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 T: Eventually, when all Freeview transmissions are DVB-T2 the SD version of BBC2 will be discontinued, so it is reasonable to assume that the HD version will then carry national variations.
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michael^: I suppose really that it is just progress. Funny how there are howls of protest at the thought of DAB radios being redundant, but it is a foregone conclusion that SD Freeview receivers will shortly become outdated and this might be followed by SD satellite receivers!
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michael^: Possibly the second national multiplex commercial could be launched in DAB+ if it takes long enough to be built.
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bob from surrey: If you have a dish it should be connected to a satellite receiver (Sky or Freesat or supermarket supplied brand such as Ross) in order to decode signals received by a dish. A Freeview tuner requires connection to a UHF TV aerial to supply the signals on the correct frequencies that it is designed to receive.
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John: What is the signal strength and quality on C22 compared with say C24 or C25? Select the frequency as if doing a manual tune, but do not press store or save to take readings of the signal being received. If C22 is shown as having lower strength or quality than the other frequencies it could be that the aerial needs slight repositioning to get a clearer view of that particular signal. With regard to interference from switches etc it is advisable to have good quality double screened coax for the downlead and any fly leads to prevent interference pick-up by the cable. Having the aerial mounted for vertical polarisation might prove beneficial, depending on your location, as the COM muxes including C22 are transmitted at 200kW vertical and only 50kW horizontal from Rowridge. If replacing your aerial a log periodic, or a group A yagi fitted with a pcb balun should be chosen for reception from Rowridge. Avoid the wideband models on offer in DIY outlets as these do not perform particularly well on the lower UHF frequencies as used at Rowridge. A good installer should automatically fit the correct aerial type as suggested above.
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peter parker: Is that a daily problem with C60 or one which became apparent today? If the latter the tropospheric ducting forecast for midday today shows a fair chance of ducting in Suffolk, which could result in interference from out of area transmissions. Conditions should return to normal later today.
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Patricia Wild: I'm quite sure that your reception is from Crystal Palace, which is also listed as having no problems. A visual inspection of the aerial if it is outside would be useful to make sure that it is still mounted correctly and pointing in the correct direction ie same as your neighbours' aerials. Otherwise check cables and connectors are in order. Also check the strength and quality of the signal being received on the different multiplexes, say BBC1, ITV, QVC, Sky News and Film4 to give an idea on whether there is a weak signal problem, as suggested by your receiver, or a quality problem, possibly due to impulse interference. Less likely is the possibility of signal overload resulting from over amplification if there are any boosters in use..
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k: Further to the advice given by Les Nicol, you are situated in the overlap of a number of transmitters, which unfortunately share one or more frequencies in several instances. This results in predicted reception not being as reliable as might otherwise have been expected on a number of muxes. Starting with Findon, this shares frequencies with the COM muxes from Hannington. Whitehawk Hill has C56 also used at Horndean, Mendip and Midhurst, also C48 is used additionally at Mendip, resulting in no predicted reception on those two frequencies. Midhurst is shown as being variable due to sharing C56, C58, C54 with Mendip and C50 with Horndean.Your best bet would probably be to try Rowridge, which is transmitted with both horizontal and vertical polarisation. The vertical option is likely to offer the best reliability overall. Use a group A aerial for Rowridge, this will not only give the best gain for the size of aerial chosen on the Rowridge frequencies, but will also pick up least signal on unwanted 4G frequencies.
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Ann: The frequencies that EE are currently using for 4G are among those already in use for mobile phones. They are not part of the former UHF TV band, which is due to be used for 4G in a few months time and has been the subject of wild speculation and scaremongering. Reception from Crystal Palace is really among the least likely to be affected, and your installation might already be fitted with filters which prevent reception of UHF signals on frequencies higher than those used at Crystal Palace. This could also be a factor in the non appearance of Bluebell Hill on your TV when scanning for channels.
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Monday 25 February 2013 9:41PM
> Scholes: The transmitter was off the air due to failure of the public electricity supply. Check that your tuner is receiving the Itv Channel 4 etc signal on C25, just in case it has found an out of area alternative which is now stored instead. Also, if your tuning is correct, check with your neighbours to see if they are also having problems. If they are there could be a local interference problem, or a fault with the transmitter on PSB2.