All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Peter McMahon: Lots of advice and products at www.aerialsandtv.com
Wideband yagi are less sensitive at lower (Group A) frequencies. See Gain (curves), Again
If you're going for Divis and require a high-gain aerial, probably best to get a Group A on rather than a wideband. This is the advice given by ATV.
One thing I will say is that prior to switchover, Mux C is on channel 48 and this is the only one that is outside Group A. After switchover, Divis will return to being a Group A transmitter.
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lisa: There has been no retune events for Rouncefall.
I wondered if there might be any connection to your change in reception and switchover events that happened last night.
Midhurst switched last night but it did not use the same channels as Rouncefall before or after switchover.
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Chris: There are quite a few areas of Wales where the Commercial (COM) channels such as Dave will never reach. Due to the terrain, there are many small transmitters that the Commercial operators aren't bothered with.
Merthyr is one such example; it is a Freeview Light transmitter, only carrying the Public Service Broadcaster (PSB) channels.
See Freeview multiplexes | ukfree.tv - independent free digital TV advice for a list of all the multiplexes. The PSBs are BBCA, BBCB and D3&4. The COMs are SDN, ArqA and ArqB.
ITV4 is COM and I am not aware that there is a Welsh version. Are you referring to S4C? If so, in Wales S4C is on logical channel number (LCN) number 4 and Channel 4 is on LCN8.
If you provide a full post code, a more accurate prediction of the likely possibilities can be made. Aberdare transmitter is a full Freeview transmitter (it carries PSBs and COMs). It also requires aerials to be vertical.
Looking at your neighbours' aerials will also yield clues.
For Merthyr Tydfil transmitter, your aerial should be vertical.
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Phil: A look at the Digital UK Tradeview predictor for your post code (click the link next to your posting) is interesting.
For all multiplexes from Midhurst, it regards 100% of the post code area "served" (on its criteria). However, C61 (D3&4) is 96% "served" and 100% "marginal", so too is BBC B (HD services) on C58. The key here is not the absolute values, but the relate difference of these two multiplexes.
This could perhaps be a suggestion that there is another transmitter whose signals might be detrimental to reception of these multiplexes from Midhurst at this location.
In October this year, D3&4 is due to move to C56, and that too has the same 96% served prediction.
I've looked at the transmitters which use C61 and I've not come to any definate conclusion. Mendip uses C61 and C58. It also uses C56 at the same power as 61 and 58.
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JIM: Could you receive any Freeview before switchover?
If your aerial is pointing at Brighton Central, then you will only receive BBC channels; the rest will come next Wednesday.
All the aerials I can see in your road on Google Streetview are on Brighton Central and it is on the top of Theobald House. Aerials should be horizontal for it.
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george austin: If your combi does not have Freeview built in (that is it is analogue only; previously you receive only the four or five channels), then it will need a separate Freeview box to work after switchover.
This creates its own issues when programming by timer. You would need to set the timer on combi and that on the Freeview box (or leave the Freeview box turned on).
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george austin: The poor picture you have on BBC channels could be as a result of your receiver tuning to a transmitter other than the one to which your aerial faces.
You have said that your aerial is on the roof, but have not said which transmitter or which direction it is pointing. I shall assume that it is directed at Whitehawk Hill as that is where all the aerials point in your road on Google Streetview.
For Whitehawk, aerials are vertical and it is located near to East Brighton Golf Club and East Brighton Park. You are near to the Brighton Central transmitter which is a "filler-in" for those that can't receive Whitehawk. There is also the possibility that you could be picking up the main Rowridge transmitter (Isle-of-Wight).
To find out which you have, go to the signal strength screen whilst on BBC One and it should tell you what UHF channel it is coming in on. If it's 24, then you are picking up Rowridge, if it's 41 then you are picking up Brighton Central and if it's 60, then it's Whitehawk.
If you are picking up Rowridge, then run the automatic tuning scan with the aerial unplugged up until 50%. If it's Brighton Central, then that's a bit more tricky. Try 50% and if you still have issues, post back and I will offer a further suggestion.
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lgb2100: This tells us that one is tuned to one transmitter and the other is tuned to the other.
As a guess, you have Emley Moor and Bilsdale which give Yorkshire and Tyne Tees respectively. As you haven't given your location or direction of the aerial which is common to both (or indeed which transmitter it is facing), then there isn't really much else I can say.
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lgb2100: I wouldn't have thought that you could pick up Emley Moor in South Shields!
Perhaps it is or was a mistake on the EPG.
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Wednesday 14 March 2012 10:43AM
Steve: Channel 24 is BBC A multiplex (BBC One, BBC Two etc) from Rowridge. Midhurst's is now on 55.
In fact, Midhurst uses channel 50 upwards. You could run the automatic tuning scan with the aerial unplugged up to 55% to ensure that you don't pick up Rowridge.