All posts by Michael Perry
Below are all of Michael Perry's postings, with the most recent are at the bottom of the page.
Malcolm:
That sounds as if you have some local interference and not the transmitter.
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gordy:
We need a full post code so we can check which transmitter you might be using. However, there are no reports currently of problem at any transmitter in your area.
Please check all your signal cables and their connections. A faulty/poor connection can cause the problem you report.
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StevensOnln1:
Thanks for that. Even That's TV doesn't seem to realise the problem it is causing! Who ever allocated the same frequency to two different services when the transmitter service areas overlap so much is clearly not blessed with knowledge of how radio signals propogate and then cause interference. Perhaps a strongly worded communication to Ofcom is needed?
Best regards
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Nicholas:
I strongly suspect that what you are commenting about is a result of low bit rate transmissions, used by the broadcasters to cram more channels into the available space on the multiplexes. No TV manufacturer has the desire to make their product worse than others so they would not go to the expense of building in a system to do as you suggest - even if it were possible to differentiate between the content of different programmes. I compared the Freeview and Freesat transmissions for the recent Monaco Formula 1 race, containing loads of fast movement and transistions and on Freeview there was noticable jerkiness on fast pans but much less so on Freesat - I had two TV sets side by side which I don't usually have. That indicates that the Freeview transmission is more prone to a jumpy appearance during rapid panning, an artifact that was absent with analogue transmissions.
If your VHS recordeder did as you suggest, it was faulty. I worked on a range of VHS recorders since 1978 for a major TV rental company, so have a good understanding of how they worked and what went wrong.
I'm not sure what question you were trying to answer but I can't see any relating to what your saying.
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Nicholas:
I don't get any such 'outlines' artefacts on my TV!
You need to provide supported factual evidence for your claim to stand any chance of being accepted by the technically aware contributors to this website. We are mostly of a scientific and technical breed so look at evidence carefully and usually do not accept heresay.
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Nicholas:
Your posting doesn't make much sense to me as an experienced electronics engineer. Your arguement does not fit with the known facts.
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Paul Reuben Bruney:
Please would you tell us what the signal strengths being reported on your TV are for each of the multiplexes. As yopu are so close to the transmitter, it is highly likely that you have too muc signal, which will cause the problems you report.
If any of the signal strengths is greater than 85% then you need to fit an attenuator into the aerial lead at the back of your equipment. They are inexpensive and available in different 'strengths' so you could start by buying a 3dB and a 6dB. Try each separately to see if there is any improvement. If not, you can sonnect them both in series and try again. If the signal strengths are still above 85%, you can get a 12dB attenuator to try.
Note that if the signal strength shows 0% then you almost definitely have too much and it is 'swamping' your tuner. That assumes you don't have an aerial fault.
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Nicholas:
I'm afraid you are the one who has got it wrong.
Further, a CRT implodes as there is a vacumm inside. When the glass is broken it flies inwards first and then bounces off the other pieces of glass from the opposite side of the tube before expanding outwards rapidly. I was involved at Philips in the sixties in carrying out tests to develop the 'rim band' tubes to try preventing the face glass, which is thicker than the rest, from cracking and hence being a hazard when the implodes.
Please take note of what professionals are saying. Your arguments are technically incorrect.
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Dave:
You need to recheck the 'F' connectors, ensuring that none of the outer braid is touching the inner core.It is always wise to remake the connection taking care to avoid any short circuits.
I assume you mean the LNB (Low Noise Block).
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Friday 2 June 2017 10:48AM
Linda Todd:
There are no currently reported problem with the Darvel transmitter.
Please supply a full post code so that we contributors can check the transmission and reception condition at your precise location, a partial post code is not sufficient as it can vary along a road.