stump, sat low on the western horizon, which was Windsor Castle.
     
  5. supersonic525

    supersonic525 Member

    Messages:
    8
    Joined:
    17 Nov 2019
    Location:
    Barnsley
    They are a bit grainy, I have some others somewhere - but you can make out the landmarks. The structures to the far right on the Minster upload are York Racecourse grandstand and Terry's chocolate factory. Can also see York Hospital to the far left. Humber.jpg Bils-horse.jpg minster-1.jpg
     
  6. supersonic525

    supersonic525 Member

    Messages:
    8
    Joined:
    17 Nov 2019
    Location:
    Barnsley
    Can see some detailing on the Minster here: DSC01089-01.jpeg
     
  7. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    Wow, so how far from Sheffield to the Humber Bridge
     
  8. supersonic525

    supersonic525 Member

    Messages:
    8
    Joined:
    17 Nov 2019
    Location:
    Barnsley
    It's just under 50 miles from this viewpoint. If you go further west into the hills, it's still easily visible.

    I've been trying to work out the longest line of sight just in England, might be able to see the Belmont transmitter from the Dales near Reeth, about 105 miles apart.
     
  9. DerekC

    DerekC Member

    Messages:
    1,035
    Joined:
    26 Oct 2015
    Location:
    Hampshire
    I have a memory from many years ago of standing with my dad somewhere on the Lleyn Peninsula in Wales and him pointing out that you could see the Wicklow Hills in Ireland. My amateur check suggests that this should be very possible - the probable location in Wales was Rhiw Mountain (301m), from which it is about 115 km to Lugnaquilla (925m) in the Wicklows. Can anybody confirm that this is doable - and has anyone got a photo?

    Looking at the map (which I should have done before) I don't think it could have been Rhiw Mountain because I can remember sea in the foreground - so more likely Mynydd Mawr right at the tip of Lleyn which is much lower (~160m)
     
    Last edited: 24 Nov 2019
  10. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    Thanks. The only reason I'm skeptical about see Belmont from such a distance is it's a long thin transmitter rather than a bloomin great big mountain like Snowdon.

    A fun game (well maybe) might be to get from Lands End to JoG viewpoint to viewpoint in the fewest possible hops....
     
  11. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    In that case might it be best trying to view the navigation beacon at night?
     
  12. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    I did think of that, but would that really be visible 105 miles away?

    In this case, seeing would quite literally be believing :D
     
  13. Altrincham

    Altrincham Member

    Messages:
    89
    Joined:
    22 Aug 2011
    These are great photos. Amazing to think how high Sheffield really is in order to see such distances.
     
  14. Altrincham

    Altrincham Member

    Messages:
    89
    Joined:
    22 Aug 2011
    Using Viewfinder Panoramas, I have looked at how it’s possible to see from the English Channel right up to the Atlantic Ocean at the top of Scotland. (With a bit more research it might be possible to tie-in with Lands End / John o’Groats).

    Starting point: Dartmoor (view south to Portland Bill and English Channel)

    Dartmoor to Foel Cwmcerwyn (Pembrokeshire)
    Foel Cwmcerwyn to Snowdon (Gwynedd)
    Snowdon to Merrick/Lamachan Hill (Dumfries & Galloway)
    Merrick to Ben Lui (Southern Highlands)
    Ben Lui to Ben Macdui (Cairngorms)
    Ben Macdui to Ben Hope (Sutherland)

    Ending point: Ben Hope (view north to the Atlantic, North Rona, and Orkney)
     
  15. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    Well, you can see asteroids millions of miles away in space so if the line of sight is there then no reason why not.
     
  16. Altrincham

    Altrincham Member

    Messages:
    89
    Joined:
    22 Aug 2011
    It seems that Belmont is visible from parts of Derbyshire, so I’d imagine that this is possibly the northern parts of Derbyshire on the South Yorkshire border. A cold night with crystal-clear conditions soon should hopefully show the mast’s lights.
     
  17. eMeS

    eMeS Member

    Messages:
    523
    Joined:
    12 Jun 2011
    Location:
    Milton Keynes, UK
  18. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    Asteroids are rather bigger than the lights of Belmont transmitter though!

    Possibly you could take an FM radio to the viewpoint and try 102.2 and 94.9, the two local stations on Belmont.

    If you could get them, it would be a pretty good sign, although of course FM signals do dip below the horizon a bit.
     
  19. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    I'm reminded of a certain episode of Father Ted... :D
     
  20. supersonic525

    supersonic525 Member

    Messages:
    8
    Joined:
    17 Nov 2019
    Location:
    Barnsley
    QUOTE="DerekC, post: 4302458, member: 31961"]Can anybody confirm that this is doable[/QUOTE]

    It is indeed doable! Looking at heywhatsthat.com, there are many places in the area of Rhiw where Lugnaquilla can be seen. Mynydd Mawr is further n/w though? Looking at Google Earth.

    As for Belmont, only one way to find out, I'll have a look next time I'm up that way - am a frequent visitor to the Tan Hill Inn! Nighttime may well be best as those beacons can be seen from some big distances. Assuming one is right on the top. The picture of the Bilsdale mast I took was from 64 miles away, but would need some really amazing conditions I'd think.
     
  21. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    I wonder if anyone has ever tried using line of sight walkie talkies to communicate over on of these super long distance views.

    I suspect the answer is that it wouldn't work, but in theory there is nothing to block the signal but the atmosphere.
     
  22. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    The inverse square law?
     
  23. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    Not something I'm familar with. What does it say?
     
  24. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    Signal strength drops off as the inverse square of distance - so for every doubling of the distance the signal strength drops by four times. Take the signal strength at 1km, double the distance to 2km and the signal strength drops to a quarter of what it was. By the time you get out to the kind of distances being considered here (>100km) the signal strength will be a tiny fraction of normal.

    https://energyeducation.ca/encyclopedia/Inverse_square_law
     
  25. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    Ok, thanks. I have seen some walkie talkies advertised that claim a 50 mile range in 'ideal conditions', whatever that means.

    I've no idea if these models are available in the UK, but 50 miles isn't so very far short of 100 km.

    My instinct is still that you would get nowt, but might be fun to try.
     
  26. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    I'm going to call BS on that. TV and radio transmission stations have outputs measured in tens of kilowatts to get coverage ranges that far. I can't see a handheld device being able of generating an equivalent signal.
     
  27. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
  28. najaB

    najaB Veteran Member

    Messages:
    20,930
    Joined:
    28 Aug 2011
    Location:
    Scotland
    Indeed it is. From the Wikipedia article:
    They're limited to 2W at maximum so it really would be exceptional if you could manage anything over 10km with any level of reliability.
    They most certainly are not.
     
  29. The Lad

    The Lad Member

    Messages:
    276
    Joined:
    22 Jan 2015
    You would stand a chance with Amateur kit, up to 100 watts and narrow band Vs broadcast wide band.
    Or just go up there with flash guns and a schedule.
     
  30. Comstock

    Comstock Member

    Messages:
    492
    Joined:
    19 Jun 2012
    Certainly, in the days before the FM band filled up you could get really clear reception on stations from Winter Hill and Emley Moor in South Derbyshire with a roof aerial. Thats about 60 to 70 miles. But those stations were 5000 and 2500 watts respectively, a lot more than even the amateur kit.

    Anyway, getting slightly off topic.....
     

Share This Page