Phasor Analysis and Baba Yaga’s Hut

Click here to download documentation on the current revision of our demo for the 2018 HamSCI conference. This is a version of the phasor demo developed for this semester’s modulation course, EECS 351.

Abstract:  A laboratory exercise is presented for the examination of analog signals simultaneously in the time, frequency and phasor domains, as well as demodulated audio. A simulated transmitter, transmission medium, receiver front end and in-phase/quadrature demodulator are constructed using function generators, two oscilloscopes, and RF components. In this initial exercise, the focus is on the examination of an AM signal, which students vary in modulating frequency, amplitude, depth, etc. while making guided observations of the effects on each representation. This develops experiential understanding and intuition for examination of AM signals in the 3 domains, and offers a kinesthetic demonstration of concepts typically presented as blackboard exercises. The demonstration is extensible to frequency and phase modulation and QAM, and may form the basis for a semester course in modulation. The exercise has been successfully deployed in a junior-level electrical engineering class focusing on signal modulation. This work is supported by the Electrical Engineering and Computer Science department of Case Western Reserve University, through the Robert E. Collin Radiofrequency and Communications Laboratory and the Case Amateur Radio Club, W8EDU. Educational canon, including bill of materials, setup instructions, and lab exercises for this demonstration, is available at

HamSCI, Day 1

After a long but rewarding drive to the Garden State, we have enjoyed the first day of the HamSCI conference. Data from the Solar Eclipse QSO party is nearing publication, and the talks today were filled with many pretty graphs. Our gracious hosts at the New Jersey Institute of Technology have promised to show us their ham shack tomorrow, and we will demonstrate Baba Yaga’s perspective on the argand plane with an apparatus adapted from our lab exercises in EECS 351. Many thanks to Nathaniel Frissell W2NAF for putting this wonderful event together.

-Kristina KD8OXT; Rachel AC8XY; Nathaniel KB1QHX; Paula KD9GYF


FB at HackCWRU

Was pleased to run into a fellow ham – Jonathan N8JWS of the Youngstown State University amateur radio club, K8YSU – in the typing competition at the CWRU Hackathon this evening. Many thanks to N8JWS for letting me use his keyboard in the contest. We’ll soon be logging contacts on Cherry switches.

-Kristina KD8OXT

“FB” = “Fine Business”

Making Contacts

School Club Round-Up is going well this week. It’s a particular joy to make UHF/VHF contacts with hams around campus. If you’ve gotten your callsign with us, call on 146.55 or 432.1 MHz. We’re listening!

School Club Roundup!

School Club Roundup is coming up Feb. 12-16, and as ever W8EDU is looking forward to making contacts both on the air and with new participants! If you need to get in touch, the shack phone number is (216) 368-3579. There are a lot of ways to be involved, so come drop by (directions here).

-Skylar, KD9JPX

Engineering Challenge Carnival

Nathaniel KB1QHX and I had a grand time at the Engineering Challenge Carnival in Thwing, hosted by the Gelfand STEM Center. We tested our Morse code skills, did some foxhunting in the ballroom, and got in some good testing for our in-progress go box.

If you’re visiting our website because you picked up a QSL card at the carnival today, welcome! Scroll down to see our adventures, and check out the “Contact” page for directions to visit us.

-Kristina KD8OXT