CEPD News 
August, 2015 - Vol 8, Issue 6
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IEEE Denver Section Dine and Learn

Signal Processing for Digital Mode Amateur Radio

By David Farrell

If you missed it, Dave will be repeating the talk he gave last month to the High Plains Section- Advances in digital modulation techniques (modes) for amateur radio have progressed significantly in the last couple of decades. The capabilities of real-time DSP within transceivers and personal computers as well as computer control of the transceiver and automatic logging to the cloud, have made the PC transceiver interface commonplace in the ham shack. These methods work well with the narrow channel bandwidth, low power transmission, and low signal to noise ratios present in amateur radio. An overview of methods will be presented. The signal modulation and demodulation techniques of a few popular modes will be examined in depth.

Date: August 11, 2015
Time: 6:00pm - 8:00pm
Rock Bottom "Promenade Room", 10633 Westminster Blvd #900, Westminster, CO
MAP: Click here for Map

6:00 - 6:15 Registration and Appetizers

6:00 - 7:15 Dinner and Networking

7:30 - 9:00 Presentation

Please register as space is limited! (Click Here)
Conductive Ink Printing

     Printed Circuit Boards (PCB's) are usually fabricated on FR4 (a glass reinforced epoxy). You can now print your prototype PCB layout out on paper. Conductive Ink printing isn't a new technology, but introducing the concept using a low cost ink jet printer is relatively new. A team from The University of Tokyo, Microsoft Research Cambridge, and Georgia Tech published a paper in 2013 outlining this process. The process is particularly useful in large area sensors and high frequency applications such as RFID and antennas. These types of printable inks may include materials like silver and carbon in powder or flake form. The inks are usually classified as either Fired High Solid (FHS) systems or the more common Polymer Thick Film (PTF) systems and can be deposited on different types of mediums. Circuits printed on paper usually have components that are placed and held with conductive tape or glue. The ink can be soldered to, but not very reliably at this time. The printed circuits have a good amount of flexibility and can be bent or folded to fit different design constraints. Several companies exist today that sell the ink including Methode and AgiC. If you don't have a printer that supports these types of cartridges, AgiC also sells conductive ink pens and even erasers. For you do-it-yourselfers, there is an article from IEEE Spectrum that outlines how to make these conductive inks and pens. -NS

If you would like help developing a new product or if you find your project understaffed, CEPD can help you meet your deadlines. Our staff draws on years of diverse product design experience to provide creative and timely solutions for your product needs. Some of our specialties include:
  • DSP
  • Embedded Systems Hardware and Software
  • Data Acquisition
  • Wireless Sensor and Telemetry Systems (Zigbee, Cellular, VHF, Bluetooth, ANT+, etc.)
  • Control Systems
  • Programmable Logic: FPGA / PLD
  • Analog Circuit Design
  • Switching Power Supply Design
  • Battery charging (all chemistries)
  • PCB Design and Layout
  • Analysis,Test and Documentation
Our goal is to provide cost effective and expedient design options for our clients. Our services range from an hour of consultation to large turn-key product development projects. We provide detailed proposals, accurate estimates and time schedules to help you manage each phase of the project. We can offer fixed cost or time and materials proposals to suit your specific needs. There is no cost to you for the initial proposal we create and the initial discussion required! 

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