My Humax Forum » Freeview HD » HDR 1800T, 2000T

HDR 2000T re-booting

(13 posts)
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    pchristy

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    Joined: Dec '17
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    We lost com7 and com8 when the frequencies changed. Funnily enough, I never had any problems with them, despite them being the lowest powered multiplexes!

    It looks as if the Humax has a tuner that isn't very good at rejecting spurious signals, as the TV never shows any issues.

    Many years ago, we had a Philips (analogue) TV that was useless at interference rejection! It would pick up anything, on any frequency and lose the TV signal. Amateur radio, CB, model control transmitters - almost anything would knock it out! We replaced it with a Sony and that solved the problem completely!

    The Humax isn't as bad as the Philips, but it looks as if it is more susceptible to this kind of interference than it should be....

    --
    Pete

    Wed 5 Jun 2019 19:18:19 #11 |
  2. grahamlthompson

    grahamlthompson

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    pchristy - 1 hour ago  » 
    We lost com7 and com8 when the frequencies changed. Funnily enough, I never had any problems with them, despite them being the lowest powered multiplexes!
    It looks as if the Humax has a tuner that isn't very good at rejecting spurious signals, as the TV never shows any issues.
    Many years ago, we had a Philips (analogue) TV that was useless at interference rejection! It would pick up anything, on any frequency and lose the TV signal. Amateur radio, CB, model control transmitters - almost anything would knock it out! We replaced it with a Sony and that solved the problem completely!
    The Humax isn't as bad as the Philips, but it looks as if it is more susceptible to this kind of interference than it should be....
    --
    Pete

    Normally a result of the boxes very sensitive tuner. COM 7 and CM8 are being transferred to a single frequency network, As adjacent transmitters switch to the same frequencies the box has problems with being able to reject the unwanted other transmitters. Depending on where you are simply attenuating the signal may resolve the issue using a TV attenuator..

    Not a box issue rather a issue with your location and the sensitivity of the tuners in your other kit. A new aerial and and new alignment might help.

    Wed 5 Jun 2019 21:25:11 #12 |
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    pchristy

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    Well we do live in a "difficult" location. We can't get satellite as we live close to a wooded hill, and the satellite is below the tree line! In the other direction is Beacon Hill, and although its not very far away, it is obscured by another hill.

    We had a new aerial installed shortly after we moved in, along with a distribution amplifier that incorporates a 4G filter. Initially we used to get drop-outs whenever it had been raining and a car went up the road! So we swung the aerial round to look at Stockland Hill. Then we got drop-outs whenever the steam train passed, depending on the state of the tide!

    At this point I got fed up and re-aligned the aerial myself! I worked, briefly, as an engineer at a TV transmitter many years ago. Admittedly it was a 405-line B&W transmitter, but the laws of propagation haven't changed much in the intervening years!

    My re-alignment got us a perfect signal on every channel, except the BBC SD channels. This didn't bother me as we had them in HD. The problem has only occurred since the frequency change. We now get everything with a very good signal strength and S/N ratio, except the HD channels dropping out for no apparent reason.

    The fact that the TVI filter seems to have solved the problem leads me to the conclusion that there is an intermittent RF source somewhere along the path to the transmitter that is upsetting the Humax on a specific channel (HD). It could be CB, a taxi, police, ambulance, any number of things.

    I do have a spectrum analyzer, but not the time to spend sitting staring at it for hours looking for the source of the problem. The filter seems to have done the job, so I'm happy for the moment.

    I did consider buying a newer Humax, but the reports on the current line-up are not encouraging, with tales of clunky interfaces and other problems. Best stick to the devil I know!

    --
    Pete

    Thu 6 Jun 2019 9:50:09 #13 |

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