All posts by jb38
Below are all of jb38's postings, with the most recent are at the bottom of the page.
Paul Jones: Well its OK, but not any more powerful than the one you are presently using so you aren't really gaining anything, but give an update on your aerial findings.
But though I feel that you might benefit from using another type of aerial that incorporates a built in booster of a higher gain but am unable to provide a link for it from this laptop, although I really prefer anyway to wait and hear the result of your aerial check as this may be the cause of your problem, and especially so if its been accidentally been mounted horizontally.
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David Brinkman: Thanks for that update, and which was very revealing insomuch that what you have reported somewhat falls in line with what's seen forecast for your area, as even although the predictions made have always to be taken with the proverbial pinch of salt, but when they are backed up with signal reports such as you have given from the actual area then they cannot be totally discounted.
As far as your problem is concerned, on-site testing is about the only thing that can positively prove this or otherwise, but I strongly suspect that "if" the reasonable level of signal that you were previously receiving did suddenly change at switch over (exactly on) then it was most likely because the signal you were previously receiving was only possible because it was being reflected off some no too distant object of a stable nature, the problem experienced now being that the signal path between the mast and you has changed slightly with the increase in transmission power and is not now being reflected from whatever, hence the reason for your signal taking a dive, as its quite inconceivable for anyone picking up a signal from an "out of area" location to enjoy reasonable reception from a 20Kw transmitter but not when it powers up to 200Kw.
About the only things that could cause this being that the powerful signal is blocking your tuners input, (or aerial amp if you use one) but this possible overload theory was eliminated by the negative result from the aerials "just about out" coax plug test which proved that your TV's tuner is not being blocked by an excessively high level of signal, that said though if it was an aerial amp overload problem then you would not know this, as the indications seen on the TV would be similar to what you have reported, so keep this in mind "if" you have an aerial amp. So this only leaves the previously received reflection theory, as I know through my personal experience in my non-domestic role (not TV TX's) that in a difficult reception area an increase in transmission power can sometimes have adverse affects of the nature described.
These things applying, I cant really cant see your situation improving as far as reception is concerned without possibly allocating some time to carry out a few experiments with your aerial, the first and easiest task being to turn the aerial used to feed the G20 to its vertical position and make sure that its actually pointing at 95 degrees, as Rowridge's Vertical polarity TX aerials are the only ones presently indicated as being able to providing satisfactory reception, and I use the word "presently" because that according to the predictions seen on the 18th the BBC (V pol) muxes take a step backwards by entering the status of variable, and with the commercials actually starting on, and remaining permanently with the same variable status.
By the way the changing reflection situation referred to is not that unusual in most non line of site reception areas albeit that most are unaware of it occurring unless their signal gets slightly degraded, and indeed was in evidence in my own reception area although in reverse, as when the East Midlands Waltham transmitter switched over to high power I noticed a few comments being made that reception was excellent if the aerial was turned slightly clockwise (taking it slightly out of alignment) and was something which I had already noticed myself and likewise corrected.
PS: The technicalities attached to the G20 have been eliminated from this as that model is bang up to date.
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Big Mart: You ask if you would require to carry out a manufacturers reset next week when the next re-tune is required and I in effect said no, although not as many words!, as if you carried out a re-tune "with the aerial unplugged" that would delete anything stored.
The reason I specifically did not mention manufacturers reset is because as you have found out for yourself all of your personal settings will be lost, and this puts some people to a lot of bother "if" they are unaware how to remake all the personal settings.
In other words, the procedure I mentioned in most cases is all that's required, its only if some odd problem happens to crop up then its time for the full reset to be carried out.
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MikeW: No problem! as I realise that many people are liable to be away at this time. However as far as your interference is concerned there really isnt anything you can do that would help the situation if its caused by atmospheric conditions, but should it happen again make another posting and I will be able to verify if its local to yourself or not, or alternatively you could just enquire across the street to see if they are affected, making sure that they are on the same channel AND station as you, as otherwise whatever is found out will not be accurate.
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Nadia: If by any chance you still haven't received anything then purely for a test try a manual tune on Ch34, the only reason for requesting being, that as its possible for you to be located at only about 7 miles or so from from the transmitter you might be receiving an excessively strong signal that is blocking your TV's tuner, although if this was the case then trying an auto-tune using a set top aerial would soon reveal if you are or not should the auto-tune prove successful.
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David Brinkman: Pleased to hear that you have sorted the "mystery" out insomuch that the problem was caused by the actual aerial amps themselves being overloaded. I would though be obliged if could let me know the brand of the devices involved, this to enable me to check on the circuitry / transistor type used in them.
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Wendy Leak: Auto-tuning a box in the Grantham area can result in a mixture of Belmont and Waltham being picked up, and so you have to ensure that the three correct commercial transmitters have been picked up.
To do this select EPG 10 (ITV3) and then carry out a signal strength (condition) test whilst on it this done via the tuning menu, although its not so much the signal strength you are interested in but the transmitter channel number associated with the indication and which should be Ch29.
Once done go back out of the screen then select EPG 11 (Pick TV) and carry out exactly the same procedure as before, but this time you should see Ch56.
Repeat this entire procedure again after selecting EPG 12 (Yesterday) and in this case Ch57 should be seen.
Try this and give an update on results, as if these numbers arent seen then the box will have picked up Belmont, so you will require to manually tune them in to get Waltham.
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Wendy Leak: Just a minor alteration to what I mentioned, to find out what the transmitter channel number is whilst on the any of the EPG numbers mentioned, do it by going into: Menu - settings - system - signal detection and you will see the actual transmitter channel on the right hand side of the bar.
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PR MARTELL: As you havent provided your location (pref: post code or one from very near by) its impossible to verify this, but if its mainly the PSB channels thats missing then your TV or box could be getting overloaded by an excessively high level of signal so if you have any booster in line by pass it. If though you do not have a booster then for a test try a set top aerial or even a short piece (about 12") of copper wire pushed into the middle part of the aerial socket, and re-scanning (essential) after having fitted any of the mentioned as the programmes will not be in the receivers memory.
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Tuesday 10 April 2012 10:56PM
Humax man: Yes, but have you double checked to make sure that the Humax and the LG are definitely receiving Film 4's mux from the same source? mux channel info obtainable via the signal check screen, as Humax tuners are amongst the best for stability of reception under difficult circumstances, although its not known whether this might apply or not in your case as you havent provided any info on your location, this preferably being in the form of a post code (or one from nearby) for greater accuracy.