Welcome 54.196.38.114 *
Adverts help fund 'VK3 KHB' website...

Please click items of interest, thank you.
Navigation
Menu
TV CH.ChartVK3KHBGAK.NET
Page Time
00:00
Local Time
time_is
UTC
00:00




1. What is DiGiTaL TV?

A noise free way to transmit and receive television.
Digital TV is encoded and sent by an analogue carrier wave, known as an RF signal and the Digital TV receiver smarts process the RF signals to retrieve/decode the picture and sound as streams of data. Perfect copies (almost 99.x% of the original source) of audio-visual-text information, limited by the quality of the receivers equipment/set-up. To be stored on hard disk or solid state memory as a Personal Video Recorder for later viewing or viewed immediately on a DiGiTaL TV screen.


2. What is the difference between
a Digital and a RF TV channel?

In the old analogue TV system one TV channel equated to one "Radio Frequency" RF. In the digital system many TV channels share the one Radio Frequency. These Digital TV channels are allocated as "Digital Streams" or "Logical Channel Numbers" and can be Vision and Audio (TV) or just Audio (Radio Station).

Below is a table of Melbourne's Digital TV channels as of November 2015 from Mt.Dandenong, this list would apply to most Australian capital cities except for amateur TV, which may not be active in all capital cities or in your area.



Grey text is for regional areas.
Blue is Community TV services.

LCN
#
.
DTV
Ch
S#
RF
Ch
#
TV
Network
Pixels
SD_576
HD_720+
Freq.
(Melb)
MHz
* 01
02
03
04
05
06
07
08
09
--
11
12
07
--
--
--
06
--
08
--
TEN
ABC
SBS
--
S.Cross
PRIME 7

SEVEN
WIN
NINE
aTV
1080
576
576
-
-
-
576
-
576
576
219.5
226.5
184.5
-
-
-
177.5
-
191.5
446.5
1 01
10
11
12
14
15
11 ONE
TEN Dig.
Eleven
ONE
TVSN
SPREE
1080
576
576
1080
576
576
219.5
2 02
21
22
23
24
200
201
12 ABC1
ABC1
ABC2/4
ABC3
NEWS
D.Radio
Dig.Jazz
576
576
576
576
720
...
...
226.5
3 03
30
.
32
33
34
37
38
39
07 SBS ONE
SBS HD
.
SBS TWO
SBS 3
NITV
Radio 1
Radio 2
Radio 3
576
1080
.
576
576
576
..
..
..
536.5
4 44 32 C31 Melb
tvs Syd.
31 Bris.
44 Adel.
WTV Perth
576 557.5






5 05
50
54
55
56
...
. S.Cross
ONE
TVSN
11
aspire
...
576
1080
576
576
576

Mhz
6 06
62
63
64
65
...
. Prime
7 TWO
7 MATE
4ME
ishop
...
576
576
1080
576
576

Mhz
7 07
70
71
72
73
74
78
06 7 Digital
7 Digital
Digital 1
7 Two
7 Mate
4ME
Racing
576
576
576
576
1080
576
576
177.5
8 08
80
88
...
. WIN
GEM
GO!
...
576
1080
576

Mhz
9 09
90
91
92
93
94
95
08 Nine
9HD
Nine
GEM
Go!
Life
Extra
576
1080
576
576
576
576
576
191.5
none .
100
101
-- Amateur
VK3RTV1
VK3RTV2
.
576
576
446.5
LCN
#
.
DTV
Ch
S#
RF
Ch
#
TV
Network
Pixels
SD_576
HD_720+
Freq.
(Melb)
MHz


3. So what are LCN DTV S# numbers?

The above table shows the Logical Channel Numbers or Digital TV streams are grouped along TV network "Brand Names" ABC, SBS, SEVEN, NINE, TEN, WIN, PRIME etc. Community TV or experimential TV services like 3D TV, are allocated to the miscellaneous LCN "4" Group.

Amateur TV services are NOT considered part of any Free to Air broadcast group and have no LCN, however your DTV receiver may allocate it to the "3" group as "350" or as "9" group "900" or some other number or not at all, as it is an "out of band" TV service at 446.5Mhz. TV Band is 170-230Mhz and 520-680Mhz. To receive aTV you'll need to manually scan by frequency (not channel) if your receiver allows. Also if aTV is available in your area and the service is transmitting at the time you do a manual scan, that your TV antenna can collect enough of the low power aTV signal for your receiver to decode. Most receivers do not cover or are deaf at the aTV frequency, a dedicated high gain UHF antenna or RF amplifier may be needed or you may be lucky enough as many have found to pick up aTV.

The LCN / "DTV Ch S#" is a number to identify the specific Digital TV Stream, which usually reflects the TV network identifier or a Logical Channel Number group, this is set by the transmitting station and can be any number (0-999).

The "RF Ch#" is the Radio Frequency of the "free to air" channel number (0-69) as set by Australian Communication & Media Authority (ACMA). This channel number has a specified frequencey that your DTV receiver will try to find automatically and decode all available TV / Radio channels with in that RF channel.

This is where it can get confusing; a "channel" can refer to both a Radio Frequency channel (0-69) and a Logical Channel Number or Digital TV Stream channel (0-999). The numeric overlap, 0-69 and a misconception that every channel number has its own frequency.

Several DTV Channels or TV brand names can share one frequency e.g GO! GEM, Extra are part of the NINE network, so you'll need to know the TV Station's RF channel number to manually input if your DTV receiver can not work it out.

Manual input may be required when you first get your new Digital TV receiver, as the initial power up (out of the manufacturer's box) tries to scan all the TV bands as frequencies or channels to find all active TV stations for your area. If the station is not sending or your reception is poor, then your TV receiver can't find all the services.

Only a rescan or manual input of the frequency or RF channel number can force your DTV receiver to decode the signals.

i.e. When 3D TV tests on DTV 40 were on, most set top boxes could not detect any service, a manual input for RF channel 35 forced an audio stream with no video to be decoded. Granted not very useful but knowing the RF frequency was informative to verify your TV receiver capabilites. 3D TV died as the technology was not commonly available, special glasses were expensive and watching with glasses is not comfortable. Something Virtual Reality technology may suffer from.


TOP OF PAGE
Adverts help fund 'VK3 KHB' website...

Please click items of interest, thank you.


4. Digital TV standards MPEG & H.264

Microcomputers inside your DiGiTaL TV receiver obtain TV pictures and sounds like an Internet file download, except any unrecoverable errors are ignored, as the next signal frame has the updated information. The protocol or format used to en/decode audio-visual-text needs to keep the bandwidth of each channel as small as possible without loss or degredation. As microprocessors increase in number crunching power and efficient energy consumption, more process intensive algorithms can be used. Mpeg an industry standard is an efficient algorithm. H.264 is newer and even more efficient at bandwidth usage and error recovery, allowing more standard definition channels or higher definition channels to occupy the same space.


5. The future of "Free To Air" TV.(it is doomed)!

For branding purposes TV marketeers are either pushing the digital stream number as the "channel" number or a "name". Conceivably the "name" can be transplanted to a different TV network if the need ever arises or becomes a dedicated digital stream your smart-phone/device can access via the internet directly

As TV networks sort out what things viewers want to watch and what advertisers or other entertainment providers see as worthwhile audiences to flog products and services to. You can expect more dubious programme content and hype on how wonderful TV is.

Sadly as the content becomes more violent, immature and down right disgusting, sensible people will switch over to internet streamable services or purchase programmes directly from the producers.

Streaming and direct purchase content is a marketing gift as these type of services are more accurate at who & how many and when you are watching, just see all the online-services popping up to see who watches what when.

As the human herd moves from one medium or stream to another, so do the crazy advertisers and greedy grubby 'money is all that matters' organisations, pushing ever more silly, insulting, attention grabing content to interupt your viewing pleasure.


I hope this helps you to understand some of the aspects of DiGiTaL TV and why it is not as straight forward as it could have been. The ever pressing need to make money from "what you like viewing" as entertainment or information will make life interesting, if not frustrating.


Want more information?
visit wikipedia

73
Gary, VK3KHB


Processed in 0.0529 seconds to
> ec2-54-196-38-114.compute-1.amazonaws.com <

File name: dtv-chnls.html - Size:14140 bytes
File updated: 2018.01.13 07:01:48 UTC FST
File viewed @ 2018.07.22 03:02:23 UTC SPT
File request:# 32660 since 2008.07.01...
Site request:# 744719 since 2008.07.01...

Viewport [...] x [...]
_Window_ [...] x [...]
Resolution [...] x [...]
Colour Depth [...] bits
Pixel Depth [...] bits

Mouse Y (...) X (...)
Local IP ::::::
Browser: _ _ _ _
Other? ...