All posts by Tony Carter
Below are all of Tony Carter's postings, with the most recent are at the bottom of the page.
The other quite interesting thing about 405 line TV was that the line frequency was 10.125 Khz, so even older people with slightly reduced high frequency hearing could hear the line scan whistle very clearly. I well remember tv control galleries from the mid 1960 with about 20 or so 405 line monitors all screaming out the line scan at 10.125 Khz. Deafening!!
When 625 line came in the line scan frequency rose to 15.625 Khz and most people couldn't hear it.
| link to this comment |
Many thanks for this excellent terrain plotter Brian, and here's a useful bit of advice for anybody living in hilly districts. I first tried it using my postcode, and it said my path to Crystal Palace was obscured which I knew was wrong as on a very clear night I can see the strobe light at the top of the mast flashing - at a distance of 58km. I then entered my OS grid reference and it correctly says the path is clear. Out in the country, postcode areas can be quite big and in my case the altitude of my location is 230 metres, but the altitude at the bottom of the lane over a mile away is 150 metres but has the same postcode! Crystal Palace is definitely obscured there. So the moral is: in hilly areas look at the OS map and use the actual grid reference of your location. (SP858039)
| link to this comment |
Wednesday 22 June 2011 12:46PM
I absolutely agree with Andrew above. I have a Sony integrated Freeview tv (standard definition), the picture quality of which I've always thought was very good, particularly as regards image sharpness. I recently plugged a neighbour's Freeview set-top box into a scart plug on the back of my tv and couldn't believe how poor the picture looked by comparison. The lack of picture sharpness was incredible, as was the "blocky" looking nature of the picture particularly in the darker tones. Maybe cheap Freeview boxes just produce all the required channels without regard to the quality of the signal processing. I tried 3 different scart cables, one of which was an expensive "high-quality" one, but the picture always looked massively inferior compared with my integrated Freeview receiver.