All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
KMJ,Derby: Thanks KMJ. I believe this is the model you refer to:
V20A2 20 Element Log Periodic Group A Aerial ? Vision Products - Powerful Products. Easy Installation. Excellent Value
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Brian Murray: There may other retailers of the Vision 20 element Group A Log (V20A2), but after a quick search here are two I found:
VISION AERIAL LOG PERIODIC GROUP A - V20A2 - Vision: Amazon.co.uk: Electronics
V20A2 Vision Aerial Log Periodic Group A | eBay
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anthony: I would think that both ukfree.tv and mb21 are correct.
ukfree.tv gives the antenna height AOD (Above Ordnance Datum) and mb21 gives the structure height.
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Chris Norton: If BBC One and ITV on logical channels 1 and 3 respectively are being received from Belmont (E Yorks & Lincs) then the other PSB1 (BBC Two, BBC Three etc) and PSB2 (ITV+1, Channel 4, Channel 5 etc) services may well be as well.
If your amplifier has a variable control on it, try turning it down in order that the Belmont signals be reduced such that the PVR doesn't go with them. This could, however, cause the lower powered Notts TV multiplex to be lost because it isn't as strong.
Or use manual tuning for all Waltham channels.
Or run the automatic tuning through with the aerial out up to UHF channel 40 or 50%. This will miss out PSB1, PSB2, PSB3 and COM4 from Belmont. It will, however, miss out COM4 and L-NOT (Notts TV) from Waltham -- a manual scan of UHF channels 29 and 26 should add them.
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phil walpole: It's either Moel-y-Parc or Winter Hill at your location. If neither are possible then the only way to receive extra HD services is via satellite (e.g. free-to-air Freesat).
If you reside in the block of flats then your hands may be tied by what the landlord wishes to do, not to mention the question of whether the nearby tall buildings might be in the way, which I suspect they may be.
Terrain plot to Winter Hill (click the link below to view a map with a line between the two points):
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
The terrain up to about a mile out and objects on it might be in the way. For one, the hospital would appear to be in the way for all properties on Trowbridge Street.
If you're in one of the houses then you may well have free reign on your aerial but no doubt you're even more restricted due to less height.
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Bob Partridge: Using a six-figure OS Landranger reference, as required by the terrain plotter, the base point is almost where the long/lat co-ordinates you gave resolve to. The plot shows that transmitter can't be seen due to higher ground at Churchstow:
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
With that postcode the Digital UK Coverage Checker doesn't return any result, not even a very poor one.
If this is correct, and you can't see the transmitter, and by such a degree, then maybe what I said still holds -- that it's a case of moving the aerial hoping to find a sweet spot.
Freesat might be the best course of action, just so long as the dish doesn't get snow on it!
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Perhaps one of the pros on here could give their thoughts on Bob's issue.
(I write on here as a technical bod rather than an aerial installer.)
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Bob Partridge: The only other thing I can think is that, if you do indeed have the aerial at the bottom of such a slope, you point the aerial upwards slightly, if its bracket permits.
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Bob Partridge: Think of it in the positive (why one multiplex is received) rather than in the negative (why one isn't).
Signals travel in straight lines. Without line-of-sight you are having to rely on the signals bending around the obstruction. The thing is that different frequencies bend in different ways around the same object. Thus, within the shadow of the obstruction there will be places where one signal is available but another isn't.
The only way all signals (of differing frequencies) would travel the same and therefore be received the same is if there were nothing around, no objects, no ground and there was a vacuum. Once you introduce things you introduce the tendency for signals to be affected.
I guess if your aerial is 30m off the ground then it must be in a tree. I wonder, therefore, whether the tree could be affecting the reception.
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Sunday 14 June 2015 11:39AM
Tony: Conceivably the amplifier could be being overloaded and all that installing an attenuator after will achieve is giving a smaller distorted signal. In such a case the amplifier needs turning down.
Then there's the point about everyone else in the block -- this doesn't help them, if you have indeed identified the problem.
The aerial system should provide suitable level signals from the wall socket in each dwelling. If it's not then the party responsible should be notified in order for it to be put right.
Also, if you don't have the two new HD multiplexes, COM7 and COM8, which give BBC Four HD, BBC News HD and QVC+1HD, then this could be because the system is filtered to only allow through the channels (frequencies) of the designated transmitter, these being two new ones. Get the engineer to enable these channels, if need be.