Question: How to install rooftop antenna
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How to install rooftop antenna


This is a discussion on How to install rooftop antenna within the DTV | HDTV Reception and Antenna Discussion forums, part of the Over-the-Air (Antenna TV) category.

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  1. #1
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    How to install rooftop antenna

    Hello everyone:

    i just purchased the rooftop antenna and well this not came with instructions of how to install or the needed things to secure to the roof, in fact just come the antenna in the box and nothing else.

    i wish to know what things i need to install an rooftop antenna in the roof or to an wall, i been looking up in google but not get any website that be straightforward and just the sites that found made refererence to the simple part of secure the antenna to the mast.

    yesterday i did test of location in the second floor in a place where have partially LOS till the San Cristobal Hill, the channels works ok, except by the channel 28 at the frequency 557143 that according with Chilean websites they are working in a low power broadcast, it is possible get that channel without problems even if they use low power to broadcast?

    according with my location test is 3 possibles locations where can get not problems and one with problems, locating the antenna with the largest element pointing to the transmitter that position cause problems with the channel 28 , the others locations just works fine .

    have another question about amplifiers and pre amplifiers, for what can be used an pre amplifier and an amplifier, and is there Db numbers mean more amplification or more noise added to the line ?


    well any reply will be appreciated


    best regards


    Francisco

  2. #2
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    If the antenna is not too big, you could use a J-pipe to mount it:


    You can mount it on the roof - if it's a shingle roof, or something you can drill into (will not work with tile roofs) or attach to the side of the house at the peak.

    If you have a chimney, or a STURDY pipe coming through the roof, there are strap - type mounts you can use:

  3. #3
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    my house does not have chimney or a studly bar coming from the roof, so i think will put in a roof, well the roof is of aluminium corrugated panel, and well my idea was install the mast in horizontal way sticked to the wall, but too i was thinking in use a curve mast from give the elevation,

    that is my antenna, is a logarithm one
    copy of image ant.jpg

    well looked smaller when i saw it but is kinda compact, is a question too, in the only thing that comes a photocopy of instructions, just said the illustration that the elements should be directed to the transmitter but in the position that i s in the couch the smallers ones to the transmitters to me is weird because i have always seen those antennas in the position normal that are always.


    just i do not understand maybe those Chinese just are wrong.

    well

    best regards

    Francisco

  4. #4
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    Francisco,

    Since you have a metal roof, you need to elevate your antenna at least 8 feet above it and even higher is preferred. Your roof is an unpredictable reflector and you want to get your antenna as far away from it as possible.

    I have to wonder about that antenna's design: it looks like a dedicated single channel Yagi with a non-related driven element (too much longer) and a completely unrelated reflector (WAY to long). What is its manufacturer and model number? I want to look up its' specifications. Best regards and good luck,

    Jim

  5. #5
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    manufacturer T.com company Antena de Balcon (balcony antenna)
    specifications data unknown the label says only for urban areas, distance to transmitter not major than 20 KM, 12 miles, mi house is at 8.9 KM far away from the transmitter (5,6 miles)
    Capturate channels from 2-50 and FM signals

    characteristics only can work in urban areas, water resistant sun and wind, high resistance holder can be used in two positions

    design of elements multiples in cross phase

    and say an example in Maipu town (Santiago) only will get an excellent reception of image the departments that have windows or balcony at noprth or west area because can be installed pointing to the San Cristobal hill where is the transmitters located.

    i was watching an formula to get the gain value but looks like ridiculous 0.008 of gain

    of anyway all seem that have to use an mast of 2,4 meters of height


    the single channel Yagi is good or bad? in my case in the test in the first floor location does not work fully, only if put in the second floor ok best said at 4,5 meters height works.

    but i have an doubt , i do not know if with ATSC happen the same b ut i feel that when have the antenna located in the right place, if i move the coaxial cable start to get pixellated too, even if the antenna is located in the right time, that happen to yours too?


    best regards

    Francisco
    Last edited by scandiskwindows9x; 01-21-2011 at 08:57 PM. Reason: lack details

  6. #6
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    well have a question to do, i got from a site the power that are using for broadcast in digital television now and just have a question, my little antenna would work under too low powers?

    SANTIAGO
    TVN 8 kw
    CHV 1,5 Kw
    MEGA 1,2 Kw
    UC13 1,2 Kw

    LA RED 200w

    the red ones is my major headaches when try of tune it and the purple one, is almost if get a screen is for lucky.

    i also would to like to ask, those powers are like suitable or the best for broadcast in a urban area with buildings and traffics in everywhere?

    any answer would be appreciated

  7. #7
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    Scan,

    Before they received permission from the FCC and were granted permission to bump up to 900 watts ERP, I have always received a station (translator) 19 miles away from me and at the time, they had a barn-burning 40 watts ERP - less than my porch light bulb burns. Receiving OTA is not based on signal strength, but it is based on the quality of the signal received.

    The ERP reports above are similar to what Canada (British Columbia) does to cover local areas. BC is what l call 'translator-happy' and it makes it impossible (so far) to receive those channels here, yet they are less than 100 miles away.

    If you are local to your transmitters, there is a solution for you and I'm sure you will discover it. The best of luck!

    Jim

  8. #8
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    then our system is the worst, with 200watts of power is not able of cover 6 miles of good way, and yours with 40 watts and 19 miles far away could get a signal of low power, then all seems that my predictions about our big mistake of follow to Brazil decision in the DTV system election was right, and the winner already was the ATSC system.

    no really i did test and the 200w of power are not able of keep a video signal running by up of a minute is this channel intermittent, so that is not up of me, is up of the television broadcaster and government, i can not solves everything by purchase more stuffs for solve things that i have predicted even before than the past year decided the system that we would use.

    so i do not know if would need luck but i know only one thing, this DTV system made in japan and adapted in Brazil is not the good one for a country where is too remote areas to cover.

    for the field test they used just 1watt and the transmitter was located almost closer of the place where they did the test,sounds like cheat

    best regards Francisco

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    Francisco,

    I'm not sure what you are using for an antenna, but have you tried using smaller antennas? I live within a mile of 4, one megawatt TV transmitters so I live in an RF soup. I think that's the reason when I tested several antennas against each other last summer the resuslts were bizarre. The smallest antenna won the shootout.

    If you have local transmitters within 6 miles cranking out 200 watts, I suspect your receiver is experiencing a signal overload or confusing multipath rather than a lack of signal.

    If CB radio and 4 watts ERP can go nationwide and as a Ham radio operator in the early 1970s 70 watts ERP was able to get me around the world, certainly 200 watts from 6 miles away from you at any frequency ought to be enough signal for a decent picture ... but ... is it too much OR are the reflections (multipath) too much for your receiver to decipher? Try a smaller antenna or attenuators.

    Jim

  10. #10
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    well i think yours in america are a bit wrong, the OFDM signals are not better than 8VSB signals have the glitches too, also have multipath problems too, in fact if pass near of the antenna get multipath and gets pixellation, not always is greener the grass in the neighbor garden yours have multipath problems but are solvable, ours is not solvable because is an muticarrier signal is not an signal composed by an pilot signal and over there goes the data and is unpredictable where will caught a carrier to get an signal.

    this is some data obtained from an website of an university

    "La transmisión de una señal mediante múltiples transmisores terrestres en lugares con geografía compleja ( Chile ), conlleva ciertos desafíos en lo referente a la decodificación de la señal, puesto que se generan zonas donde se reciben múltiples versiones de una misma transmisión provocadas por rebotes de la señal en edificios, cerros, etc, o porque el lugar esta siendo cubierto por más de una antena de transmisión."

    "the broadcasting of a signal with multiple terrestial transmitters in places with complex geography (Chile) have certains challenge in reference with the decoding of the signal, because can be generated zones where can be received multiples versions of the same transmission caused by multipath of the signals in buildings,hills,etc, or because the place is being covered by more of one transmitter antenna"

    Esta situación es en parte solucionada teniendo un tiempo de interleaving y por el un intervalo de guarda insertado a la transmisión a nivel de codificación, además de los medios de recuperación de errores desde reed-solomon hasta la codificación del video en h264."


    This situation is in part solved having an interleaving time and an guard interval added to the broadcast to level of coding, also of the ways of errors corrections from Reed-Solomon till the Video decoding in H 264.





    El tiempo de interleaving consiste en re-ordenar los datos a enviar de manera no continua. El intervalo de guarda es un tiempo que se reserva entre tramas de datos empleado para re-sincronizar multiples copias recepcionadas.


    The time of interleaving consists in re order the data to be sent in a way not continuous , the guard interval is an time that is reserved between plots of data used for re-syncronize multiples copies received



    En ISDB-T el tiempo de interleaving va desde 0 a 880 ms y el intervalo de guarda es de 1/8 del tiempo de duración de una trama.


    in ISDB-T the interleaving time goes from 0 to 880 MS and the guard Interval is of 1/8 of duration of the plot




    maybe is multipath but by that is nothing that can be done by myself


    i have tried using an 8 elements weird antenna that i made and that happens and with the antenna that i purchased now,have done some test and just at the first floor no signal and in the second floor can get a good signal, always in outdoors, as far as i know for UHF is just a small antenna needed not those larger of 12 or 15 elements



    best regards
    Francisco

 

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