All posts by jb38
Below are all of jb38's postings, with the most recent are at the bottom of the page.
Roger Whitman: HD reception from Rowridge is not shown as being possible until March 21st at switchover stage 2, and the HD service will be transmitting bon Mux Ch21.
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Roger Whitman: Just to add the section that I didn't paste in properly, in situations such as yours its best to forget about auto-tuning and just manually tune in each of the muxes required.
However as far as Rowridge (@ 41mls / 164 degrees) is concerned I feel that I should point out that Hannington (@ 17mls / 76 degrees) is indicated as a better bet altogether, as from April 18th Rowridges commercial multiplexes dip into the status of being variable reception, and are seen to stay that way right into 2014.
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Mike Dimmick: Yes, I see what you mean Mike, and I suppose that using Rowridges VP is a good way around the problem should for any remote unforeseen reason Hannington prove less than satisfactory.
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paul: Are you sure that what your neighbour was told regarding a strong signal isn't the very thing that's causing your own problems? I say this as BBC channels can generally be regarded everywhere as being the strongest, so purely to test whether they are or not in your case, if you have a set top aerial lying around plug that in and see if any BBC channels can be picked up.
The only reason for requesting this test is that the misleading aspect about an excessively strong signal is that it can give exactly the same symptoms to that of a weak one, this causing confusion to many as even if a signal strength check is carried out it can also sometimes indicate low, but this is caused by the circuitry used to measure same running on the verges of instability resulting in inaccurate readings being given.
Of course that being said, maybe it isn't the case of an excessively high signal, but no matter what as far as an aerial is concerned I would suggest using something like a modest DM log periodic type such as seen on the link provided, as anything larger generally has an adverse effect on reception in situations such as yours where excessive distances aren't the problem.
Online TV FM DAB Aerial sales
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Denise farnaby: Thanks for the update regarding the model of TV involved, but its the 10 minutes or so you refer to that gives me cause to wonder if its your TV itself that's causing the problem, as any external faults that might be occurring would generally be of a totally random nature, whereas not if originating from within the TV, like for example a faulty tuner, isn't it possible to borrow a small Freeview portable from someone for an aerial test?
Also I find it slightly difficult to check on your previous postings as they are not all under the same heading, but on what I did find I cant see you having mentioned anything about the aerial you are using, like where its installed and does the aerial go through anything such as an amplifier etc before it reaches your TV?
Also on your March 1st (@10.40am) posting you mentioned that you had purchased an HD unit and it was just the same, what was the HD unit?
Regarding the attenuator, what's printed on it as far as the dB reduction figure is concerned, as you didn't mention what it was and if its too weak it wouldn't make any difference to a strong signal.
These might seem like a lot of questions, but they are necessary to be able to assess what is liable to be causing your problem.
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Chris_T: Yes that's quite correct, as Rowridges commercial Mux's on horizontal polarity will only be running with an ERP of 50Kw compared to the main PSB transmitters on 200Kw, as indeed are all of the multiplexes transmitting on Rowridges vertical polarity.
The 50Kw from Rowridge being necessary as Crystal Palace also uses the same channels on their horizontally polarised commercial multiplexes.
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Nicholas Willmott: According to DUK information Mendips SDN is presently running on 70.7Kw and with ArqA on 12.5kw and ArqB on 27.5Kw.
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Ron Lake: Re; Denise Farnaby's problem, yes! that's exactly the line of thought I am beginning to have regarding this problem, and to be honest as an engineer I should really have suggested right from the start that the aerial system should be tested by connecting it to another TV, an action that would have instantly verified if the fault was within the TV itself or not, as with the involvement of a time factor coming the equation could well suggest that it might be, and indeed possibly for reasons as mentioned by yourself but connected purely with the digital side of the set, as it was mentioned by Denise that analogue could still be received suggesting that the TV was OK in other ways.
On the other subject regarding David Mansell's views on the licence fee and PSB only relay stations, I am in total agreement with the content of your reply on this with your 12.26am posting on 4th really saying it all, as people have to realise that just because they might well have a licence doesn't automatically give them the "God given right" to receive anything more than services linked in various ways to the licence, which of course additional multiplexes are not, albeit that the licence regulations are cleverly (but loosely) worded to ensure that virtually no-one escapes paying by trying to maintain that they only view commercial multiplexes and such likes.
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Rob: If you use either a Freeview HD or Freesat HD box with both having HDMI sockets then you dont require to use the scart lead, if your TV has more than one HDMI input make sure that this one is used or you will have to select the HDMI input used via the TV's input selector which is usually located on the remote control.
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Sunday 4 March 2012 4:47PM
Elaine: Its pity that you carried out a re-tune as you will have lost ArqB on Mux Ch63 from the TV's / boxes memory as otherwise I would have requested that you to carry out a signal strength check whilst on ITV4 etc, because its likely that the signal had just dropped under the reception threshold level and which would have returned when the it lifted again, as the signal level will still show even although there is no picture.
The reception predictor (trade view) isn't really of any assistance on your particular area code either, as it in effect indicates that you are in a black spot for reception from Sudbury and with no reception from commercial muxes being possible until June, so even although you maybe can receive them there has to be an element of pot luck about it as they are very low powered, so about the only thing you can do is to keep trying a manual tune on Ch63 every few hours until it returns to a level that the receiving equipment can lock on to.
By the way, the commercial multiplexes such as one of that's causing problems, wont be switching over to high power until June 27th when a re-tune event takes place.