Timothy Cash410-507-6824 ; cash.tim@gmail.com; https://www.linkedin.com/in/timcash

Technical Summary: Senior Lead Engineer: Radio Frequency, Microwave, Cellular, Optical Fiber, Wireless, Satellite, striving to deliver top of mind service to my customer across diverse challenges in government/industry.

Optimal Solutions and Technologies Nov 2013-June 2016 Simulation of satellite interference from cellular network builds (NOAA), and the

simulation of Navigational Aid (DME/VOR) Field Strength levels CONUS-wide (~1000 locations, five altitudes, 800,000 point files with LAT, LON, Altitude, Field Strength in dB uV per meter) (FAA).

Generated graphics, big data products, processed large data files using Matlab to quantify field strength of signal in space.

Performed flight tests across multiple VOR sites and varying terrain and propagation conditions, generated large data sets, and final report delivered in support of VOR-MON contract.

Alion Science & Technology Aug 2012-Mar 2013 Performed Interference simulations for LTE Cellular User Equipment and Base Stations

affecting satellite down links for Government customer in L-Band, S-Band. Tools (Visualyse, Excel, MATLAB).

Provided technical support to NOAA in support of Ground Station Interference analyses, determination of harmful levels of RFI from LTE cellular network.

Analyzed NTIA RADAR model in MATLAB to determine L-Band, S-Band interference from LTE onto satellite down link at multiple sites; Analyzed Federal Earth Station RF antennas and equipment in L and S Bands to determine level of performance; managed code for simulation effort.

Provided spectrum support to government/military customers.

Orbital Sciences Corp. May 2011-Aug 2012 Provided technical support to NASA on SCNS contract for the Blossom Point, MD TDRS

Ground Station Antenna acceptance tests. Conducted RF performance characterization measurements (S-parameters, group delay,

axial delay, sub reflector polarization measurements in anechoic chamber) using vector network analyzer, spectrum analyzer and other RF test equipment.

Provided RF Engineering support to two main space to ground link 20 meter antennas, single 5 meter end to end test antenna, installation and support of optical fiber communication links, computing platforms, wireless links (WiFi) and weather station equipment, writing purchase orders, and building a wooden template to repair a bolt circle alignment error for the 20 meter space to ground antenna at Blossom Point.

Consultant to multiple clients June 2009-Mar 2011 Performed coverage testing for 490/800 MHz Public Safety bands in DC subway tunnels. Designed over water wireless mesh (802.15.4) network for Northern Alberta Canada. Exploited (reverse engineered) IED VOIED/RCIED devices to find insurgents. Subject Matter Expert to Bahrain microwave network, multiple sites: Installation/test/cut-

over oversight for Bahrain Defense Force/US Marines. Supported Digital Radio, Channel Banks, RADAR RFI mitigation, microwave link budget/quality metrics using analytical tools for verification; planned installation, test, and cut-over of core/access equipment; provided installation support, and troubleshot sites on a circuit by circuit basis.

SEB Technologies, INC Sep 2006-May 2009 Analyzed EW emissions platform effect on active RFID hardware, Yuma, AZ. Directed baseline test & evaluation and simulated RF waveforms in support of ISO

18000-7 migration. Analyzed Iridium packet latency through Hawaii Gateway server; drafted code to conduct

network testing. Supported field test of cognitive RFID satellite gateway tag/reader. Performed RF Hazards Ordinance Testing for RFID, NSWC, Dahlgren, VA. Analyzed advanced wireless mesh using Zigbee, RTLS (real time location systems),

UWB. Performed frequency supportability analyses supporting spectrum allocation DD Form

1494. Plan, write test procedures and conduct requirement verification tests. Drafted

statements of work, architecture plans, business development, proposal efforts, concept of operations, baseline test plans, communications diagrams, strategic briefs, and white papers to support satellite and wireless mesh back haul (Zigbee, UWB) communications architectures.

Provided RF expertise supporting ISO 18000-7 technical reviews, verification testing. Led testing of next gen active RFID equipment (ISO 18000-7) at US Navy EMC test

facility, examined spurious emissions (Real Time Spectrum Analysis) and RF interference; measured, identified, and resolved multiple potential source(s) of interference.

Consultant to multiple clients 2006 and Prior Multiple products and service contracts: Star tracker test station design. Optical test set (passive optical fiber component test). Multiple site surveys. Cable/connector assembly validation. EW engineering HC-130 military aircraft. C4ISR perimeter defense system (optical surveillance network on US Air Base). Network communications system upgrades. Conducted MIL-STD-810F testing (shock, temperature, thermal cycle, radiation, outgas,

vibration) for International Space Station optical fiber payload, one month delivery to NASA.

Multiple Element Integrated Test (MEIT) on International Space Station Truss Elements. Built/tested prototype impedance test set with remote subscriber pair verifier (SPV) for

central office. Installed optical fiber network routes for East Coast first tier and second tier cities.

Designed, installed, tested, dual ring OC12 private optical fiber network, utilized CAD, Excel spreadsheets and hand calculations to verify link budget, bandwidth and availability metrics; Managed network database of communication circuits $30M.

Managed prototype All Optical Towed Array (AOTA) marine geophysical streamer cable team, conducted successful sea trial of five sensor all optical towed array prototype.

Wrote expert system for cable design (SPICE Model), 50,000 lines FORTRAN, BASIC, DB II; verified algorithms against actual cable test data, matched within 5%.

Designed optical fiber cables, sensors and video links for harsh environments. Managed optical and computer experiments first four space shuttle missions.

EDUCATIONBA-Physics/Mathematics, Indiana University, Bloomington, IN64 Hours graduate coursework in Optics, Electrical Engineering, and Physics.