Multiplex names, frequencies and power level highlighting
Brian Butterworth published on UK Free TV I have modified some pages on UK Free TV to make it easier to pick out certain types of information:
Multiplex names are now shown with a bright orange highlighter background.
Transmission frequencies and channel numbers have a bright green highlighter background.
Power levels (values in Watts) are now shown with a bright pink highlighter background.
An example of this is:
I shall be shortly extending this convention to all pages.
All questions
In this section
Thursday, 17 November 2011
K
KMJ,Derby8:43 PM
ALAN HILL: Mux BBCA on C53+ is using the former Channel 4 analogue frequency so is able to radiate full power (100kW). The COM muxes however are using frequencies that are also in use temporarily in the Meridian region, so power is restricted to 12.5kW until 18th April 2012, after which the power increases to 50kW. If you are missing signals in the C53-C55 part of the band it suggests single frequency interference around C54, maybe from a VCR or Sky box, or if you have an amplifier on the aerial possible signal overload from Mux BBCA. Also check cables and connectors and try changing the position of any leads connected to the receiver.
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Thursday, 19 January 2012
A
alexp7811:23 PM
Nottingham
Can I pick someone's brain?
I am at NG69GJ pointing to Nottingham.
After a couple of dropouts on HD I looked at the signal indication on my two month old Samsung. Only C21 indicated signal strength 98% but bit error rate of 800 (half the bar is in the red). Other muxes indicated zero errors. Other than the two dropouts there has not been any problem with reception on C21. I thought maybe there was a transmitter fault that needed fixing but now several days later the bit errors are still about 800 just for C21. I tried turning off external boxes (PVR, DVD) and connecting the aerial direct to the TV, no splitter, ensuring well away from other cables e.g. HDMI. The aerial is wideband fitted a few years ago, and proper digital cable - no amp. Same result. I looked here for a frequency map of other use of C21 but the nearest in line of sight is 80 miles away in Wales. The only thing I can think of is another frequency close to 474 MHz being picked up by the aerial in line of sight. Any ideas?
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alexp78's: mapA's Freeview map terrainA's terrain plot wavesA's frequency data A's Freeview Detailed Coverage
Friday, 20 January 2012
Thursday, 26 January 2012
A
Alex Peterson11:31 AM
Thanks Briantist, I've looked at all that.
Channels:
77 stations stored. Each frequency checks out as MUX ONID 233a and NETWORK EastMidlands ID3023. There is only one channel in the 800+ range which is BigDeal as 829 (690MHz), and the old channel as 32 (722MHz) displays that it's old and needs retuning. The new channel is on the same NETWORK as above.
Signal strength:
I am 3 miles from Nottingham Kimberley, but the signal received is comparable to that from the more powerful Sutton Coldfield 40 miles away. The wideband aerial is not high-gain, and there is no booster. I tested with all other equipment disconnected from mains power and also disconnected from the TV and from the aerial. I have a number of aerial Y-splitters (4 inductive and 2 resistive), so applied various attenuations by chaining these. Results:
Number of splitters / Signal Strength / Bit Errors:
0 / 98 / 800 (approx)
4 / 70 / 800
6 / 35 / 1200
To recap: the problem is that only one frequency (474MHz) reports these errors on all four channels (which are the High-Definition stations). All other channels show Signal 100 and Bit Errors zero.
Can you think of any other factor causing this (outside of faulty internal decoding in the TV)?
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Saturday, 28 January 2012
Alex Peterson: Yes, they are listed on the Single frequency interference | ukfree.tv - independent free digital TV advice page.
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