Double posted
This post has been edited by Exa_Bytez: Apr 15 2020, 11:37 AM
Digital TV Malaysia v2, Malaysian Digital Terrestrial TV
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 Apr 15 2020, 11:35 AM
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#1
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Junior Member
369 posts Joined: Jul 2008   
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Apr 15 2020, 11:37 AM
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#2
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369 posts Joined: Jul 2008
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Hi guys, need some inputs here. Please recommend the best bang for buck antenna for 30km distance from tower. Preferably indoor. If indoor not possible, I would prefer outdoor antenna that does not need to put very high on roof. Currently using the indoor paste on the wall antenna. Only able to get 8 channel at best at 666mhz. Even this channels stutters all the time. Weird thing is, when I used with USB booster, no channel detected at all.
BTW, I'm curious on what the difference between 5e aluminium type with jp 5e type. Is signal quality the same? This post has been edited by Exa_Bytez: Apr 15 2020, 11:41 AM |
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Apr 15 2020, 04:44 PM
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#3
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369 posts Joined: Jul 2008
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QUOTE(yongtjunkit @ Apr 15 2020, 02:26 PM) 30KM requires the use of outdoor antenna, indoor antenna maximum can go up to 25KM only OK thanks. Ordered one from shopee just now. Things is, with my paste on the wall antenna and also my DIY antenna, I was able to get >70% strength but 0% quality. What does this indicate. And when there is a picture on TV, the strength is 40% only and quality jumping around 30-50%Using JP 5E + RG6 cable for my aunt’s house aerial even though the distance is 18Km.... https://forum.lowyat.net/index.php?act=findpost&pid=95277281  |
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Apr 15 2020, 06:20 PM
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#4
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QUOTE(yongtjunkit @ Apr 15 2020, 04:52 PM) That means unstable signal(30-50% signal strength considered quite weak already... too low to be useful ) ... for you distance you'll need an outdoor antenna... indoor antenna isn't optimal for your distance I also get 90+ on the signal strength at some point but quality remain at 0. What is the correlation between both? |
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Apr 16 2020, 09:22 PM
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#5
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QUOTE(yongtjunkit @ Apr 15 2020, 06:34 PM) Usually, it's the antenna or wiring issue... I'm 25km from seberang jaya towermaybe what you can do is share us your area(or provide us with the distance from your location to the nearest transmitter), a picture of your antenna and make sure that there's no hobby-grade splicing - refer to the spoiler the quality should be 100% and have a decent and stable signal to receive MYTV signal properly( at least 70% if not mistaken... the higher the better)joshHD might be able to confirm this » Click to show Spoiler - click again to hide... « My ghetto antenna setup is shown below. Without the aluminum cans, my 650mhz channel all stutter. Now still stutter but less frequent.  Previously made one stealth hawk antenna using dawai that can only get signal outdoor.  . Unfortunately the wire that I have right now is not long enough so cannot permanently park this antenna outside to see the true performance. Current setup  My 10mins diy antenna just for a proof of concept.  QUOTE(joshhd @ Apr 15 2020, 09:48 PM) The antenna you're using now, does it has some sort of built-in signal booster? If yes, that could be the culprit. Thanks. I don't think saturation is the case here as I'm quite far away from the tower. Currently I'm using my antenna without booster as I have never once get any picture with it. When Strength reading is high, but Quality is 0%, I guess is because your digital TV tuner (either digital TV box or IDTV) is receiving too much signal (signal overload) until it saturates the signal to be interpreted by the receiver. Or, your digital TV tuner is receiving strong interference from somewhere else (too much RF interference noise), till the point the received signal becomes "hard to interpret" or useless till it can't be read by the TV tuner. Too technical? Ok, it layman terms, try other antenna please, or turn off the booster function. Reason is either the antenna is rubbish, or the antenna is not suitable to use in your location. Btw, what is your area and state? QUOTE(dayojah @ Apr 16 2020, 09:36 AM) If you look at a TV signal with a spectrum analyser, it is actually made up of dozens of carriers spaced out across the 8 MHz channel. So let's say if I manual tuning to 666mhz, the strength and quality should only shown for this specific frequency only right? I observed the modulation portion jumping around 4qam, 16qam. When picture showing, it becomes 256qam.Indoor signals usually end up with some of these strong and some week, so what should look like a neat row like this https://upload.wikimedia.org/wikipedia/comm...ectrum_good.jpg actually ends up looking like a picture of a mountain range. This is caused by reflections inside your house  |
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