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When auto tuning my LG LST-5403P dvr I can not get the ABC channels. It worked correctly until my wife decided to go thru the auto tuning process!!! The missing channels can be picked up at the TV but not selected by auto tuning so it is not an antenna problem.

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Hello,

The ABC channels arrive on a different Harmonic than Analog signals; specifically the third Harmonic. When you auto tuned, the auto tune chip looks for stron analog channels on the first harmonic and any other strong signals. However the LG model is notably poor at capturing 3rd Harmonic signals.

Harmonics are different frequencies where the same signal can be captured. Making this overly simplified: a frequency multiplied by 2 is a harmonic and that multiplied by 2 is also of the same harmonic; inversely dividing by 2 and 2 gain and so on finds harmonics down in light wave frequencies.

You may be able to manually tune these ABC frequency channels manually (I do not know, as I live in the US and have no direct experience with this) and then add them in one by one. But, using the Auto Tune feature again will wipe those out. The same thing happens to other weak signals, which harmonic is actually (its on an offset carrier wave).

I just read of a man who built an improved antenna and put this in his attic and received ABC channels quit well. A decent understanding of Antenna physics is required, but it only took up 1.5m wide by .8m (sic) long. In a nutshell he improved his basic antenna by building his own more sophisticated antenna.

Shopping around and asking in the shops should get you an antenna add on that will work for you.

As I stated before I live in the US, and we don't have this, but I and others here at fixya have various experience in amateur radio.

I will ask a friend of mine who lives in Australia to confer with me on this problem of yours so he can add some value to our response to you.

Regards,
Worldvet

Posted on Oct 23, 2008

  • Glenn Rogers
    Glenn Rogers Oct 23, 2008

    Below is the reply from a cohort of mine on FixYa.com who also lives in the AU and his take as a professional electronics technician (he, I and many others on FixYa are burdened with gray hair and receding hair lines, we've been doing this for so long.)

    I would take all this information into mind, print these off, and then begin your 'treasure hunt' for the practical solution to your problem. I believe his suggestion to use Digital mode vs. Analogue mode would make the biggest most immediate change.

    Keep us informed if you don't mind, it helps us all to function better on this web site and at times in our businesses as well.

    [Begin Consult]
    If they are looking for analog ABC, it is low band VHF, ch2 to be exact,where the rest are high band VHF, and needs a decent multiband antenna to get it in a lot of areas, well in Brisbane at least. We have Mount Coot-tha that has a good propagation to most metro areas approx 40km radius, although it starts to get a bit noisy on the ABC due to lowband interference issues. .
    There are many areas of AU that use UHF for TV also. Not enough hills in many parts of the east coast to get the coverage, so there can often be UHF translators that you need to tune onto. I suspect the ABC problem does relate to them not using an antenna that is suited to VHF, saying this of course if they get the other channels (7,9, and 10) ok.

    Go here for a more specific channel/frequency guide to determine if it is the problem by location. ABC is on different channels almost depending on what suburb you are in for some areas. If the DVR can do digital, then they should go that way as it is now UHF ch21. It may be that they are trying to get analog signals, that will be turned of in the near future... so tuning the system in for UHF propagated digital is the way to go.

    Back in the day when I used to do antenna I recommended the Hills PF11 antenna, multiband 11 element yagi with low/high band VHF/UHF, or a PF17 (17 element) with mast head amp if they are in a marginalized signal area. But a UHF array is still the best way to go if they can process a digital signal. Hope that helps :)

    oh and the spurious harmonic auto tune may well be the issue, just that ch2 reception has been poor for so many people over the years, will be good to see it finally turned off!!

    [end Consult]


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