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G0TEZ > HDTV 14.10.11 07:03l 68 Lines 2640 Bytes #999 (0) @ WW
BID : 210047G0TEZ
Read: GUEST
Subj: Re: VK6BE > TV standards,
Path: IZ3LSV<IK2XDE<HB9TVW<DB0ANF<CX2SA<UA6ADV<GB7CIP
Sent: 111014/0007Z @:GB7CIP.#32.GBR.EU #:14959 [Caterham] $:210047G0TEZ
From: G0TEZ@GB7CIP.#32.GBR.EU
To : HDTV@WW
Hi Bob and anyone else interested.
You are quite right, you have not exactly adopted British standards. I
went hunting for my old Newnes Video Engineers pocket Book which has
systems and standards for all over the world.
We have PAL I colour with an overall bandwidth of 8MHz and a sound
subcarrier at +6MHz FM.
Oz has (or had) PAL B colour overall B'width 7MHz FM sound at +5.5 MHz.
NZ has the same BTW.
It means you could watch UK analogue TV but with no sound unless you used
two TV sets.
As all the digital sysems seem to be based on the original analogue, it
should be the same.
As I said in a previous bull: all my TVs and associated equipment have the
facility to view SECAM but viewed on a PAL rcvr SECAM gives a mono picture
with no sound. The US NTSC can be viewed on a PAL rcvr too but it usually
has an overall bluish cast, no sound and a very poor picture.
For what it is worth both Canada and the USA have NTSC M with sound at
+5.5MHz.
We both use(d) 625 line systems, while the US and Canada used 525 but a
good line hold could cope with that.
The book I have just looked at is old and dusty but it is still relevant.
I have a much newer book which is all about the evolution of digital
systems.
They all seem to be based on their original analogue. As for DVDs, I
expect you know that they are all marked with the regions they can be used
in but it is easy to download software which will change the region before
copying the foreign DVD to a Blank one and putting that in your DVD
player.
WE used to have to suffer the same trouble you got with our CH 2 BBC. In
the summer months we would get Gereman and Czechoslovakian programmes
wiping it out. In the mid 60s we went around changing all the TV sets BBC
from Ch2 to CH 12 (Band III) and this solved the problem. It was very easy
as, back then, most TV sets had Cyldon tuners so it was just a matter of
changing the CH2 biscuit for a ch 12 one leaving, hopefully, a happy
customer.
Sadly, not long after that episode, we got the Apollo missions when
customers would start to complain about the poor quality of the pictures
from spacecraft. Just how do you tell someone who is technically
illiterate that the pictures were coming from up to 250,000 miles away in
one TV system, then being translated to another system before being beamed
by satellite across the Atlantic to be translated into yet another system
?
We just used to tell them that the Yanks werent very good at TV and leave
it at that. :-)
73 - Ian, G0TEZ @ GB7CIP
Message timed: 01:02 on 2011-Oct-14 BST
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