Full Freeview on the Hemel Hempstead (Hertfordshire, England) transmitter

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7:53 PM

jim: Alongside each , on the green bar, it says "vertical".

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Michael

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7:53 PM

jim: It's vertical, beneath the column heading " position" above.

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trevor montgomery
9:10 PM
Bushey

Question:- Is there a future intention to add BBC4 HD and BBC HD news to the . At location WD232AQ Crystal Place is unreliable in bad weather conditions/refraction angle, Sandy and are even less HD reliable and don't carry local news and that's all using a 27m , 20db forward and 1.7db nf mast preamp. signal is no problem but bandwidth/ is less than freeview plus it very messy to switch from freeview to just for two .

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trevor's: T's Freeview map T's terrain plot T's frequency data T's Freeview Detailed Coverage

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9:23 PM

trevor montgomery: No, not in the foreseeable future at least.

The new HD mux will be co-channel with that of , so even if you used it you might find it wiped out at times. The of the new mux from is 36.3kW as against 200kW for the other six .

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9:36 PM

trevor montgomery: Have you fitted aircraft warning lights on your ?

If you can receive the new () from then you could diplex your aerial with it so as to use Hemel Hempstead for all viewing except the new HD mux.

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9:57 PM

trevor montgomery: As you may be aware the cause of your difficulty with from is the high ground at Bushey Heath and Stanmore Common, which is heavily tree-laden.

With this in mind, the use of a high- is probably best not advised as it means that the "beam" width you're receiving across is narrower - it's that narrow angle which you're relying on for good . A lower gain aerial would provide a wider acceptance angle and therefore "poor" quality over a narrow part of its acceptance angle wouldn't deminish the quality of the signal coming down the lead as much (of course that isn't to say that it will be good enough).

The point is that with you have strength and quality. You can make the signal stronger by amplifying it but quality starts at the aerial.

I write these comments as a technical bod rather than an aerial installer. I have, however, taken this knowledge from one of the experts on here and it makes perfect sense.

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gtibb
12:29 PM
Hemel Hempstead

The only chance of getting all the BBC HD from Hemel (or indeed any ) is if DVB is dropped in favour of DVB-T2. That would allow all the BBC HD channels to fit in the BBC A mux.

If the band is taken for mobile in a few years, this will have to happen anyway.

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gtibb's: G's Freeview map G's terrain plot G's frequency data G's Freeview Detailed Coverage

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KMJ,Derby

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1:59 PM

gtibb: There is only room for five HD on a single DVB-T2 at present, so even allowing for BBC Parliament remaining in SD (which would seem sensible as a cost saver) the capacity would have to increase somewhat to fit in 10 plus red button HD alongside all the other BBC HD channels. It will be interesting to see if PSB3 continues to carry BBC1&2 HD plus ITVHD and Channel . This would actually be more sensible as there would then be one multiplex for regional content, allowing PSB1 to be a national service on fewer frequencies than at present, also only one multiplex (PSB3) would then need to be transmitted from regional correction stations. It is possible, however, that only the COM muxes will switch to DVB-T2 in 2018 since if the level of DVB-only equipment remains too high at that time is likely to require PSB1 and PSB2 to continue in SD as at present until some later date in order to maintain a service to viewers with older equipment.

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Anthony Denyer
10:52 AM
Berkhamsted

gtibb: I am tuned to Bedmond as the Crystal Pace is to weak. As I have read on your site, BBC4 HD is not available. Will it ever become from Bedmond? My current problem is that both my HD TV and HD Freeview recorder both keep saying I should retune, but no new appear to be there. Is it something to do with as it is almost in line with Bedmond from where I live?

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Anthony's: A's Freeview map A's terrain plot A's frequency data A's Freeview Detailed Coverage

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3:43 PM

Anthony Denyer: It isn't likely. The plan for the new quasi-national HD multiplexes (one of which carries BBC Four HD) is for 30 transmitters only. This isn't likely to change until the end of 2018 at the earliest.