All posts by KMJ, Derby
Below are all of KMJ, Derby's postings, with the most recent are at the bottom of the page.
Terence O'Rourke: Sounds like single frequency interference. The current weather conditions are enabling signals to travel further than normal, so it is possible that you are receiving another transmission on the same frequency, most likely from Sandy Heath. If you have lost the channels from the channel list you will have to re-tune when the conditions change, otherwise wait and see if reception returns. If the problem persists do the usual checks on cables and connectors, and make sure that no equipment, such as a VCR or Sky box has the RF modulator set around C48.
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A: You are correct, Saltdean is a dependent relay of Whitehawk Hill. The ITV1+1 region for all Meridian transmitters appears to be Meridian Southampton as there are a limited number of ITV1+1 regions generated at this time. As a matter of interest your best bet for reception of the COM muxes is predicted to be Heathfield, available after 13th June 2012.
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Nathan, Southsea: Your out of area BBC1 analogue could have been from Heathfield.
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Joe: Reception of Mux ArqA on C54 is possibly being blocked by a stronger signal from Waltham on Mux D3+4 at 50kW traveling further than normal. When the weather conditions change you should get the ArqA channels back.
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G Davies: Mux2 and MuxA are both 4kW from Bluebell Hill, Reigate is 2kW on these frequencies, which it will continue to be after switchover. I'm guessing that your predicted interference is from Reigate, which is vertically polarised, rather than Rowridge, although I don't know which frequencies are affected most by French transmitters.
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peter behrens: If you have BBC1 alright, but BBC2 comes and goes it suggests that you are receiving and storing channels from two or more transmitters. Is there a BBC2 in the 800s of the channel list that works correctly? If the aerial is pointing to Midhurst it is likely that Heathfield signals are being picked up from behind the aerial, as these channels are on a lower frequency they are stored by the receiver, the Midhurst channels being stored in the 800's or ignored completely. In the present weather conditions, when out of area signals are traveling further than normal it is also likely that you found signals from other transmitters. As is the nature of such reception, these signals tend to fade in and out, resulting in them being present when you happen to do a channel scan, but absent a short time later. The original loss of reception which prompted you to re-tune could have been caused by the powerful Mendip transmitter swamping the Midhurst signal for a time. Ideally you should not re-tune at such times as the reception will return to normal when the out of area signal fades out. Do a manual tune of the Midhurst frequencies, if the receiver permits this. Otherwise start the scan with the aerial unplugged, plug it back in before C50 to store the Midhurst channels.
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Nathan, Southsea: If you still have the channels stored for the transmitter carrying Westcountry news, is there any frequency information carried in the menu of your receiver? C23 would indicate Stockland Hill, whereas C54 would be Mendip. I'm not sure whether the terrain would hamper signals from Stockland Hill traveling in your direction. On the other hand Mendip does serve some parts of Poole, so would not have to go that much further to reach your area.
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MH: The Digital UK postcode checker does not make a prediction for reception of Mux2 or MuxA from Bluebell Hill at the present time. The other muxes are shown as variable, with all six muxes being variable after switchover on 27th June 2012. Crystal Palace is good (reasonably) on three muxes and variable on the rest at the present time, but good reception is predicted for all muxes from 18th april 2012. Additionally Sudbury is shown as giving good reception on four muxes at present, with all six muxes good from 27th June 2012 when ArqA and ArqB adopt final frequencies and power increases to 100kW.
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Walter: It all comes down to money. The owners of the COM muxes were invited to increase the number of sites at which their services were transmitted, but declined on the grounds that the cost of transmission would double, but only a small percentage of extra viewers would be added.The Digital UK postcode checker predicts that you are able to receive all services with good reception from the Whitehawk Hill transmitter, subject to using a suitable aerial and not having any local obstructions (trees or tall buildings) blocking the signal path.
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Monday 26 March 2012 12:31PM
Yakoob: BBC South is transmitted from Rowridge and BBC Southeast from Whitehawk Hill. Look in the 800s of your channel list to see if your receiver has already found and stored the signal from Rowridge. If it is not there, try doing a manual tune on C24. It might be necessary to install a second aerial pointing at Rowridge to receive this service, assuming that there are no local obstructions in the signal path preventing reception of it. The two aerials would then be linked together using a diplexer to give reception of all the available muxes.