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USB TV Tuner

Discussion in 'Hobby Electronics' started by Harry, Apr 26, 2012.

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  1. Harry

    Harry Guest

    Recently bought USB TV Tuner: Compro Videomate U620F

    Finding that only ABC and SBS is picked up with included antenna. This is
    not so bad since the other channels are mostly rubbish, but I have a few
    questions:

    1. Do the ABC and SBS broadcast stronger signals because they are government
    channels and they are required to provide a service?

    2. What influence does the length of the rabbit ears of indoor TV antennas
    have on reception?

    3. What influence does electricity-powered signal amplification have on
    reception?

    4. Do external house antennas rely on electricity?

    5. What would be the best way to improve reception using an indoor antenna?
    Antenna size/length? Electricity powered signal amplification?
     
  2. atec77

    atec77 Guest


    trolling removed

    add rabbit ears OR an external antenna and enjoy




    X-No-Archive: Yes
     
  3. felix_unger

    felix_unger Guest

    what trolling? obviously just wanted info

    --

    rgds,

    Pete
    -------
    “If Julia is the answer, then what was the stupid question?!”

    "Julia finally got something right. Older people don't vote Labor, because they have seen too many incompetent, mismanaging, money-wasting Labor governments"

    "If the WORLD as a whole cut ALL emissions tomorrow, the average temperature of the planet's not going to drop for several hundred years, perhaps over on thousand years" - Tim Flannery, Climate Commissioner

    “Wayne Swan threatening the Banks, is a bit like being savaged by a dead sheep!”

    Give Juliar the boot!.. http://ausnet.info/pics/boot.jpg
     
  4. Harry

    Harry Guest

    Already tried cheap rabbit ears but not much joy. Hence my questions which
    you snipped and criticised.
     
  5. SG1

    SG1 Guest

    The bigger the better.
    Can't comment on that one.
    Only those with signal amplifiers.
    Hook up to an external antenna, the house should have one.
     
  6. Clocky

    Clocky Guest

    In strong signal areas you might get away with rabbit ears but even in
    medium areas you will likely need a basic external antenna pointed in the
    right direction.

    Boosters can be helpful but you need a signal to amplify, so if the
    reception is really poor it won't help.
     
  7. Sylvia Else

    Sylvia Else Guest

    Broadcasts are from different places. The obvious idea of coordinating
    broadcasting so that transmissions serving an area all come from the
    same place is apparently beyond the abilities of Australian regulators.
    So the strength of the signal depends, amongst other things, on where
    you are relative to each transmitter.
    As an energy source, you mean? Not unless they have a mast amplifier.

    Sylvia.
     
  8. Harry

    Harry Guest

    Is height the biggest factor?

    Intended use will not involve external antenna so not an option.
     
  9. felix_unger

    felix_unger Guest

    no. maybe you are closer to their transmitters, or their frequencies are
    being received better
    the longer the better
    normally it only amplifies what is being received, unless it's a more
    sophisticated kind that filters the noise and boosts the signal
    no, but you can use a powered mast head amplifier that requires DC
    voltage up the antenna cable
    put it up as high as possible, and you could use something like this..
    http://www.jaycar.com.au/productView.asp?ID=LT3133&keywords=indoor+antenna&form=KEYWORD

    generally the best solution is to use an external antenna, even a small
    one just mounted on the gutter, or in the ceiling unless you have an
    iron roof, is better than an internal antenna where the signal has to go
    thru walls, etc.

    http://www.radioparts.com.au/ProdVi...0&ProdDesc=COMBO20+COMBINATION+20DB+AMPLIFIED


    --
    rgds,

    Pete
    -------
    “If Julia is the answer, then what was the stupid question?!”

    "Julia finally got something right. Older people don't vote Labor, because they have seen too many incompetent, mismanaging, money-wasting Labor governments"

    "If the WORLD as a whole cut ALL emissions tomorrow, the average temperature of the planet's not going to drop for several hundred years, perhaps over on thousand years" - Tim Flannery, Climate Commissioner

    “Wayne Swan threatening the Banks, is a bit like being savaged by a dead sheep!”

    Give Juliar the boot!.. http://ausnet.info/pics/boot.jpg
     
  10. Harry

    Harry Guest

    I ask the question generally. Would an external house antenna be connected
    to electricity, on average?

    What is the reason they are better than indoor antennas? Height,
    electricity, or some other factor?
     
  11. atec77

    atec77 Guest

    The answer is deserved , google the answer or take the advice which is
    valid

    --









    X-No-Archive: Yes
     
  12. Phil Allison

    Phil Allison Guest

    "Harry"

    ** Only rarely in a domestic situation.

    Antennas on tops of buildings and blocks of units are another story.


    ** Having an unobstructed line through the air to the transmitter sites is
    the big one - results in a much stronger and much cleaner signal. Plus you
    can put up a physically large and efficient antenna that would be absurd
    indoors.

    It is a near miracle that indoor TV antennas work at all - everything is
    against them.


    .... Phil
     
  13. Harry

    Harry Guest

    I remember years and years of using indoor antennas. Is digital TV the
    reason why they are no longer viable?
     
  14. Rob

    Rob Guest

    This is a requirement of the public broadcaster/s to ensure a good
    signal is provided to everyone.
     
  15. terryc

    terryc Guest

    Clear line of sight between aerials will have a bigger influence.
     
  16. Phil Allison

    Phil Allison Guest

    "Harry the Fuckwit TROLL "

    ** Truth is, they were never any good with analogue TV.

    With DTV the need for a clean, strong signal is more crucial - if annoying
    drop outs are to be avoided.


    ..... Phil
     
  17. Krypsis

    Krypsis Guest

    Fully extended, they should be tuned to the middle of the TV frequency
    spectrum.
    Height is always a factor but that is mainly to get above line of sight
    obstructions such as houses, trees, etc.From no signal on analogue to just acceptable. Digital is more picky.

    Apartment buildings where signals are split between multiple apartments
    usually use amplification. Houses only need it if the signal is low to
    begin with.
    Get a powered antenna that has the highest gain.
    Amplified antenna will be your only option. I think the digital TV
    signals occupy a slightly higher spot in the spectrum so a standard UHF
    antenna will work but may degrade at one end. Get one suitable for
    digital transmission and you should be ok.

    We use a signal booster on the TV in the bedroom - too many walls, too
    many trees, too far from the outside antennaa. Used to work on analogue
    quite ok but some channels snowy. No good whatsoever on digital. May
    need to install a splitter and run a cable from the outside antenna to
    solve my issue.

    In your case, I suggest you either borrow a amplified antenna and try it
    or get a guarantee from the shop that you can return with no penalty if
    it isn't up to scratch.
     
  18. Phil Allison

    Phil Allison Guest

    "Krypsis"
    ** Err no.

    Fully extended they tune to channel 2, half extended is channel 7.


    ** You seem to be unaware that DTV is mainly on VHF channels in all capitol
    cities.

    The VHF channels used are 6, 8, 9A, 11 & 12 plus a couple of UHF channels
    for SBS etc.

    DTV antennas for capitol city use are quite compact and cover all the above.


    ..... Phil
     
  19. Krypsis

    Krypsis Guest

    Generally no.
    External antennae a usually placed in a high position clear of line of
    sight obstructions. As well, they have a much higher gain factor and you
    can see this by the number of elements on them. The rabbit ears are a
    basic dipole antenna and will have two active elements only. A
    directional external antena will have the two active elements plus a
    variable number of director and reflector elements. Director elements
    are progressively shorter whilst reflector elements are progressively
    longer than the active elements. Directional antennae, like those on the
    rooves of houses everywhere, provide much more signal gain.

    http://tinyurl.com/2xetan

    http://tinyurl.com/2bro57k

    A couple of websites to help you gain a better understanding of antennae
    types.
     
  20. Krypsis

    Krypsis Guest

    I suspect it is. Even a poor analogue signal will provide a snowy
    picture can still be viewed. A poor digital signal will just freeze or
    drop the picture out completely.
     
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