My Thought About An Analog TV Transmitter Cabinet Of GMA-7 Tower Of Power

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There were few many times of publicity when GMA Network—as a non-KBP (Kapisanan Ng Mga Broadkaster ng Pilipinas) member—may have often opposed to adopt ISDB-T DTTV (stands for “Integrated Services For Digital Broadcast-Terrestrial” and “digital terrestrial television”, respectively) transmission on commercial run by 2013 or later year before analog TV switch-off by the end of 2015, since critics from fellow Netizens claimed that the network often have a delaying tactic to cease availability of free-to-air terrestrial digital TV due to not only the continuing loyalty of its proprietary powerful analog TV transmission for their loyal TV audience that still uses low-cost CRT TV receiver set, but also their continuing favor of proposed installation of DTTV platform DVB-T2, which is suitable only on former PAL/SECAM TV assignment on most countries under 8 MHz channel bandwidth and 50 Hz AC power, but not on 6 MHz RF band and 60 Hz AC power currently assigned in the Philippines. Its main competitor, ABS-CBN, TV5, PTV, and other KBP-member TV networks, have often starved for waiting an Implementing Rules and Regulation (IRR) from National Telecommunications Commission (NTC) to use ISDB-T platform from a current limited quality of analog TV transmission. The NTC took a long time to review-and-revise the creation of IRR started in 2009 after choosing ISDB-T platform, on which the purpose of the ruling is to follow proper settings and controls of the said DTTV broadcasting.

But before heating up the competition on which DTTV platform is best suited for the Philippines regarding a given technological innovation, this thought of mine on this blog takes a rewind about the past innovation of old-fashioned analog TV in the world of modern-day electronics, as well as the most secret innovation for analog TV broadcasting application during the age of modern high-tech computers in the early mid-90s until present.

We often familiar about GMA Tower Of Power, a 237-meter analog TV tower built in 1987 with a power of only 20 KW TPO (transmitting power output)—which is enough access over Mega Manila area due to the highness of its structure with the aid of high-gain outdoor antenna for most TV receivers—and further increased to 100 KW TPO in 1999 after replacing from lightning arrester-blinker light-ladden pinnacle to additional mast structure to support more antennas (see below). The tower may often surpass high-rise buildings more than 200 meters in analog TV broadcast mode and it may be compable to install DTTV antennas at the top of its higher tower mast (currently running on its installed blinker light) in the future to become stable in ISDB-T DTTV coverage compared to other TV towers in Metro Manila that would be vulnerable to DTTV signal obstructions, only if GMA would promise to use Japanese DTTV platform rather than the second generation European DTTV platform, which is installed only on towers at about 30 to 60 meters. (However, GMA Network may not often permitted to unite various TV networks to run ISDB-T DTTV channels for Tower Of Power aside from planned future launching of “GMA DTTV”—just as various TV networks in Japan unite together to broadcast over Old Tokyo TV Tower and even Tokyo Sky Tree—due to their self-ruling of “exclusive ownership rights of TV tower”.)

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Aside from the tower, its TV transmitter facility uses a powerful digital component-console controlled analog TV transmitting cabinet installed in 1999. Although, in my thought only, it consumes only (fairly) less electrical power consumption for an intentional generation of higher TPO as a typical “power booster”, the unit converts from MPEG-based digital video chrominance signals coming from DVB-S/S2 DTV satellite relay feed into a specialized high-class, high bit depth pulse code modulation (PCM) digitally-processed analog composite video signal (currently running 525-line NTSC analog TV system) before flowing through high-gain analog TV transmitting antenna.

The console unit generating analog TV signal transmission does not support any form of DTTV platforms such as ATSC, DVB-T/T2, DTMB, or ISDB-T, but instead such of either DTTV system as mentioned may be separated away from that analog TV transmitter unit to another open area to install and run DTTV transmitter cabinet. (GMA Network had only 800 million peso budget to upgrade from their current analog TV transmission to a full DTTV transmission at all GMA TV transmission facilities in Metro Manila and regional areas depending on the favor of approved DTTV platform from NTC ruling. If so, then the GMA DTTV transmission in Metro Manila would be 3 KW TPO and 1 to 2 KW TPO on GMA Regional TV towers.)

None of the web photo clippings nor blog journals were available found on most web search engines like Google, Yahoo! Search, or Bing about the full scene and information of such unit inside GMA transmitter facility, mainly due to the fact that they may not allow for most people, children, or even ECE students as a tourist to take photos on it, since the unit owned by the network remains confidential. Instead, it can be found only on reliable research sources exclusively owned and handled by GMA Network.


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