BBC High Definition test card
Brian Butterworth published on UK Free TV If you have a HDTV with Freesat or Sky HD, you may need to adjust your set or amplifier to get the best possible HDTV picture.
The BBC HD channel now provides a testcard and audio signal to help you do this, see A Christmas Present from the HD Channel! BBC Internet Blog.
But, as they point out, DO NOT leave the test card on screen for more than 2 minutes if your screen is less than three months old or more than 5 minutes on older screens. Make sure you go back to the promo for several minutes before using the test card again.
Help with High Definition?
| Whenever i watch moving sport especially football I experience much poorer pictu | 1 |
In this section
Sunday, 23 December 2012
Peter
5:08 PM
5:08 PM
Brian:
I believe it was a widespread myth for a while that transmissive displays like LCD weren't subject to burn-in - or rather image persistence, as it should more accurately be described - but in my view it would really be more precise to say that they are less subject to burn-in, as the words on the whole in the last line of your kind response imply.
The effect with LCD displays is similar in appearance to CRT burn-in and is the result of the constant voltage produced by a static image causing the crystal voltage-response curve to change, which results in them letting more (or less) backlight through when compared with surrounding pixels. OK, technically its not burn-in but the effect, which can occur after just a few hours, is very similar.
There are several things you can do to effect some sort of cure for image persistence (just Google!) but at the end of the day prevention is better. Whilst screen dimming will help reduce burn-in with the old CRT displays, dimming or darkening an LCD backlight won't help preserve your pixels!
| link to this comment |
Sunday, 24 January 2021
D
Des2:21 AM
Please send latest transponder frequencies from the Sutton Coldfield transmitter West Midlands. Thank you
| link to this comment |
C
Chris.SE6:28 AM
Des:
I assume that you mean all the correct UHF channels for the Sutton Coldfield transmitter.
All the multiplexes (groups of TV programmes) are on C43, C46, C40+, C42, C45, C39+, C55, C36/C48 that's in the multiplex order BBCA/PSB1, D3&4/PSB2, BBCB HD/PSB3, SDN/COM4, ArqA/COM5, ArqB/COM6, COM7 and Local L-BRM.
If you need that actual frequency to tune to, just hover your mouse over each of those channel (C) numbers.
See Channel listings for Industry Professionals | Freeview for which TV programmes are on which multiplex.
| link to this comment |
Select more comments
Your comment please