All posts by KMJ, Derby
Below are all of KMJ, Derby's postings, with the most recent are at the bottom of the page.
Anne-MarieMcCormack: What is your postcode? (So a check can be made for what you should be able to receive). The installer should really have told you if some channels are not currently available, but will be after switchover stage 2 on 22nd June 2011.
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Graham Ellery: The problem is Craigkelly overlaps coverage with Durris to the North and Darvel to the West. All three transmitters have the PSB muxes in group A as were the original analogue services. Darvel and Durris now use C22, C25 & C28 for PSB muxes and C23, C26 & C29 for the COM muxes. The Black Hill and Craigkelly service areas sit between the areas served by the Darvel and Durris transmitters. If Craigkelly had used the same group A frequencies for the COM muxes there would have been problems for fringe area viewers in the overlap areas for all three transmitters. Durris incidentally could not continue to use the temporary frequencies that the COM muxes had "borrowed" as these will be used at high power from Black Hill from DSO stage 2. With regard to the power of the COM muxes, it is the case that these are transmitted at half the power of the PSB muxes at most sites. Only the biggest main stations (Black Hill in Scotland) and some former relay sites use the same power for all muxes.
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Ann Tait: If analogue reception has deteriorated to the point that the text services no longer work it is doubtful if digital reception will be acceptable. Is it possible to check with a neighbour to see if they have good analogue reception? The Digital UK postcode checker predicts 100% reception for that postcode, so I would suggest having the aerial, cable and connectors checked. Are there any trees in leaf growing in the signal path? Also if there is any amplification on the aerial make sure the power supply is powered up.
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Bob W. NEW7 does not exist at present, if it ever will. The whole question of local tv services is still under discussion, there is serious doubt as to whether it would be viable.It is also worth noting that in the event of additional services becoming available they would be transmitted at much lower power than the other muxes, and targeted at specific areas. The gain curves for tv aerials show a K band peaks around C52 so would be better than a wide band aerial of similar size for receiving NEW7 if it did become available in your location.
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Graeme: Craigkelly is completely independent of Black Hill and is transmitting the full service since DSO step2 completed. Did you do a factory reset to clear the channel list before scanning for channels? Try a manual tune for each of the frequencies for the COM muxes, your receiver might be overlooking them due to the signal strength being less than that on the PSB muxes.
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Lisa: The map at the top of the page is the coverage area for the Sudbury transmitter. Note that until mid 2012 the COM muxes will radiate at reduced power, so coverage will be less than that shown until full power is available. If you pop your postcode into the Digital UK postcode checker, (tick the trade box) you can see how reception on each mux will vary over the next year.
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Graeme: It is certainly odd, I could have understood signal quality going down with increased transmitter power if the signal was subject to reflections. It is possible that the radiation pattern is different with the high power signals if any protection has been incorporated for Chatton and/or the Perth relay. The solution might be to reposition the aerial if it is now sitting in a null for the signal on the COM muxes. As you say, there are several posts mentioning problems with the reception of the COM muxes.
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Bruce: The Digital UK postcode checker does not offer a prediction for C39 at present, in 2012 reception becomes variable. Similarly C42 and C45 are shown as variable with a very slight improvement in 2012. It is possible that the problem is interference from the analogue transmissions from Chatton, which are shown on a service area map to deliver a low level of signal in an area to the West of Penicuik. The slight improvement to reception of the Craigkelly COM muxes would coincide with switchover at Chatton. An alternative transmitter for the COM muxes at your location is Black Hill. Use a group B aerial for best results from Black Hill.
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Dee: The problem could be single frequency interference. Check that you do not have equipment such as a VCR or Sky box with the RF modulator set around C45. Check that cables and connectors are in good order. Another possibility is that during a scan a signal from Caradon Hill on C24- was found and the channels stored, the stronger signal from Plympton being ignored as a duplicate.If this is the case do a factory reset to clear the channel list and rescan or enter the Plympton frequencies manually to store the correct version of all the channels.
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Wednesday 15 June 2011 4:45PM
George Lindsay: Yes. Only equipment which supports DVB-T2 is able to receive Freeview HD transmissions. "HD Ready" means able to display an HD picture when connected (via an HDMI lead)to an HD source such as a Blu-ray player, Freeview HD, SkyHD, Freesat HD or Virgin Media HD box.