DIYbanter - View Single Post - Audio Precision System One Dual Domani Measuirement Systems

Terry Casey

In article ,
lid says...

On 2/6/12 1:16 PM, David Looser wrote:

The original plan, drawn up in the early '60s, was to re-engineer Bands 1
and 3 for 625-line operation once the 405-line service was switched off; but
it never happened. I guess that the powers that be thought that the spectrum
could be more usefully used for other purposes.

Of course it could, but harmonizing spectrum with the continent might
have been beneficial as well. Have these plans been published?

I don't see how we could harmonize system I channels with the French 919
line channels!

Other western European countries[1] used system B in a 7MHz channel
width and system G in an 8MHz channel at UHF.

To use the same channels we would have needed to devise a system X with
a truncated vestigial side-band to fit our 6MHz sound-vision spacing
into 7MHz - in reality, I don't think it would have fitted!

In practice, if we had decided to carry on using VHF for 625 line
broadcasting, I think we would have harmonised with the Irish 8MHz
channel plan - not least because of the proximity of NI transmitters to
those in the republic.

[1] Belgium also had its own variant of the French 819 line system
crammed into a standard 7MHz channel - it must have looked truly
appalling in comparison to 625!

--

Terry