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HDTV talk - antenna and reception issues [consolidated]

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Old 05-12-2013, 10:37 PM   #1
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HDTV talk - antenna and reception issues [consolidated]

This thread is for all discussion on using your High Definition TV (HDTV) including info and tips on:
- antenna talk
- set top box talk
- reception issues

For matters related to the new DVB T2 please refer to this thread:
Digital TV (DVB T2) in Singapore [consolidated] - www.hardwarezone.com.sg

This thread will replace the older thread:
HDTV, Digital TV and antenna discussion thread [consolidated] - www.hardwarezone.com.sg


Some useful info on antennas:
http://forums.hardwarezone.com.sg/82352103-post559.html
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Last edited by petetherock; 30-12-2013 at 08:22 PM..
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Old 05-12-2013, 10:40 PM   #2
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Taken from an older post:

1. DVBt is much much clearer than Analog transmitted tv signals no ghosting what so ever even if signal strenght is only at 22% you still get crystal clear picture unlike analog signals just as long there is signal for the TV to detect and quality dun go below 50% where picture starts to pixilate.

2. DVBt like analog is transmitted over the air and on UHF frequencies, HD5 is 610Mhz while the rest is 538Mhz.

3. Those staying in HDB and connecting through SCV point and want to receive digital 5, 8, CNA & HD5 sorry you need a digital set top box if not you just getting a normal one without digital capability. Dun know more as I dun have SuckHub or Milo TV.

4. For those that plug into the wall socket that connects to HDB rooftop antenna probably gonna be disappointed as I believe the roof top antenna isn't optimise to receive Digital TVs unless HDB decides to spend on upgrading them which I feel is a long long wait unless is new estate.

Ok for those staying at HDB and want to receive DVBt you need a powered UHF antenna that is rated to receive frequencies up to 1000Mhz / 1Ghz the higher the frequencies it is rated the better and you good to go. For those that want analog also and don't want to walk up walk down pressing that bloody A/B switch go buy a VHF/UHF mixer ~$15 at UF technology at SLS, please dun use a splitter, splitter is splitter while mixer is mixer and you get to watch both digital as well as analog Okto, U, Vasathan, Suria etc etc. How to connect very simple self explanatory once you get the mixer quite idiot proof. VHF to VHF, UHF to UHF sockets. Suria, normal 5 n 8 is VHF, Okto, U, TV3 is UHF.

For those advanturious you can build the DB4 HDTV ant seen on youtube - trust me it works I built one myself but please use RG6 75ohm coxial not older RG59 75ohm ones thats the reason I was getting massive signal lost and also throw in a signal booster for better signal strength again self explanatory once you get the thing idiot proof ~ $16 buy at SLT the electronics component shop on the right once you enter the building can't remember the shop name.

REMEMBER that it all depends on location on where you stay if your block is low and has many many other HDB that is much much higher that block you than you may not receive anything at all go KPKB to mediacock to increase signal strength.

Ok this is all I know and what I did to receive my DVBt and analog TVs.
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Old 05-12-2013, 10:40 PM   #3
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Building one:

I have made one out of parts bought from Sim lim as well for 8 bucks.
Here is the proof of concept video that it works for Singapore HD5.

DIY Antenna for Watching Singapore HD5 - YouTube

Instruction to build.
Fractal Antenna for HD + Digital TV - YouTube

P.S. if you want a switch for SCV Point and HD Antenna you need this.
http://www.walmart.com/catalog/produ...ct_id=11600138
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Old 05-12-2013, 10:41 PM   #4
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Previous threads and discussions:

HDTV Tuner Setup and Reception Issues - www.hardwarezone.com.sg

iDTV (integrated DVB-T tuner) - www.hardwarezone.com.sg

Hd5 and mediacorp digital channels - www.hardwarezone.com.sg

TV antenna discussion thread - www.hardwarezone.com.sg
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Old 05-12-2013, 10:41 PM   #5
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HDB antennae:

www.hardwarezone.com.sg - View Single Post - Hd5 and mediacorp digital channels

There are many different types of hdb antenna. Those old HDB blocks with unfiltered antenna will be very good for HD reception. If you can receive the indonesian channel from your hdb antenna, then you will have very good chance receiving hd5 perfectly.
2nd type will be filtered hdb antenna. Those antenna had some frequency jammer to disrupt those indonesian / malaysian free to air channel. You won't be able to receive hd5.
3rd type will be SCV installed antenna. Again, there are frequency jammers to disrupt signals. HD5 is not possible.
My block is using this 3rd type antenna.

Answering to the above post, there are differences between using booster powered antena vs normal antenna. If I turn off the power, I can't receive the HD5. But if I turn on, I'm able to receive it. And I'm using PCI DTV card btw. Last time I run some application that able to detect the signal quality of the DVB-T, and a good quality booster powered antenna really make the difference.
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Old 05-12-2013, 10:42 PM   #6
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This will change with the new DVB T2.
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Old 05-12-2013, 11:27 PM   #7
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Quote:

There are many different types of hdb antenna. Those old HDB blocks with unfiltered antenna will be very good for HD reception. If you can receive the indonesian channel from your hdb antenna, then you will have very good chance receiving hd5 perfectly.
2nd type will be filtered hdb antenna. Those antenna had some frequency jammer to disrupt those indonesian / malaysian free to air channel. You won't be able to receive hd5.
3rd type will be SCV installed antenna. Again, there are frequency jammers to disrupt signals. HD5 is not possible.


I remembered someone suggested the above post be removed because there was no such thing as frequency jammer.

Indeed, frequency jammer belonged to the cold war era, but filtered hdb antenna is an apt description.

I had explained why filter was necessary as shown below:

Quote:

This post is to address the question of whether filter is used in the design for the rooftop antennae, common known as Master TV Antenna (MATV).

In this discussion MATV refers to the whole system while antenna (singular) or antennae (plural) refers to the metal element assembly only.

For simplicity, consider a MATV catering just for Chan 5 and Chan 10 (TV2). The antenna for Chan 5 will be pointing towards Bukit Batok, which is where the transmitter is. For TV2, the antenna will be pointing towards JB.

The Chan 5 antenna is receiving, at the same time, Chan 10 signal. But the quality may be poor, containing a lot of ghosts. Similarly, TV2 antenna is receiving good Chan 10 signal but poor Chan 5 signal. Now if the outputs from these 2 antennae are simply fed into the amplifier without processing, the amplified output will contain poor quality signals in both Chan 5 and TV2. It is necessary to filter out weak and poor signals from antennae so that only clean and good signals are fed into the amplifier.

So, in this particular example, only Chan 5 and TV2 signals will be available through the MATV.

In the case of HDB MATV, the design cater only for local TV stations, TV1 and TV2, no signals from other transmissions will be available. If one can receive other stations, that is because of strong ambient signals resulting in good direct pick up. These don't come from the rooftop antennae.


Update: HD5 from starhub is now possible if one has a tv set or usb tuner or pci/e card with dvb - c.
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Old 05-12-2013, 11:43 PM   #8
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Old 05-12-2013, 11:45 PM   #9
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This will change with the new DVB T2.
Update:
  • TV1 terrestrial now on UHF Chan55 743.25MHz
  • Chan 5, 8, and CNA (dvb-t) moved from 538 MHz to 610MHz
  • TV Mobile discontinued
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Old 06-12-2013, 12:12 AM   #10
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Update by Astrometa on their USB DVB-T2 tuners available on ebay:
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Old 06-12-2013, 07:56 AM   #11
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Building one:
markasong1 wrote:

I have made one out of parts bought from Sim lim as well for 8 bucks.
Here is the proof of concept video that it works for Singapore HD5.

DIY Antenna for Watching Singapore HD5 - YouTube

Instruction to build.
Fractal Antenna for HD + Digital TV - YouTube

P.S. if you want a switch for SCV Point and HD Antenna you need this.
http://www.walmart.com/catalog/produ...ct_id=11600138

The walmart link is no longer valid, anybody have another link or the brand/model of this product, please? Thanks.
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Old 06-12-2013, 10:40 AM   #12
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Update by Astrometa on their USB DVB-T2 tuners available on ebay:
Not much of a reply to your question isn't it? Just beating round the bush.
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Old 07-12-2013, 02:31 AM   #13
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Not much of a reply to your question isn't it? Just beating round the bush.
Ya loh loks like blame assignment exercise to me
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Old 11-12-2013, 01:37 PM   #14
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Went to UF technology, they said they don't sell the antenna mixer....
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Old 11-12-2013, 06:57 PM   #15
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Went to UF technology, they said they don't sell the antenna mixer....
These mixers won't work



On the other hand, this type, or the normal starhub splitter MAY work


IF
  • There are no chan 27, 29, 31 in your normal signal feed from starhub or matv out

Do note use of this splitter/combiner (mixer) will introduce a loss of at least 4dB. If the indoor antenna is already not receiving good signal, the chance of success is also poor.

AND if you are already receiving chan38 DVB-T broadcast without indoor antenna, the chan 38 signals from the two sources may interfere with each other.
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