B+W Telerecordings in Colour - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

KeithsTV · 11th Jun 2008, 1:02 pm

Would you be interested in a scan of the August 76 article in Television? I can scan it and post it later today if anyone is interested.

Keith

2Bdecided · 11th Jun 2008, 1:23 pm

Yes please Keith!

Cheers,
David.

ENGLISH VICTOR · 11th Jun 2008, 1:41 pm

2Bdecided, yes you are quite correct in your assumption that the picure will tend to hold over an entire field, this is due to the xtal having a very high Q and by definition behaves rather slugishly and tends to ignore the periods of non chroma , that is it does not wander far off frequency. It is of course possible to fix the colour uncertainty by suitably synthesised reference signals derived from V and H sync however multiplying up from H rate to Fsc and maintaining phase coherence was fraught with problems back in the early 70s, at least for me it was. I think I addressed ppppenguin's remarks on the 9th and 10th of March this year, albeit a little tongue in cheek.
Victor

KeithsTV · 11th Jun 2008, 6:45 pm

Here's the scanned article on Chromalock decoding.

Keith

2Bdecided · 12th Jun 2008, 10:50 am

Many thanks Keith. That makes it crystal clear!

Cheers,
David.

11th Jun 2008, 1:02 pm	#21
KeithsTV Nonode Join Date: Aug 2007 Location: South Bradford, West Yorkshire, UK. Posts: 2,573	Re: B+W Telerecordings in Colour Would you be interested in a scan of the August 76 article in Television? I can scan it and post it later today if anyone is interested. Keith

11th Jun 2008, 1:23 pm	#22
2Bdecided Retired Dormant Member Join Date: Jun 2008 Location: Bedfordshire Posts: 6	Re: B+W Telerecordings in Colour Yes please Keith! Cheers, David.

11th Jun 2008, 1:41 pm	#23
ENGLISH VICTOR Hexode Join Date: Feb 2008 Location: Sydney, Australia Posts: 356	Re: B+W Telerecordings in Colour 2Bdecided, yes you are quite correct in your assumption that the picure will tend to hold over an entire field, this is due to the xtal having a very high Q and by definition behaves rather slugishly and tends to ignore the periods of non chroma , that is it does not wander far off frequency. It is of course possible to fix the colour uncertainty by suitably synthesised reference signals derived from V and H sync however multiplying up from H rate to Fsc and maintaining phase coherence was fraught with problems back in the early 70s, at least for me it was. I think I addressed ppppenguin's remarks on the 9th and 10th of March this year, albeit a little tongue in cheek. Victor

12th Jun 2008, 10:50 am	#25
2Bdecided Retired Dormant Member Join Date: Jun 2008 Location: Bedfordshire Posts: 6	Re: B+W Telerecordings in Colour Many thanks Keith. That makes it crystal clear! Cheers, David.