All posts by KMJ, Derby
Below are all of KMJ, Derby's postings, with the most recent are at the bottom of the page.
Rog: With existing masts at Emley Moor, Belmont, Sutton Coldfield, Sandy Heath and Tacolneston the original intention was to locate a transmitter to cover the parts left unserved or poorly served by these masts. Hence Waltham-on-the-Wolds was chosen as the site best suited for that purpose. Then along came the creation of the East Midlands region - unfortunately there were parts of Leicester, Northern parts of Derby and West Nottingham better served by Sutton Coldfield, whilst North Notts is served by Belmont. I recall the IBA pointing out that an area is considered to be "served" if it was covered by a reliable TV signal, irrespective of which regional sevice was carried by the transmitter. There have been a number of regional correction relays built however to serve parts of East Anglia, North Wales and North Derby!
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Craig: An 18 element group A yagi would probably deliver a stronger signal and with a lower wind loading! Slight repositioning of the aerial might improve reception of C28 ie raising or lowering, or mounting a few inches to either side of the present location.
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Catherine: If you clear the channel list, then decide to do manual tune, you will need to do a manual tune in turn, on C48, C49, C52, C54, C56. This should restore a full list of channels. Poor signal strength on any of the muxes will need to be addressed in accordance with jb38's advice.
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Christian: There have been no changes to the BBC channels in your area. The only mux which recently changed frequency was SDN. If you are unable to receive ITV3, QVC etc, in some instances an adjustment is required to communal aerials in order to let the new frequency through. Regarding the BBC channels, check the 800s of the channel list for BBC Oxford. If you have no BBC channels stored do a manual tune to C53. If you already have BBC channels in the channel list that do not work (ie weak version from Hannington stored) you might have to delete these first before storing the Oxford frequency.
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rob: How did the original aerial perform when set to receive Sutton Coldfield signals? It is quite possible that a 91 element aerial could deliver too strong a signal if positioned where it has line of site to S/C, ie between the houses on the hill opposite (Matlock Rd). The DUK prediction is for excellent reception on all muxes. Try repositioning the aerial slightly, if that is possible , to see if any improvement results.
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Mrs h: The problem is most likely due to the COM muxes from Durris (the transmitter that serves Fyvie) currently sharing frequencies with Knock More. DUK do not make a prediction for reception of the COM muxes at your inlaw's postcode because it is likely that in the event of a signal from Knock More being present it would block reception of the signals from Durris. In practice, it would appear that it is sometimes possible to receive the COM muxes from Durris, but at other times reception is lost. If the services are still listed in the channel list, but signal quality is shown as poor when doing a signal check there is not a lot can be done, unless repositioning of the aerial is attempted and is fortunate in finding a null for the unwanted Knock More signals. If the services have been lost when attempting to do a retune, try doing a manual tune on C23 for the SDN multiplex which carries ITV3. Similarly C26 for Sky News or C29 for Film4 if either of those is also missing.
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lizzie: Check that the BBC multiplex is tuned to C50 from Winter Hill, rather than C26 (Haslingden) or C45 (Moel-Y-Parc). It is possible that your reception is being disrupted be trees in leaf growing in the signal path. What is reception on Sky News like? This service uses an adjacent frequency, so could also experience similar problems. There is very little tropospheric ducting occuring at the present time in the UK, so interference from distant transmitters can be ruled out. If you have an HDMI cable connecting the DVD to the TV try moving its position relative to aerial flyleads in case of any interaction between them.
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Bakatcha: Similar reply. Check that the BBC channels are being received on C49 for Waltham as NG2 also has signals on C43 (Sutton Coldfield), C27 (Kimberley) and C22 (Belmont). I assume that your problem began when the BBCA frequency changed at Waltham. If you are using a communal aerial check if neighbours in the same block are having the same problem. If they are, it might be necessary to contact the landlord or property management company for an adjustment to be made to the aerial to let the new frequency through. If it is your own aerial there should be no problem if you used to receive BBC East Midlands on Freeview before DSO in 2011, as C49 was in use then. Additionally, check for trees in the signal path, Sky box or VCR RF modulator set around C49, or interference from HDMI cable if you use one.
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Saturday 8 June 2013 8:25AM
Adrian: The DUK prediction is for good reception on all muxes from Bluebell Hill and Crystal Palace using a suitable aerial. Firstly is your aerial on Bluebell Hill intended to receive C54? A group "E" or wideband would normally have been fitted for analogue reception, however if your aerial is a group "B", identified by a yellow stopper at the end of the boom, it would be somewhat less efficient at picking up C54. Trees or a tall building obstructing the signal path could also result in C54 being received at lower strength. If the aerial happens to be positioned in a null for C54, slight repositioning (raising, lowering or a short distance either side) might be needed to improve reception. Interference blocking the signal is another possibility, either an analogue signal from the RF modulator of a Sky box or VCR set on or near to C54, or interaction with an HDMI cable, which would need repositioning relative to the tuner or aerial fly lead to overcome such a problem. Check that all connectors are in order. One other thought, if a communal aerial is in use there might be channel filters which require adjustment to let C54 through. In that case the landlord or building management company would need to be contacted after getting confirmation that neighbours in the same block were having a similar problem.