All posts by KMJ, Derby
Below are all of KMJ, Derby's postings, with the most recent are at the bottom of the page.
Mike O'Sullivan: After DSO all muxes will be transmitted at 2kW, so yes you should notice a considerable improvement in signal strength. It is possible that the problems with reception on the second TV are caused by interference picked up by the coax if the screening is not very good. If this is the case, replacing the extension with satellite grade double screened cable would show an improvement. If you do replace the aerial, all frequencies will be within group "B" after 18th April 2012.
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Kim V: Could you give more information with regard to which transmitter you should be using, your postcode would be most useful so that a check on predicted reception can be made. If you are using Rowridge remember that it is only the standard definition BBC channels that have switched to high power working at this stage. ITV1&2, C4/C5 etc follow on 21st March 2012 (and HD channels start too).The COM muxes switch to high power working on 18 April 2012. The Wareham area receives rather patchy coverage from Rowridge, Mendip, Stockland Hill and Hannington so it is possible that you might have found signals from a different transmitter to the one that your aerial is pointing to, resulting in unreliable channels being stored.
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ben: If the TV socket is designed to take an "F" connector you will need an adapter which screws on to convert the socket to take a coax plug. You might find that the TV works perfectly when connected to the correct socket.
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D Pritchard: ArqB is currently being transmitted at 1kW, this is planned to increase to 10kW on 25th April 2012. Digital UK show SDN and ArqA to be currently at 10kW, which is the planned "full power" for the COM muxes at the Midhurst transmitter
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Andy: If you point an aerial (group c/d preferably) to Winter Hill you might find that you are in range for reception of all muxes. Have any of your neighbours got their aerials pointing NW, with rods set horizontal?
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Sarah: As DAB transmitters are vertically polarised try holding the wire straight up when scanning for stations. In addition to Exeter, you could also possibly receive signals on the BBC national multiplex from Stockland Hill. Trying a number of locations around Crediton for a reception check revealed whilst some places had robust reception predicted on both BBC and commercial muxes others had a strong signal on BBC only (High Street) and one place (Rookbeare Farm) had no reception at all.
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M.Scottilini: In locations where two or more regions are available it is normal for one of them to be stored in the normal (LCN - "logical channel number") position in the channel list and the alternative region(s) to be placed in the 800s. Some receivers place the first signal found in the LCN position, so C24 from Rowridge which carries South Today on BBC1 is stored in position "1". Whitehawk Hill frequencies are found later in the scan, so C60- which carries South East Today on BBC1 would be stored in the 800s. Some receivers are designed to select the strongest signal for storage in the LCN positions, so in such cases Whitehawk Hill could get priority. Others, usually more recent designs, prompt the viewer to enter a preference when regional variations are found during the frequency scan.
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Keith: Yes, all six muxes from Mendip will be transmitted at 100kW from 28th March 2012.
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Jean: The frequencies of the COM muxes at Rowridge will change on 18th April 2012 as you said. The power increase for horizontal polarised signals will only increase to 50kw however, so these might not be as robust as the PSB muxes, due in part to the COM muxes sharing frequencies with Stockland Hill and Crystal Palace. In order to address this problem the broadcasters will additionally transmit all muxes from Rowridge with vertical polarisation at 200kW. In order to take advantage of the stronger signals viewers will need to turn their aerials so that the rods are vertical. Wait until 18th April, then see what reception is like to see if this is a necessary alteration!
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Friday 16 March 2012 11:14PM
John Langridge: Weather conditions since Wednesday have resulted in out of area signals traveling further than normal due to the inversion effect. Many viewers experienced interference to TV reception as a result. Mux2 is currently predicted to give variable reception at your location, on 18th April 2012 the frequency will change to that currently used by analogue BBC1 and the power increased to 200kW. You are then expected to have excellent reception these channels.