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405-line VHF bands I and III historic interactive map

To ensure that there is a full history of analogue television here on UK Free TV, a new interactive map showing the transmitters used for 405-line TV has been added.

To ensure that there is a full history of analogue television h
published on UK Free TV

405-line TV was broadcast in two bands, each using 5MHz for each TV channel (except for C1 which was 6.75MHz).

The first band with C1 to C5 was "below" FM radio was from 41.5MHz to 66.75MHz. The second band C6 to C13 was "above" FM radio at 176.25MHz to 214.25MHz.





Please click this map to see more:

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAABlUlEQVQ4y6WTzUtiYRSHn/d67WrTB2Z3JruS9GXO6C6CgVbRPhikZVO7PlZtIqE2gdHHLgiaWU7rdkP/wywmKqilmNoUlFaMlmbhbVHdrmkt9Kzec3jPc37nB0cMrgzrVBGyYlXY+L5cUfPkZghZQtDm1CoCSAhkc+Hy+or8/Z2RWyQLtYqddDZDU50Dq0XmfzZN7u6Wjw3NjyuYAYu/19iLHxq55nAxNTjG3NYS4eAsXzt7Wd5eJ5W55OfY6pMKU4SDIcLBEADzQ9P8GF3hs6sLSQhiyWMAoudxAlrPi4lmgM2qYLMqxtteY8OODc3RylHqmHQuQzJzgd/tM/kA/I3uM/Frlpt8tqxZX7RuYskE0fMEuq4XKZCep31qUBFClAe0eklcnBA5O0KtdxoGGisE3D4CJlnlANl8jj+RHfym6SUmvhUep5sPSi27sQMC7goAkiThc3VR0Av4tWKl8uvP7WobC99m8LZ0FtXHB0Y4vTqjQ/W8D2i019Pf3VeiokP1lDQDyAV04ql/Fd1CAR1R7Tk/AA8+bjTX46YkAAAAAElFTkSuQmCC" class="xico" style="vertical-align:text-bottom" alt="www.ukfree.tv link icon"> link icon
Black and white days, VHF band III television - ukfree.tv - 10 years of independent, free digital TV advice

You can hover over each location to see the BBC or IBA region, the channel used and the power level.



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Comments
Monday, 14 January 2013
Mark Agius
7:26 PM

Re: Briantist
The page looks good, thank you.

My Granddad made the first colour TV.
He had a black and green cathode-ray tube from an old radar display at the end of the war and used it to make a black and green 405 VHF TV.
They used to show fish in a fish bowl between programs, so the fish looked better in black and green than black and white.


link to this
Mark Agius's 307 posts Gold Gold GB
Briantist
9:35 PM

Mark Agius: No problem.

I used to have an amber-screen monitor that connected to a VHS machine (for the tuner) via a long length of cable as to a monitor in the kitchen. The picture quality (as it was unmodulated) was excellent as I recall.

link to this
Briantist's 38,591 posts Owner Owner GB
Saturday, 19 January 2013
T
Tony
4:41 PM

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
Tony's 4 posts GB
Wednesday, 19 June 2013
A
Aerialman
2:28 PM

I notice that in BBC Handbook 1974 that transmitters/tv/Crystal_Palace">Crystal Palace VHF Band 1,Channel 1 was running at 200Kw.But by the time VHF/TV
Transmitters were being switched off in
1982 erp at C P had been reduced to 100Kw.
I would be interested to know why,when and how this was achieved?
Similarly,the IBA Black Hill,VHF Band 3
Transmitter at various times was running
at 300Kw,475Kw and 400Kw.

link to this
Aerialman's 7 posts GB
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