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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old 16th October 2018, 01:54 PM   #8581
anatech is offline anatech  Canada
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John Curl's Blowtorch preamplifier part III
Hi Ed,
Have a great time at AES!

-Chris
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Old 16th October 2018, 03:45 PM   #8582
DF96 is offline DF96  England
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Quote:
Originally Posted by scott wurcer
How does that work?
I can understand AES having lots of audio engineers and few RF engineers so knowledge of transmissions lines could be thin on the ground there. Not so for EBU: they should have shedloads of RF engineers.

Quote:
Originally Posted by 1audio
In fact the original 1983 specification allowed up to a 2:1 mis-match of the line characteristics and this gave a
certain flexibility to "loop through" receivers, or use multiple links radiating from transmitters.
In the 1980s there was an obsession with 'multi-drop' cabling for all sorts of networking. I guess this coloured their thinking. Somewhere there would have been an engineer saying "that will never work" but his manager told him to keep quiet.

Last edited by DF96; 16th October 2018 at 03:45 PM. Reason: typo
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Old 16th October 2018, 04:05 PM   #8583
Max Headroom is offline Max Headroom  Australia
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Quote:
Originally Posted by simon7000 View Post
The thinking was at a 2:1 mismatch the reflection would drop below the digital threshold. Pretty sure Heaviside (sp) would have disagreed.
Jocko also.....IIRC he stipulated correct matching and particular cable lengths for spdif coaxial.



Dan.
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Old 16th October 2018, 05:08 PM   #8584
PMA is online now PMA  Europe
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Maybe not enough experimental experience at some AES members. Theoreticians tend to underestimate possible practical issues other than those they specialize at.
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Old 16th October 2018, 06:50 PM   #8585
DF96 is offline DF96  England
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I would have thought insufficient theoretical knowledge was the problem. Experimenters tend to underestimate possible practical issues in setups other than those they have already tried. "It worked here, therefore it will work elsewhere in quite different arrangements".
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Old 16th October 2018, 07:41 PM   #8586
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Until you make an experiment yourselves you are unable to evaluate and fully absorb the theory you have studied. Once you made an experiment, you will know and understand forever.
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Old 16th October 2018, 07:57 PM   #8587
simon7000 is offline simon7000  United States
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It was radio engineers who thought the 2:1 would be fine. Unfortunately the quality of audio twisted pair varied way more than normal coaxial cable.
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Old 16th October 2018, 11:47 PM   #8588
hhoyt is offline hhoyt  United States
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John Curl's Blowtorch preamplifier part III
Quote:
Originally Posted by simon7000 View Post
...I am at the railroad train station about to board the Pennslyvanian train to go to the AES in New York.
I ought to go to another AES, I manned both booths and demo rooms upstairs at the NY Hilton for years...and have some great memories of the work...and play.

Have fun, Ed!
Howie,
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Old 17th October 2018, 12:04 AM   #8589
simon7000 is offline simon7000  United States
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Play in NYC? Dine, drink, catch a show, visit friends, oh yeah attend a technical meeting, listen to a presentation or two, visit booths and exhibit rooms, who has time to play?

I don't buy as much as I used to, but folks like me kind of hint to the manufacturers that they might want to be here.
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Old 17th October 2018, 03:22 AM   #8590
nezbleu is offline nezbleu  Canada
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John Curl's Blowtorch preamplifier part III
My second last trip to NYC was to see Arcade Fire at MSG (Spoon opened). The last time I took my daughter to the Metropolitan Opera. Broadway doesn't interest me, but there is a lot of music in NY!
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