All posts by Briantist
Below are all of Briantist's postings, with the most recent are at the bottom of the page.
Norman: The predictions say that you should be using Mendip as an alternative transmitter. You will not get strong enough signals from Hannington.
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lucid: You change http://www.bbc.co.uk/emp/…1576 to http://www.bbc.co.uk/emp/…1576 .
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N THOMPSON: You have a prediction for "marginal reception" of multiplex 2 until switchover on 18th April 2012. Please see Two frequency interference
| ukfree.tv - independent free digital TV advice .
The TV Licence only pays for BBC services.
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ian: Please can you have a look at Freeview intermittent interference | ukfree.tv - independent free digital TV advice ?
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Freddie: I would also advise against writing to your MP to complain, as they are unable to do anything about the laws of physics, in this case the inverse power law - Power law - Wikipedia, the free encyclopedia .
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John Fogarty: Some UK broadcasters add a pre-delay to their VHF output, so that they can align the various packetized digital systems.
However, the BBC do not do this, so the FM/AM signals are "in sync" and the DAB is not.
From memory, the BBC do not do this because the delay is not wholly caused by the digital transmission, but is partly down to the speed of decoding on the receiver and the amount of "buffering" that it uses.
If you have several different types of DAB receiver they will often be slightly out of sync.
Also the BBC provide digital radio via satellite, which has a (slight) delay due to the 78,000 km round trip; Freeview which has a slight encoding delay; WMA online stream which due to buffering is usually behind DAB, AAC (for Flash) which is usually in front of DAB.
Of course, if you want an accurate time signal, the best you can use is GPS as this takes into account Einstein's time dilation effect.
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Brian Springthorpe: What units is your "simple signal finder" calibrated in? From memory the minimum signal level is -80dBm.
As a general rule, the external USB DVB-T receivers usually perform very well. This could be due to being distant from the electrical noise of the inside of a television set or set top box.
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Thursday 10 November 2011 10:30PM
Keith Dean: Sorry for not replying sooner.
It could be possible that your aerial, being direcitonal, is being selective about the transmitter.
The different DAB multiplexes are coming from different transmitters - you might be able to alter the direction a bit so you pick up all the signals.