Check out his website and all of his YouTube videos! His bio follows…
His website can be found at http://www.qsl.net/w2aew/
His YouTube Channel can be found at https://www.youtube.com/channel/UCiqd3GLTluk2s_IBt7p_LjA
My name is Alan Wolke. I am an Electrical Engineer, currently working as an RF Application Engineer for Tektronix – which means I get paid to play with Spectrum Analyzers and other fun RF and high frequency stuff. As a Field Engineer, I am on the road a LOT. Fortunately, I run an FT-857D in the car, so I can be found playing radio during my trips between various customers around the Northest. Former work focused on hardware validation of read-channel circuits for hard disk drives, and also concentrated on applications support for analog, high speed, RF, and backplane/datacom/telecom circuit and integrated circuit designs for various communications and fiber optic applications to well over 10Gb/s, and involved various circuit technologies including Silicon bipolar, Silicon-Germanium HBT, CMOS, and BiCMOS processes, GaAs MESFET and HBT processes, and various 850nm and 1300nm LEDs, PIN photodiodes and Laserdiodes. Shameless self-promotion links: here are links to things I’ve done that are published on the web (at a previous company): Paper 1, Paper 2, Paper 3, Patent (some of the Paper links are broken, since the company has since been bought out…). You can read more about me from my interview as the Featured Engineer on the EEWeb site from 2 April, 2012.
I was originally licensed as a Novice Class in the late seventies while in High School as KA2IZZ. We had an Amateur Radio Club there (Matawan Regional High School in NJ) under the direction of WA2SLK. I dropped out of the hobby when I went to college at NJIT, and then entered the workforce. Some friends at work got me interested in Amateur Radio again (N3GH, K2TW, K4MMG, W2PI), but my renewal privileges on KA2IZZ long since expired. So, I started over as a Technician with the call KC2BOG. After about a year and a half, I upgraded to Tech Plus and bought some HF equipment in September 1998. I applied for the vanity call W2AEW in September also, and received it in October 1998. I spent October working on my CW with some friendly “encouragement” from my friend and co-worker WA2NDH (now W2CSK), and upgraded to Advanced Class in November 1998. So, since my HF privileges are fairly new, I find myself working new states and countries all of the time. Great Fun!!! I frequent many of the local 2m repeaters in central NJ, and spend most of my HF time on 20m and 17m. I tested for the Extra Class license in February 2000. I passed the written test, but missed too many questions on the 20wpm code test (I did better than I thought I would though ;-). So, I became an Extra-Lite or Advanced-Plus after April 15th, 2000 anyway, HI HI!
Other interests besides the radio include MGB cars, RX-8, mountain-biking, NASCAR racing (go Mark Martin!), woodworking, home improvement, and TV/VCR repair (previous life) and of course, diddling around with circuits for fun.
My wife Nancy and I are busy getting settled in our new/old house. We moved in during the summer of 2009, and absolutely love the place. The shack and HF antenna went up in October 2009 – back on the air after a several year hiatus.
This video describes the basic properties of RF mixers, in the context of using them for frequency conversion/translation such in the application of a radio receiver. The input and output signals are shown on the oscilloscope, and the spectrum of the output is also shown, illustrating the various frequency components that are produced by the mixing process. The concept of IF filtering in a receiver is also illustrated. The video does not go into the design of mixers, the different types of mixers, or how to select a mixer for a given application.
This tutorial video gives the basics of the typical amplitude units used on a spectrum analyzer. It gives a basic description of the electronic definition of the decibel (dB), some of the properties of the dB, why it is used. It describes that the dB is a relative measurement. These relative measurements can be expressed as absolute measurements when a known reference is used/implied. This is where the terms dBm, dBu, dBmv, etc. come from. Finally, the term dBc is described. Each of the descriptions is followed with practical examples and demonstrations on an oscilloscope and spectrum analyzer.
I picked up a Tek 1401A Spectrum Analyzer at a hamfest recently, and it inspired me to do a video or two. This one presents a generic block diagram and tutorial of what a conventional swept spectrum analyzer is and how it works. It also shows a quick demo of the Tektronix 1401A Spectrum Analyzer Module from the mid-70’s.
…or, how NOT to blow up your Spectrum Analyzer! This video covers the very basics of how to safely use your spectrum analyzer without damaging it, and how to setup the basic controls to get usable results. It is not intended to be a full tutorial on how to use a Spectrum Analyzer, just enough to allow you to use with without damaging it, and how the “Auto” coupled settings for things like the vertical Attenuator, the RBW and Sweep operate.