February 19, 2013

An Interview with Ron Quan - Tenacious Transistor Teacher

1 hour 31 minutes

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Click the above image for the full resolution photo of all the board Ron built for the book!

Welcome, Ron Quan! He is an engineer and the author of Build Your Own Transistor Radios: A Hobbyist’s Guide to High-Performance and Low-Powered Radio Circuits.

Ron got his start working for radio stations: KNEW in Oakland (now in SF) (AM) and KALX at Berkeley (FM)

Prior to that, he grew up playing with #6 ignition battery (dry cell) which is similar to a D cell.

But that's not all, he also built crystal radios (poly varicom) and tube radios (5 tube superhet)

Once he entered industry, it was working on video at Ampex

Later he worked at Sony

Video has a lot of great signal processing problems and challenges. For example, they would sometimes have a 4 mhz bw signal with only a 5-10Mhz carrier!

His first patent was of linearity compensation on B&W CRT TVs at Ampex. However, he has lots of patents to his name!

Dave asked if it was true about Japanese manufacturers removing caps until the products just work; Ron used to put them every other chip, depending on distance between them.

Howard Sam's photofacts is a place to get schematics.

They often had to make their own op amps, using parts like CA3086, CA3054, CA3127

Analog video compensation was done with banks of varacter diodes.

While he couldn't talk about protection schemes, he did talk about (analog) scrambling of audio and video signals.

They would move signals by pseudo random frequency shifting; this is different from the simpler and more common sync suppression method.

Sync suppression could be easily defeated back then, either by DIY solutions or by black market boxes.

Ron went and had to reverse engineer the reverse engineering of some of these boxes coming out of Brazil and Argentina

The Analog Aficionados dinner, hosted by Paul Rako and sponsored by various companies, was last Saturday. Ron and various other high profile analog gurus were there.

Ron published and presented two AES papers which have caused a little bit of a stir; he suggests new ways to measure frequency and develop standards.

He's not an audiophile (in the negative sense of the word) but he has worked for Monster Cable in the past!

The old ways of measuring don't tell the whole picture, such as THD and intermodulation distortion and freq response

Newer methods are CCIF twintone signal (18 & 19 kHz), Transient Intermodulation Distortion or TIM test (square and sine wave) and frequency modulation distortion.

The book was released a few months ago and has gotten great feedback so far!

Chris likes that it gives context and builds to do up front.

The whole thing was done in 26 weeks, including over 25 prototype boards! (see top picture)

We all agreed that this book would be a good fit for a prototyping class.

Thanks to Ron for being on the show! We thought this was one of the most technically dense shows we've had yet, with tons of great industry history and fun stories from throughout Ron's career.

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By The Amp Hour (Chris Gammell and David L Jones)

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