Linley Gumm: Difference between revisions
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Revision as of 07:03, 2 September 2021
Linley Ford Gumm (b. Jan 30, 1942 in Spokane, WA – ?) (ham callsign K7HFD) was a Tek engineer 1964-1976, senior engineer 1976-1981, principal engineer 1981-1985, chief engineer from 1985.
He recalls his experiences starting at Tek:
I joined Tek on June 15, 1964 joining the Instrument Evaluation group under Jerry Shannon. The first thing that happened to me was I spent something like the first nine weeks working as a test technician in Plant 2 in Building 39 testing 545B and 647 scopes. I was never very good at it. Jerry put me there to make sure I understood the environment that new products went into. On Sept 21, 1964 I would have been back at the Sunset plant working in the evaluation group (Building 81?) working for Herb England for perhaps five weeks. I was so raw that I cringe at the memory.
Regarding the possible Tek 106 design notes document:
In any case, the only thing on that page that is familiar is my characteristic printed signature. I do very vaguely remember reviewing some small aspect of a new generator that involved floating power supplies. I was blown away at the time by the rather cavalier use of same. It all made sense but it was wildly different from anything I had seen at the time. The design of that generator was well along when I first saw it.
The nomenclature of the "new 105" on these drawings makes it almost certain that this is an early set of Type 106 drawings. The Type 105 was a physically large, high voltage (i.e. approximately 100 volts p-p) square wave generator. It was entirely done out of vacuum tubes so it also made extensive use of floating power supplies. The 106 was a box to replace the 105, reducing its size plus adding the capability of generating lower voltage waveforms with a much faster risetime.
At that time at Tek, the Instrument Evaluation organization was responsible for the design and limited production of equipment used in manufacturing test. Over time some of these products were deemed to be of sufficient quality and interest to be sold to the public as products, if for no other reason than that they were specified in oscilloscope manuals as necessary for calibration. They would start out as 067- test fixtures and then later be given a product ID (I don't know if the 106 went this route). This involved things like time mark generators, sine wave sources, load test boxes, etc. Therefore, a box to replace the 105 would be done in the Instrument Evaluation group. I noted Bill Lukins name on some of the documentation on the Tekwiki web site. I believe he was one of the major players in the 106 development.
(As a completely off-the-subject aside, the 140 color bar generator started out as a 067- test fixture intended to test vector scopes. I have some early front panels of same in my garage. Charlie, of course, fully intended to sell them as a product from the get go but needed to pretend to be doing a cal fixture to get permission to develop it.)
In any case, I don't believe I drew the diagram on that page. At that time I used a template and my resistors had many fewer points. Further, all of the lettering is much better than I have ever been able to do. The only thing I recognize on that page that might be done my me is the 3.9K notation scribbled above R402.
Links
- TekWeek March 27, 1987: Chief Engineer Linley Gumm
- Linley Gumm @ Prabook
- Key Frequency Parameter Measurements And Instruments (1972)
Products by Linley Gumm
| Manufacturer | Model | Description | Designers | Introduced |
|---|---|---|---|---|
| Tektronix | 7L12 | 1.8 GHz Spectrum Analyzer | Morris Engelson • Linley Gumm • Gene Kauffman • Larry Lockwood • Gordon Long • Steve Morton • Paul Parks • Fred Telewski • Neal Broadbent • Jack Doyle • Al Huegli • Steve Skidmore • Leighton Whitsett • Judy Hanson • Robert Holmes • Carolyn Moore • Rena Randle | 1971 |
| Tektronix | 7L18 | 18 (60) GHz Spectrum Analyzer | Linley Gumm • Bob Bales • Russell Brown • George Maney • Carlos Beeck • James Wolf • Dave Shores • Philip Snow • Wesley Hayward • Jack Reynolds • Steve Morton • Don Kirkpatrick • Dennis Smith • Al Huegli | 1978 |
| Tektronix | 492 | 21 GHz Spectrum Analyzer | Larry Lockwood • Steve Morton • Linley Gumm • Robert Alm • Bob Bales • Carlos Beeck • Bill Benedict • Craig Bryant • Russell Brown • Wes Hayward • David Leatherwood • Gordon Long • Dave Morton • Bill Peterson • David Shores • Steve Skidmore • Dennis Smith • Phil Snow • Leighton Whitset • Norman Witt | 1980 |
Components by Linley Gumm
Patents by Linley Gumm
| Page | Office | Number | Title | Inventors | Company | Filing date | Grant date |
|---|---|---|---|---|---|---|---|
| Patent US 5233418A | US | 5233418A | CATV sweep system using a gated receiver | Linley Gumm • Richard T. King | Tektronix Inc | 1993-08-03 | |
| Patent US 4410879A | US | 4410879A | High resolution digital-to-analog converter | Linley Gumm • Steven R. Morton | Tektronix Inc | 1980-10-31 | 1983-10-18 |
| Patent US 4688253A | US | 4688253A | L+R separation system | Linley Gumm | Tektronix Inc | 1986-07-28 | 1987-08-18 |
| Patent US 4728884A | US | 4728884A | Infinite dynamic range phase detector | Linley Gumm | Tektronix Inc | 1986-10-09 | 1988-03-01 |
| Patent US 5068614A | US | 5068614A | Swept frequency domain reflectometry enhancement | Walter D. Fields • Linley Gumm | Tektronix Inc | 1990-11-05 | 1991-11-26 |
| Patent US 5073822A | US | 5073822A | In-service cable television measurements | Linley Gumm • Bill Benedict | Tektronix Inc | 1990-11-19 | 1991-12-17 |
| Patent US 5493209A | US | 5493209A | Tunable trigger acquisition system and method for making in-service time-domain signal measurements | Linley Gumm • Dana E. Whitlow | Tektronix Inc | 1993-10-20 | 1996-02-20 |
| Patent US 5521532A | US | 5521532A | Digital synthesizer controlled microwave frequency signal source | Linley Gumm | Tektronix Inc | 1994-10-06 | 1996-05-28 |
| Patent US 6307896B1 | US | 6307896B1 | Instrumentation receiver for digitally modulated radio frequency signals | Linley Gumm • Jeffrey D. Earls | Tektronix Inc | 1998-04-03 | 2001-10-23 |
| Patent US 6246717B1 | US | 6246717B1 | Measurement test set and method for in-service measurements of phase noise | Xiaofen Chen • Linley Gumm • Dana E. Whitlow • Larry Lockwood | Tektronix Inc | 1998-11-03 | 2001-06-12 |
| Patent US 6275523B1 | US | 6275523B1 | In-service measurement of transmitter nonlinearities | Xiaofen Chen • Linley Gumm • Thomas L. Kuntz | Tektronix Inc | 1998-11-03 | 2001-08-14 |
| Patent US 6477198B1 | US | 6477198B1 | Quality cause measurement display | Linley Gumm | Tektronix Inc | 2000-05-01 | 2002-11-05 |
| Patent US 6437578B1 | US | 6437578B1 | Cable loss correction of distance to fault and time domain reflectometer measurements | Linley Gumm | Tektronix Inc | 2000-11-14 | 2002-08-20 |
| Patent US 6384784B1 | US | 6384784B1 | Direction finder system using spread spectrum techniques | Linley Gumm | Tektronix Inc | 2001-01-05 | 2002-05-07 |
| Patent US 6384589B1 | US | 6384589B1 | Reference frequency spur cancellation in synthesized measurement receivers | Linley Gumm • Thomas L. Kuntz • Xiaofen Chen | Tektronix Inc | 2001-04-04 | 2002-05-07 |
| Patent US 6472945B1 | US | 6472945B1 | Operational amplifier oscillator | Linley Gumm | Tektronix Inc | 2001-04-27 | 2002-10-29 |
| Patent US 6608475B2 | US | 6608475B2 | Network analyzer using time sequenced measurements | Linley Gumm | Tektronix Inc | 2001-08-23 | 2003-08-19 |
| Patent US 6701265B2 | US | 6701265B2 | Calibration for vector network analyzer | Thomas C. Hill • Xiaofen Chen • Soraya J. Matos • Leroy J. Willmann • Kyle L. Bernard • Linley Gumm | Tektronix Inc | 2002-03-05 | 2004-03-02 |
| Patent US 6930563B2 | US | 6930563B2 | Self-adjusting I-Q modulator system | Linley Gumm | Tektronix Inc | 2003-04-18 | 2005-08-16 |
| Patent US 6876261B2 | US | 6876261B2 | Phase lock for synthesizer phase reference oscillator | Linley Gumm | Tektronix Inc | 2003-04-21 | 2005-04-05 |
| Patent US 6768434B1 | US | 6768434B1 | High speed x/sine(x) correction circuit | Linley Gumm | Tektronix Inc | 2003-05-15 | 2004-07-27 |
| Patent US 7519330B2 | US | 7519330B2 | Simultaneous ACLR measurement | Linley Gumm | Tektronix Inc | 2004-03-08 | 2009-04-14 |
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Sunset Building 81
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