Linley Gumm

Linley Gumm

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)

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