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All posts by JLM,Ely

Below are all of JLM,Ely's postings, with the most recent are at the bottom of the page.

J
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Tuesday 24 September 2013 11:38PM

No main channels such as BBC1, 2, ITV and Channel 4 23/9/2013 and 24/9/2013. Poor to no signal on CH24 & CH27. Good to 100% signal on DVB CH52. I'm no expert on this and really struggling here. Weather warm for this time of year, cloudy, no rain. Checked my Technika Digital outdoor aerial physical connections which all seems sound. Symptoms suggest a transmitter fault (I cant see any faults on the web for this transmitter) or a booster fault (my Tesco aerial comes with a powered booster) because the signal seems to fade in and out over a 5-10 minute period.

Can boosters fail? How can I easily test this? Can aerials fail? I thought such aerials were passive and only failure could be connection, cabling or physical damage.

- - - - - - - details - - - - - -
CB6 3, Little Thetford, Cambridgeshire. Sandy Heath is 26 miles distant bearing 232. Outdoor aerial is 7m above ground level. It is mounted vertically almost exactly like the image shown here with the thin dimension pointing to the transmitter: Buy Technika Digital Outdoor Aerial from our Aerials range - Tesco.com (CB63YE)

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J
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Wednesday 25 September 2013 12:24AM
Ely

Further information: Aerial is a Technika Outdoor Aerial for Digital TV model ARLSSS1103. Freeview reception is via either a Panasonic TX-32LXD1 or a
BT Vision integrated digital terrestrial receiver model DIT7421/05.

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J
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Wednesday 25 September 2013 11:11AM

*SOLVED* (at least daytime reception)

@jb38. Thank you for your detailed response.

Firstly, my apologies. It seems we have been having fog in the area. Not just cloudy no rain as I at first stated.

Secondly, I looked up the Sandy Heath transmitter information from here UK digital TV reception predictor which suggested that the transmitter was horizontally polarised. I adjusted the aerial so that the longest dimension was pointed at the transmitter which, according to the Technika instruction leaflet, is horizontal polarisation.

Prior to the adjustment, auto-tune (BT Vision-->Settings-->TV Settings-->Add Channels to TV Guide) on the BT Vision box used to find around 70 channels and signal strength and quality varied. After changing the polarisation, the BT Vision box found 144 channel and all the channels checked so far are showing 100% signal strength and quality. Specifically, BBC 1, 2, 3 & 4 on 522MHz and ITV 1 & 2, Channels 4 & 5 on 498MHz all showing 100% signal strength and 100% signal quality (via the -->DTI Signal Strength on the BT Vision box).

So, the problem may be solved. I will re-post after 7 pm this evening in case it is different after sunset. (CB63YE)

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J
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Wednesday 25 September 2013 9:46PM
Ely

Solved. See above.

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J
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Thursday 26 September 2013 6:24PM
Ely

@jb38. I am happy that my situation is resolved but unhappy because I have suffered with generally poor reception for over a year; since my incorrectly polarised aerial installation in fact. Until I purchased the outdoor aerial, I was using an indoor aerial. I purchased and installed the outdoor aerial then called BT because the reception had not improved as much as I expected. The BT engineer came during the afternoon and tested my newly installed outdoor aerial and said the signal was low but acceptable. At the time, I asked him about polarity and he said I had installed the aerial properly. Thus, for more than a year I was under the (now mistaken) impression that my aerial was correctly installed and thus I suffered with intermittent issues as previously described.

Back to now. Wolfbane (http://www.wolfbane.com/cgi-bin/tvd.exe?DX=L&HT=10&OS=TL532760) suggests I can expect around 52dBV/m for my location, TL532760.

May I take advantage of your skills one last time? I read (recently in the Technika ARLSSS1103 aerial booklet) that some receivers provide 5V at the antenna connector which means in such situations, a booster is not required. Does either or both of my Panasonic TX-32LXD1 and/or my BT Vision integrated digital terrestrial receiver model DIT7421/05 provide such a voltage on the aerial connection? I think it is also known as phantom powered aerial socket.

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GB