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TV Aerials, HD STBs, HD DVB-T Receivers, SAT TV.

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  • #31
    Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

    Hi Remy,
    Just a thought…TV signals are usually propagated horizontally and therefore the antenna should be horizontally mounted….from the photo you posted it looks as though the antenna has rolled into a vertical position (hard to tell from the photo though)
    Cheers
    Bruce

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    • #32
      Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

      Originally posted by JavaB link=1206260940/15#28 date=1206409747
      Remy,

      Yep looks pretty good!

      Id lose the 4 way passive splitters as YeeZa suggests above...

      They reduce the signal quite a bit..... and when "daisy chained" like yours.... the loss is considerable.....

      A multi-way amplified splitter (with at least the number of outlets required) is definitely the go....

      Id say most of your problem is at the pointy end - the antenna. Direction is wrong, it is too low and check for corrosion, spider nests etc in the balun and also corrosion where the balun connects to the aerial terminals.
      Yeah they are cheapnnasty splitters. About that balun,.. From the ground,. I thought there was a balun there,.. but cant see one in the zoomed in pic. Where would it be? could this be in the roof ? if it is,.. I dont think Im small enough to get to that area. No biggy,.. it might be fine anyway,..and Ill do all the other things I need to do first anyway.

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      • #33
        Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

        Remy,

        It should be right at the terminals on the aerial..... could even look like a slightly larger round connector on the end of the cable......

        Re the "rotated elements" referred to by Billi - some locations use vertical polarisation for VHF stations (the large elements) and horizontal for UHF (the small elements)..... so that part of the aerial is probably as it should be.

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        • #34
          Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

          Originally posted by Billi link=1206260940/30#30 date=1206411018
          Hi Remy,
          Just a thought…TV signals are usually propagated horizontally and therefore the antenna should be horizontally mounted….from the photo you posted it looks as though the antenna has rolled into a vertical position (hard to tell from the photo though)
          Cheers
          Bruce
          Thanks Bruce, good point.. in the pic they do indeed look like they are vertical.. so I raced outside to check. But they are still parrallel to the ground horizontal (longer bits are vertical - shorter bits horizontal,.. same as all the neighbors aerials). I will make sure I keep them this way when I adjust it.

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          • #35
            Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

            Originally posted by JavaB link=1206260940/30#32 date=1206411265
            Remy,

            It should be right at the terminals on the aerial..... could even look like a slightly larger round connector on the end of the cable......

            Re the "rotated elements" referred to by Billi - some locations use vertical polarisation for VHF stations (the large elements) and horizontal for UHF (the small elements)..... so that part of the aerial is probably as it should be.
            Aaar ok,.. off to have another look ::grabs binos and heads out in the rain 8-):: Oh yes!! there it is  :.
            [img]www.studioheath.com/images/bits/balun.jpg[/img]

            vertical polarisation for VHF stations (the large elements) and horizontal for UHF (the small elements).....
            Cool.. I didnt know that.  




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            • #36
              Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

              Doing some shopping on the bay that shall not be named,... does this look ok?,...and what about the power source?? does it need one and if so how?



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              • #37
                Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                Remy,

                I think it is a passive splitter but passes power through to the seperate amplifier (generally called a masthead amplifier as it mounts on the er... masthead!!).....

                I assume that from the "all ports power pass"..... so you purchase a masthead amplifier (which gets its power up the coax which the signal comes down) and at one of the outlets you connect the special power box that sends the power up (via this splitter) to the amplifier..... it also has an outlet for the TV at that location.....

                Do I like masthead amps??...... nope!! If you are in a very weak signal area you have to have one..... but otherwise Id avoid them. You are feeding DC up the coax and any moisture etc will cause very rapid corrosion of the joints along the way (similar to car battery terminals)..... You also need to get a quality masthead amp if you go that way - the cheap ones often introduce some signal on the line from the 50hz power supply (which you see on the screen of the TV as a rolling faint horizontal bar)

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                • #38
                  Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                  OK,.. thanks JavaB,.. will keep looking. Could only find a 4way amplified with power source in the DSE online catalogue. Will ring them to see if they have an 8.

                  Just got off the roof,..and have to go back up because my Rapid Wrench that I got for Xmas that fits hundreds of fasteners didnt aaaaaaaaaargh!. The ends of the U bolt prevented access to the nuts the way this wrench works : . OMG.. my heart is still racing.. will wait another 10mins and go again. There is nowhere to hang on. I have to wedge my right foot (which wont go all the way in) between the roof and the pergola and try and balance on that foot while messing with the aerial...the gutter as expected...wont hold jack.

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                  • #39
                    Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                    Yeah, JavaBs on the ball, beat me to it mate.

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                    • #40
                      Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                      Remy,

                      An 8 way splitter is a pretty rare beastie..... the readily available ones seem to only go up to 4 way.

                      The other thing you could explore is an in-line amp (not a masthead one) which has a built in power supply and feed that into an 8 way passive splitter similar to the one you found......

                      Just as long as you arent running power on the coax it should be fine.

                      And I hate working on the roof as well..... many years ago it wasnt a problem but Im not as agile as I used to be!

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                      • #41
                        Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                        take two....failed again... I can get up and turn the aerial... but cannot keep a footing and reach up to the U bolt to heighten the darn thing. Theres just nowhere to hang on. grrrr. Gonna try to take the pole down from inside the courtyard,.. fix on pole at good height from roof, then refix to house. Whaaaaaaaa.

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                        • #42
                          Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                          Yeah, just be careful REMY, we want our CS member count going up not down!

                          Been thinking about it, I think an inline amplifier (which youll need the power supply) with what youve got would do the trick.

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                          • #43
                            Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                            Originally posted by JavaB link=1206260940/30#39 date=1206491234
                            Remy,
                            The other thing you could explore is an in-line amp (not a masthead one) which has a built in power supply and feed that into an 8 way passive splitter similar to the one you found......

                            Oh I should read all the previous posts before posting up :

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                            • #44
                              Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                              Thanks guys,.. well after take two and turning the aerial a tad,.. we have better reception,. but still not great...still one channel missing on my PC tuner and its very poor on the TV... one bar on the reception scale via PC for a moment there,. now none and channel gone again.  

                              Looking at the aerial height in relation to the roof while I was up there,.. I was able to see exactly whether it clears the crest of the roof,..and it doesnt at all atm.  I suspect that even if I move the aerial up the pole as far as I can fix it,.. part of the aerial will still be below the crest of the roof,. those horizontal elements particularly I think will still be below.  

                              Sooooooh,.. since Im going to pull the pole right off the house (which will also give me the added advantage of checking everything over properly without fear of hitting concrete fast..at least not from the top of the roof,lol)...I might as well get a longer pole. Does anyone know where I can get one of these from?

                              EDITED TO ADD: just realised it is the UHF channels that Im either getting poorly or not at all... the horizontals. ;D

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                              • #45
                                Re: TV Aerials, HD STBs, HD DVB-T Receivers, SAT T

                                Originally posted by Remy link=1206260940/30#43 date=1206493316
                                EDITED TO ADD: just realised it is the UHF channels that Im either getting poorly or not at all... the horizontals. ;D
                                UHF is considered to be a LOS (Line Of Sight) frequency range while VHF is over the horizon capable. If the transmitting antenna for the UHF channels is over the horizon to you no matter what you do you may not be able to get a good quality signal. The only thing you can do in that case is increase the height of the pole. Preferably until your antenna has LOS to the transmitter.


                                Java "Once upon a time was a radiohead" phile
                                Toys! I must have new toys!!!

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