All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
SYD KEEBLE: LBC broadcasts on 97.3MHz FM from Croydon.
The high ground at and around Warley may be the reason why reception is variable, you residing at the bottom of a steep drop.
This plot shows the transmitter on the right and your location on the left:
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
Whilst FM radio signals don't rely as much on line-of-sight as TV, you are clearly not in the best spot.
The thing to do is consider whether the radio can be resited so as to have a clearer view in a south-easterly direction.
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Dave Woods: Turn your aerial to vertical - there is no need for a replacement (unless it is defective).
Rowridge is unique as a main transmitter. It broadcasts mixed polarisation. The COM channels, which are the three you quote, aren't as strong horizontally.
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Lee: Err no.
There is a two-tier network in the UK now. The Public Service (PSB) channels cover the same area that the former four-channel analogue did (from the same transmitters). The Commercial (COM) channels broadcast from the biggest transmitters using channels that fit in, thus they have inferior coverage.
I gather your aerial is pointing to Llanhilleth which relays Wenvoe's PSBs and broadcasts them on the same channels as Wenvoe uses to radiate its COMs.
It is doubtful you will be able to receive from Wenvoe. Even if you can - perhaps with some monstrosity on your rooftop - you will be no better off as you certainly won't pick up its COM channels because they will be drowned out by Llanhilleth!
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Lee: For an explanation as to the reason for the two-tier network, see:
Londonderry (Northern Ireland) Freeview Light transmitter | ukfree.tv - 11 years of independent, free digital TV advice
I suggest you consider Freesat.
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Dave Woods: In which case if it is a communal aerial system then it is down to the party responsible to make any changes, this including fitting any necessary 4G filter as much as changing the aerial for vertical polarisation.
As a user of the system the reason is surely largely irrelevant. If there is no signal coming out of the wall socket, on some or all channels, then the party responsible should be notified rather than a website devoted to solving issues.
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Dave Woods: The organisation that can tell you whether there is a 4G base station operating at 800MHz is at800 | 4G Interference | 4G Filters | Let's be clear at 800 Mhz
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William Wren: This may be down to interference from Divis' COMs, which are co-channel.
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William Wren: Maybe it is traffic going along the A596, which intersects the signal path and may be at or near the top of the brow over which the signal comes:
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
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Ian Carrick: Can you resite the aerial? Maybe it's worth sliding the aerial down the pole which it's mounted on.
You would appear to not quite have line-of-sight, what with the ground just blocking the view 4 miles away:
Map of area between NY470294 and
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Thursday 25 July 2013 4:42PM
jb38, Ian Kinnaird: Unfortunately the Scoval VP radiations patterns aren't available:
Eitshal Group Photos by MikeDimmickTx | Photobucket