All posts by KMJ, Derby
Below are all of KMJ, Derby's postings, with the most recent are at the bottom of the page.
Sara: When you retune, does this restore stable reception, or does the problem persist? Which channels/muxes are giving trouble? It is worth checking that the channels being stored are on the correct frequency for the transmitter that the aerial is pointing to. The Digital UK postcode checker shows that reception is possible from more than one transmitter, in particular you could have channels stored from Sutton Coldfield with the aerial pointing to Sandy Heath, or for that matter S/H if the aerial is set on S/C.
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Micahel Cole: If reception of ITV3 was fine before the retune it rather suggests that you might now have the SDN mux stored from a different transmitter to the one your aerial is pointing to. Looking at the predicted reception it could be that Belmont (C30) has been selected instead of Bilsdale (C43) as the signal arrives at an angle of about 40degrees from behind the aerial. The TVs receiving from Emley Moor are less likely to have a Belmont signal present as Belmont is at 90 degrees to Emley at your location. It might be necessary to do a manual tune on each of the Bilsdale frequencies to store the correct set of channels on the TV intended to receive Bilsdale.
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Stephen Blanchard: You need to connect the upstairs TVs to a UHF tv aerial in order to receive digital signals that the inbuilt Freeview tuners are able to decode. The Sky box receives signals transmitted on a much higher frequency and picked up using a satellite dish. If the Sky box has an inbuilt RF modulator it will output an analogue signal which can be received by TVs with an analogue tuner. This facility allows the channel being watched on the Sky box to be displayed on suitable TVs in other parts of the house when they are connected to the "aerial out" of the Sky box.
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Mr t: To receive the COM multiplexes (Film4, QVC. Sky News etc) you need to be able to receive signals direct from Divis. A group "A" aerial set for horizontal polarisation (and pointing to Divis) is required, assuming you have no local obstructions in the signal path. HD transmissions are available from all UK TV transmitters. To receive these you need a TV or set top box which supports DVB-T2 transmissions. A receiver sold as "HD ready" will normally require the addition of a Freeview HD box.
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MEM: Try entering 12C manually then move the radio around until a signal is showing then select store. You are not too far away from Clermont Carn, but it does depend on what hills are blocking the signal path. As you say, a more powerful transmitter would help too but DAB generally is somewhat underpowered if it is to match reception on FM. Are you able to receive the FM services from Clermont Carn OK?
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Chris: The problem is not the age of the box, but the fact that the BBC services have been transfered from a Europe wide beam to one which is focused more on the UK. Depending where you are in relation to the footprint of the satellite will determine whether a larger dish will restore reception of the missing channels, or whether it is no longer possible to receive them at all.
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Bryan: The most likely scenario for problems from 4G signals is a weak Freeview signal being received in an area with a strong 4G signal. If the Freeview signal is then amplified with no steps being taken to reduce the level of the 4G signal the viewer will end up with a super strong 4G signal which is likely to overload the tuner. The problem is worse for viewers receiving C60 or C59 as filtering becomes more difficult. I don't know where the nearest 4G antenna will be in relation to your location, but as you are close to Sandy Heath, so unlikely to have any amplification and receiving frequencies away from those to be used for 4G you will probably have no problems to contend with.
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Michael: I would guess that Crystal Palace comes to be mentioned due to the large number of viewers served who will be using communal aerials. Problems could arise when a weak Freeview signal is accompanied by a strong 4G signal. If this combination is amplified with a wide band distribution network there is the possibility that the resulting very strong 4G signal could overload the tuners in viewers' receivers. As you say the CP uses frequencies below C37 which makes filtering easier. Some viewers will need to use group "A" aerials to concentrate the gain on the required frequencies and good quality double screened coax to minimise unnecessary pick up of the 4G signals.
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kevin rose: I have just had a look at yesterday's chart from the William Hepburn's Tropospheric Ducting forecast and it shows that the Inversion effect could be responsible for your loss of signal.
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Wednesday 7 November 2012 1:59PM
Edwin Raymen: To be able to give any advice based on the predicted reception it is necessary to know your location, preferably a postcode for your block or a nearby shop. You say that reception is poor in the early evening, is that all the year round, or does the problem time change to coincide with nightfall? Transmitters normally radiate at full power at all times, unless engineering work is taking place, in which case full power working normally resumes at the end of the engineers' working day which is typically between 4pm and 6pm. The exception to this is when antenna work demands that reduced power is maintained for the duration of the work. Has your aerial installer been on site at the time that the reception problem is encountered? Also does the problem affect all channels or just those on one particular multiplex?