All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Stu P: Are you using a communal aerial system? They are sometimes filtered to allow through the channels used by the transmitter.
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Keith: Have you tried a manual tune on UHF channel 39 (for the missing BBC services)? Prior to pressing the button to scan, having entered or select C39, see if it gives an indication as to strength/quality.
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Marc: Where about are you? Could it be interference from Hannington which also uses C42?
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David Branfield: There are no known issues with the Mendip transmitter.
Try bypassing your amplifier by connecting the aerial directly on to one of the TV feeds.
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Keith: Perhaps the only thing left is a full/factory reset. What's the make and model of your receiver (box/TV with built-in Freeview)?
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alex: Based on the date that the problem started, I suggest that might be interference from Divis. Its completed switchover on 24th October 2012.
The COM channels of Darvel, Divis and Caldbeck are co-channel and at half power to their PSBs.
Until Divis switchover, Darvel used its reserve antenna to radiate the COM channels and Caldbeck's was restricted in ERP.
Darvel uses all Group A channels, so if you use yagis, don't use wideband ones, use Group A yagis:
Rowridge Transmitter
http://www.paras.org.uk/a….pdf
The Divis coverage map on this site has a few blobs of colour near Saltcoats.
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luke callanan: Reception of RT is not a given. In your general area there are spots that you definately won't get it.
Any prediction is just that and in reality what can be received is best checked by an installer on-site. However, we can, with a more accurate location get an idea as to what the chances of success might be.
For example, I looked at Conlig. Looking on Streetview at Tower Road, all the aerials point at the local relay transmitter or, I believe, Cambret Hill in Scotland, both of which are Freeview Light and don't carry RT. On Forest Hill, aerials point to the main transmitter, Divis. Whilst Divis does not carry RT, Black Mountain does which is close to Divis, thus a lot of people whose aerials face Divis will be able to receive it. However, the Digital UK predictor suggests that RT from Black Mountain will be poor on Forest Hill whilst Divis is good to variable.
All in all, it depends where you are. It would appear that the terrain isn't flat which means what can be received and what can't varies.
Freeview Light means that only PSB channels are available: all BBC standard definition TV, high definition TV and radio, UTV, UTVHD, Channel 4, Channel 4HD, Channel 5, Channel 4+1, E4, More4, ITV2, UTV+1 and U105.
If you can receive RT from Black Mountain then you will require a Freeview HD receiver, even though the pictures are in standard definition. This is because the signal mode is DVB-T2 which is that used by Freeview HD broadcasts.
Whilst Freesat will work with your satellite dish, it will not give you RT, you will need Saorsat for that but that probably requires a separate dish. The reason is because the satellites for each service are in different orbital positions. If you search the internet for Freesat and Saorsat you may find some useful information. I'm not a professional so can't advise you much more on this.
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Mellor: Bring up the signal strength screen on Yesterday. Observe the tuned UHF channel number. It should be 48 for Sandy Heath, which I gather you are likely to be receiving from. Ensure that it does not say C28 which is Crystal Palace and is in almost the opposite direction.
If it is tuned to Sandy Heath then have you had your Group A aerial, from the days of four-channel analogue, replaced with a wideband one?
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Saturday 25 May 2013 2:42PM
Peter Hedges: I'm not one to judge! You've come on here with a technical query and I've offered a hypothesis based on what I can see.
If receiving from two different transmitters does cause an issue then perhaps the answer is to use Oxford as your 'main' one with Sutton Coldfield tuned in the 800s for use when regional programming is being broadcast.
I suspect that in some situations it may cause difficulty with recordings starting automatically where they rely on the EPG data (i.e. a signal sent out by the broadcaster) as opposed to one that is timed and whose start time cannot be altered by the broadcaster.
Let's say you are watching a programme on BBC One but have programmed something on ITV. The programme on ITV starts early but your recorder switches channel (assuming it has only one tuned). It stands to reason that the EPG signal that 'told' the recorder that the broadcast time had been brought forward must be carried on the BBC multiplex because the device can only physically receive one multiplex at a time.
I suspect that sometimes a combination of two transmitters may mean that the EPG data for the timed programme (on another channel from another transmitter) may not be carried by the transmitter/channel being viewed.
As I say, I think it's a "try it and see" sort of thing, being mindful of the possible issue. I don't think that what Samsung told you should forbid you from trying it. It may be that it only affect certain recordings at certain times; as I say I don't know the ins and outs of how it works so can't say with any certainty.