RF Cafe Software
About RF Cafe
1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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Kirt R. Blattenberger
I am NOT looking for a new job.
Please DO NOT contact me.
Performed competitive analysis and report writing regarding power amplifiers, transceivers and front-end modules for cell phones, Bluetooth, WLAN and GPS products
Investigated ESD protection and testing methods for silicon and GaAs MMICs and modules, including IEC61000-2-4, JEDEC and MIL-STD-883
Maintained competitive analysis website on company Intranet
Designed turn-key production test solutions for wireless base station and wireless appliance products in the GSM, DCS, PCS and iDEN™ bands.
Generated electrical engineering portion of test system proposals, including concept definition, cost estimate, labor schedule and customer interface.
Test fixture and system interface design for high volume production environments, including pin probing of circuit boards and design of over-the-air antenna RF couplers.
Performed passive intermodulation (PIM) testing on high power base station components.
Supported design and integration effort on VHF radio multi-port cosite interference cancellation system.
Designed UHF amplifier/filter printed circuit assembly.
Designed and tested VHF switch matrix and amplifier PCA.
Perform system design and analysis on C-, X-, and Ku-Band satellite earth station systems.
Create production assembly drawings and parts lists.
Performed preliminary RF/analog design and analysis of transmitter/receiver chains on S-Band mobile radar system proposal.
Specified, designed, analyzed, ordered parts for, directed building of, documented, tested and integrated RF/analog transmit/receive chain of Multi-Purpose Airport Radar (MPAR) IR&D project. S-Band through baseband up/down conversion using combination of coaxial and waveguide components was accomplished. Interfaces to digital controller circuits included LVDS, RS-422 and relay implementations. High speed PIN switches and attenuators; low noise amplifiers; high precision, low noise opamp circuits; and precision A/D converters were used.
Provided technical support to field engineering effort responsible for initial testing and verification of active element phased array antenna.
Planned and implemented physical integration of radar system areas at local and open air test sites.
Designed and directed building of digital processing equipment rack and RF/Analog equipment rack, including interface cabling.
Initiated and designed Intranet web site for RF/Analog Design Engineering unit.
Maintained CAE software tool upgrades and performed user support.
Performed analysis and designed front end for UHF/L-Band, 4-channel, direction-finding (DF) airborne receiving system including BIT circuitry. Combination of connectorized and discrete components employed in implementation of two chassis assemblies and an 8-layer, surface-mount PCB.
Designed S/C-Band multi-octave front end for 8-channel DF system.
Completed project planning and design of test station to support depot maintenance on a tracking and ranging S-Band receiver employed in the Air Force Satellite Control Network (for AlliedSignal Technical Services Co.). Design of 10 MHz distribution unit, S-Band AM modulator, and creation of an overall testing philosophy were my primary responsibilities.
Founded Waypoint Software in 1992 to market TxRx Designer software.
Conceived of and wrote TxRx Designer software (all versions) in Turbo Pascal. Wrote and published user’s manual. Owner of all copyrights. TxRx Designer is a full-featured frequency conversion and cascade analysis CAE package with a custom graphical user interface.
Created and implemented marketing plan for advertisement in worldwide RF engineering journals. Instituted customer response and order processing system.
Conceived of and wrote EE Ref software in Turbo C++ for Windows. Owner of all copyrights.
Lead engineer for the redesign of a van-based mobile interrogation system used in automated utility meter reading (910 - 960 MHz). Performed system analysis for transmit and receive subsystems. Eliminated long-standing modulation-induced spurious output from transmitter while increasing output power. Designed new low noise front end for downconverter. Specified higher performance Tx/Rx duplexer. Modified receiver cards to improve bandwidth and detector response. Wrote and performed extensive system test and production test procedures. Very successful program.
Served as Design Engineering interface to Manufacturing for production related issues on van-based and handheld units.
Designated test equipment for automated testing in newly formed Engineering Test group.
Responsible for RF and analog design of a Single-Channel-Per-Carrier earth station modem for the Inmarsat satellite system. Incorporated an O-QPSK/BPSK modulator/demodulator for translation of baseband voice/fax/data information to a 70 MHz IF within a dense, multi-layer surface-mount board. Active and passive filters, A/D, D/A, RF amplifiers, PIN attenuators, power splitters/combiners, mixers, and a digital output power level setting with digital leveling loop were employed. Designed monitor/control ELPD. Wrote interface and test software. Thoroughly documented design and production test procedures.
Designed and implemented frequency extension into existing analog transmitter and receiver for Inmarsat M/B system. Performed detailed design verification tests and wrote automated test software for production.
Specified and designed rack-mounted C-Band upconverters and downconverters to Inmarsat specifications. Integrated RF subsystem, SBC, custom interface PCB, and local/remote user interface. Performed system analysis and hardware testing. Created documentation for moving into production phase.
Participated in proposal writing on numerous frequency conversion systems.
Designed Supervisory Control And Data Acquisition (SCADA) installations for electrical substations.
Introduced volume production techniques to facilitate large-scale SCADA installation effort.
Prepared test documentation and trained test technicians.
Worked with engineering team to design programmable, multi-channel airborne L-Band downconverter.
Designed and documented hardware packaging and substrates for hybrid RF, digital, and analog circuits.
Performed system cascade analysis of RF conversion path using OmniSys and custom spreadsheet.
Major RFIC engineering & production company, NC Presently: Applications Engineer
Agilent Technologies, Loveland, CO 7/00 - 8/01: Systems Engineer
Xetron Corporation, Cincinnati, OH 2/99 - 4/00: Senior Hardware Design Engineer
Stanford Telecommunications, Colorado Springs, CO 7/98 - 1/99: Senior System Engineer
Lockheed Martin, OR&SS Syracuse, NY 8/96 - 6/98: Principle Hardware Design Engineer
Harris Corporation , GASD Melbourne, FL 1/96 - 7/96: RF Engineer
System Technology Associates, Colorado Springs, CO 8/95 - 1/96: System Engineer
Waypoint Software, Colorado Springs, CO 11/94 - 8/95: Senior RF Engineer / Owner
Itron, Waseca, MN 11/93 - 10/94: Senior RF Engineer
Comsat Corporation, Clarksburg, MD 11/90 - 10/93: RF Engineer II
Potomac Edison, Hagerstown, MD 4/90 - 10/90: Electrical Engineer
General Electric, AESD, Utica, NY 5/89 - 3/90: Electrical Engineer
Simmonds Precision Instruments, Vergennes, VT 3/86 - 9/87: Sr. Electronics Technician
Westinghouse Electric, Annapolis, MD 2/82 - 3/86
U.S.A.F., Robins AFB, GA 11/78 - 1/82: ATC Radar Repair Technician
National Technological University (NTU) Ft. Collins, Colorado
Some Master’s level classes in microwave engineering curriculum
University of Vermont (UVM) Burlington, Vermont (Spring 1989)
Bachelor of Science in electrical engineering, 3.74/4.00 GPA, Magna Cum Laude
Anne Arundel Community College (AACC) Arnold, Maryland (Spring
Associate in electrical engineering transfer program, 3.6/4.0 GPA
U.S.A.F. Air Traffic Control Radar Repair School Keesler AFB, Mississippi (Fall 1979)
Honor Graduate, 96/100 average
Owner and webmaster of RF Cafe web site (http://www.rfcafe.com), 1996 to present
Atwater Kent Engineering Excellence Award, University of Vermont, 1989.
RF Design Software Contest,
RF Design, 1992 (article in 11/92 edition).
"A Graphical Approach To Mixer Spurious Product Analysis", Wireless Design & Development, 5/96
Here is a photo of the Atwater-Kent Award that was presented to me
at my graduation in 1989 from the University of Vermont.