John Curl's Blowtorch preamplifier part III

[anatech]

Hi Ed,
Have a great time at AES!

-Chris

 

[DF96]

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.

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.

 

[Max Headroom]

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.

 

[PMA]

Maybe not enough experimental experience at some AES members. Theoreticians tend to underestimate possible practical issues other than those they specialize at.

 

[DF96]

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".

 

[PMA]

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.

 

[simon7000]

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.

 

[hhoyt]

...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,

 

[simon7000]

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.

 

[nezbleu]

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!

 

[DPH]

My second last trip to NYC was to see Arcade Fire at MSG (Spoon opened).

Oh man that sounds like a great concert!

 

[DF96]

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.

Particle physics has only made the progress it has by largely separating theorists from experimenters for the last 50 years. There are very few people who can do both at a competent level.

 

[Mark Johnson]

Semiconductor physics: the opposite . By commingling experimenters and theorists we've stretched Moore's exponential progress curve farther than anybody thought possible.

 

[31697B]

JC..... The Bybee thing ..... is a Quantum resonance device.

-RNM

 

[jneutron]

Semiconductor physics: the opposite . By commingling experimenters and theorists we've stretched Moore's exponential progress curve farther than anybody thought possible.

Nonsense. It's the immersion lithography that did it for the last few years. Which is optical as well as plumbing..

For high energy physics (actually, condensed matter physics as well), co-mingling between the physicists and engineers has proven quite valuable. As the interaction continues and both camps learn through cross contamination, amazing things can be built and run.

At least, that has been my experience.

jn

 

[scott wurcer]

JC..... The Bybee thing ..... is a Quantum resonance device.

I could show you the insides of one not much there, does nothing.

 

[31697B]

Nonsense.

For high energy physics (actually, condensed matter physics as well), co-mingling between the physicists and engineers has proven quite valuable. As the interaction continues and both camps learn through cross contamination, amazing things can be built and run.

At least, that has been my experience.

jn

Mine also. I worked with a guy who had a title of Physics Engineer (PHd).

Did not know there was such a field. He was excited one day and took me from the office over to the building where he had invented a self aligning laser system for something.

Guess he was one who bridged both engineering and physics and understood both well.


THx-RNMarsh

 

[31697B]

I could show you the insides of one not much there, does nothing.

apparently you can measure such affect cheaply and easily? --->

Cheap Body Health Analyzer Mini Quantum Magnetic Resonance Analyzer - Buy Quantum Magnetic Resonance,Cheap Body Health Analyzer,Mini Quantum Analyzer Product on Alibaba.com





THx-RNMarsh

 

[hhoyt]

apparently you can measure such affect cheaply and easily? --->Cheap Body Health Analyzer Mini Quantum Magnetic Resonance Analyzer - Buy Quantum Magnetic Resonance,Cheap Body Health Analyzer,Mini Quantum Analyzer Product on Alibaba.com

THx-RNMarsh

LOLOL,
That reminds me of the Quantum E-Meter I was tasked with analyzing a few years ago: Scientology Mark Super VII Quantum E-Meter | eBay
I won't comment on it here since it has connections to a "religion."

Geesh...
Howie

 

[scott wurcer]

LOLOL,
That reminds me of the Quantum E-Meter I was tasked with analyzing a few years ago.

There are antique stores that specialize in quack medical devices some are quite amusing, a few even dangerous.