All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
seba672: Point your aerial at the Sandy Heath transmitter, n-ne 27°, you will receive Freeview HD on Wednesday 13th April 2011.
A wideband rooftop aerial is required for reception of all multiplexes from Sandy Heath.
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Mark Agius: Technically speaking these channels show no adverts at all, as "adverts" are "spot adverts" which are paid for by third parties during programmes.
The shopping channels therefore are spot-ad-free.
I kid you not!
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David Haworth: No, your technical advisor is incorrect.
The BBC HD channel on SATELLITE and CABLE is in Dolby AC-3 format, which is true "5.1" in that it carries six separate sound signals.
This has OUTBAND signalling, so it will be activated automatically, as long as you have used SPDIF to connect the box to the amp, or HDMI to the TV with 5.1.
On FREEVIEW the BBC HD channel is stereo.
What happens on a 5.1 system to a stereo signal, and it doesn't matter if it SPDIF, HDMI or plain old dual-phono, depends on the buttons you press on the remote, as there is no INBAND or OUTBAND signalling.
If you select Dolby PLII (Pro-Logic II) the stereo source will be processed into left, right, rear left+right, center and sub. This is done by a mixture of filters.
The rear is created by the phase difference between left and right, the sub (the .1) is done from a low-pass filter. The centre is done from a mono mix of the vocal range and what's left gets put into the left and right.
If the BBC only provide 2.0 on some programmes, and they will do that when there is no 5.1 source available, then you must decide what you want your amp to do.
Most of the processing options for 2.0 to 5.1 have flaws, which is why there are usually SPORT and MOVIE and MUSIC and SPEECH options somewhere to choose from.
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...you should generally only use the PLII settings for programmes that were "encoded" in that format. It will make other things sound strange.
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Tom Fletcher: There certainly is no such thing as a "digital aerial". The "digital bit" of the transmission is the COFDM encoding.
COFDM was designed to work with the existing aerials. The digital multiplexes broadcast in the same "channels" as the analogue UHF TV channels.
The main confusion has arose because the digital transmissions were so weak, as they used gaps left in the analogue frequency plan to prevent co-channel interference under "Inversion" conditions.
Therefore a selection of aerials were provided that performed better under these conditions, for people on the fringes of reception.
Remember in the ONdigital days, the output of most digital transmitters was at least half of what it was before switchover.
But the signal that comes of the dipole from any Yagi aerial is just a signal. Until you stick it into a receiver and try to decode it does it become digital.
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odgie: I'm not sure if an aerial would help, but I can't say for sure without a full postcode.
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Andy: If you can get Channel 5 on analogue, you should be able to get Freeview HD, but you are just on the edge of where this is possible.
Can you check the Single frequency interference | ukfree.tv - independent free digital TV advice page to ensure you don't have a problem there. Freeview HD is on C34 on the Lichfield transmitter.
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william: Please see Single frequency interference | ukfree.tv - independent free digital TV advice , and Wednesday 21st September 2011.
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Monday 28 February 2011 7:25PM
The dish itself is a waveguide, only the end of the lnb is an aerial in the technial sense, surely?
If there were a style guide I would ventuee that a yagi is 'an aerial' to the public and a dish is 'a dish'