D A B Aerial

Discussion in 'Tech/Mech General' started by Geordies, May 12, 2015.

  1. Geordies

    Geordies Funster

    Joined:
    May 29, 2013
    Messages:
    935
    Likes Received:
    2,124
    Location:
    Tyneside
    I'm thinking of fitting a DAB radio , does anyone have experience of fitting an aerial for DAB on a windscreen which has built in heating element. Transit mk7 to be exact.

    Or even fitting the aerial in the over cab?
     
  2. Yorick

    Yorick Funster

    Joined:
    Oct 1, 2013
    Messages:
    3,924
    Likes Received:
    5,662
    Location:
    Lanzarote
    I just used a cheapy magnetic one from Halfords and put it on the roof :)
     
  3. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,455
    Likes Received:
    16,885
    Location:
    YO11 2BD
    Thats ok if you have a PVC.....not many coachbuilts with tin roofs.
     
  4. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    29,455
    Likes Received:
    16,885
    Location:
    YO11 2BD
    Halfrauds and cheap should never be used in the same sentence.

    Halfrauds ARE NOT CHEAP.
     
    • Like Like x 3
  5. scotjimland

    scotjimland Funster Life Member

    Joined:
    Jul 25, 2007
    Messages:
    28,934
    Likes Received:
    25,574
    Location:
    .
    just recently bought a Sony DAB radio and Autoleads window film aerial.. from Halfords..

    still haven't got the radio to work on DAB , I think it's because the Hymer has no metal in the window A pillar to ground the aerial.. think I'll need to run an earth wire up to the aerial to give it a ground plane

    The aerial instructions make no mention of heated windscreen, but advise against mounting on polarised screens. .
     
    Last edited: May 12, 2015
    • Like Like x 1
  6. tonyidle

    tonyidle Funster

    Joined:
    Aug 6, 2013
    Messages:
    2,867
    Likes Received:
    2,685
    Location:
    Kendal, Cumbria
    Their trade prices are pretty competitive.
     
  7. scotjimland

    scotjimland Funster Life Member

    Joined:
    Jul 25, 2007
    Messages:
    28,934
    Likes Received:
    25,574
    Location:
    .
    update..
    just been out and ran a temporary wire from the film aerial's ground plane to the van chassis, and it is working.. but not 100% ... maybe that's down to where we live on the fringe of DAB reception
     
  8. EssexBoy

    EssexBoy Funster

    Joined:
    Feb 5, 2009
    Messages:
    314
    Likes Received:
    203
    Location:
    South Essex
    I use a small magnetic mount aerial from halfords. I glued a large washer to the plastic trim in the quarterlight window frame of our A class... works a treat...
     
    • Like Like x 1
  9. scotjimland

    scotjimland Funster Life Member

    Joined:
    Jul 25, 2007
    Messages:
    28,934
    Likes Received:
    25,574
    Location:
    .
    can you show a picture ?
     
  10. EssexBoy

    EssexBoy Funster

    Joined:
    Feb 5, 2009
    Messages:
    314
    Likes Received:
    203
    Location:
    South Essex
    Sure @ScotJimland...
    I'm on the train home from work right now, but will take a pic later...
     
    • Like Like x 1
  11. Yorick

    Yorick Funster

    Joined:
    Oct 1, 2013
    Messages:
    3,924
    Likes Received:
    5,662
    Location:
    Lanzarote
    Just remembered I've got a spare magnetic aerial if anybody wants one :)

    Just pay the postage :)
     
  12. EssexBoy

    EssexBoy Funster

    Joined:
    Feb 5, 2009
    Messages:
    314
    Likes Received:
    203
    Location:
    South Essex
    Here you go Jim..

    The window frame slopes, so I bent the twig at the base so it stayed vertical...

    The camera angle makes the aerial look all out of kilter, when it actually isn't...
     

    Attached Files:

    Last edited: May 12, 2015
    • Like Like x 2
  13. Geordies

    Geordies Funster

    Joined:
    May 29, 2013
    Messages:
    935
    Likes Received:
    2,124
    Location:
    Tyneside

    I'm surprised you can get DAB on that aerial, thought it was really fussy about reception ?
     
  14. EssexBoy

    EssexBoy Funster

    Joined:
    Feb 5, 2009
    Messages:
    314
    Likes Received:
    203
    Location:
    South Essex
    It is a DAB aerial. Got it at the same time as the new stereo from Halfords
    Works a treat...
     
    • Like Like x 3
  15. scotjimland

    scotjimland Funster Life Member

    Joined:
    Jul 25, 2007
    Messages:
    28,934
    Likes Received:
    25,574
    Location:
    .
  16. Abacist

    Abacist Funster

    Joined:
    Oct 15, 2013
    Messages:
    1,198
    Likes Received:
    1,233
    Location:
    Devon
    So far I have not been impressed with DAB in any vehicle. It cuts out at a critical point in the news or a song that you enjoy. Got a BMW mini and a 1 series BMW.

    MoHo reception is none too brilliant either but I put that down to the aerial in the side mirror housing and the head unit deals with both the TV and the reversing camera view so not keen to change it!
     
  17. Geordies

    Geordies Funster

    Joined:
    May 29, 2013
    Messages:
    935
    Likes Received:
    2,124
    Location:
    Tyneside
    If DAB radios work inside a house thro bricks and mortar, you'd assume fitting an aerial like used by Essexboy, behind the overcab fibreglass would work. I realise I'd have to manufacture an earth plane for it to bolt to. Any thoughts on that ??

    I think I'll fit a stick on aerial to the part of the screen clear of the heating element, see how it goes, if it's not too clever try going behind the fibreglass on the overcab, tho that is a bigger job.
     
  18. Jaws

    Jaws Funster Life Member

    Joined:
    Sep 26, 2008
    Messages:
    18,321
    Likes Received:
    21,600
    Location:
    Narrfoook
    Looking at the picture I would say that antenna is a pretty good compromise ( but it is a 1/4 wave and really needs a metal ground plane for optimum performance )

    DAB is transmitted on 174 to 239 megs.. very very big band width !

    The only true DAB antenna you would not want to fit on a vehicle as it would either be huge or require an automatic ATU ( aerial tuning unit ) to work

    AND....

    Just to make matters more interesting, some DAM transmitters use horizontal polarisation and others vertical..
    In english, that means a normal vehicle type aerial which is mounted vertically will give VERY poor results if the local transmitter is radiating on a horizontal plane

    As a by the by, as convenient as stick on aerials are, they do display an amazing lack of performance :(

    And that folks is pretty much the sum total of what I know about DAB !!!

    If someone could let me know what type of connector is used for the supplied antennas I might be able to take an educated guess at certain ( boring ) things and come up with a half decent design for a home brew jobby (y)
     
  19. Geordies

    Geordies Funster

    Joined:
    May 29, 2013
    Messages:
    935
    Likes Received:
    2,124
    Location:
    Tyneside
    Jaws, I saw the following link..............http://nears.forumotion.co.uk/t365-car-dab-antenna-test-which-one-should-you-go-for#1090.................... and after reading thro it, I am pretty certain that I will NOT be fitting a DAB with a windscreen stick on aerial. I will just buy and fit the radio and then look into how to somehow fit an aerial in the overcab, behind the fibreglass. The lad who wrote the article lives in same town as me, but without joining his forum am a bit stuck on how to contact him.

    So basically if you can give an advise on the aerial fitting as described, I'd be very grateful.
     
    • Like Like x 1
  20. mikekaren2

    mikekaren2 Funster

    Joined:
    Dec 5, 2013
    Messages:
    314
    Likes Received:
    246
    Location:
    Somerset
    image.jpg
    Jim I had the same problem, I bought a sheet of Conductive self adhesive copper sheeting from Amazon & cut a piece that runs from the metal windscreen frame over the window rubber & onto the glass & connected the eart there. I then used an indelible black marker pen to colour the copper sheet.

    http://www.amazon.co.uk/gp/product/B00A235WDA?psc=1&redirect=true&ref_=oh_aui_detailpage_o07_s00

    Photo (not very good, attached)
    Mike
     
    Last edited: May 15, 2015
    • Like Like x 1
Loading...

Share This Page