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The
Northland Antique Radio Club

in conjuction with
The Pavek Museum of Broadcasting

Presents
The 14th Annual Radio Workshop

Sunday February 3, 2002 at 1 PM


So, the old Scott sounds pretty good? Someone else claims his Stromberg Carlson is even better. What about that Philco 690 or McMurdo Silver Masterpiece? No, we won't be doing comparative analysis on these radios this year, but we'll show you how you can do it on yours.

The first half of the program will focus on the fine points of frequency response and distortion analysis. We'll plot a response curve and make fundamental distortion and output power measurements using basic test equipment. We can also do some acoustic testing to find the limits of our own hearing.

Then we'll move into some high-end applications using the Museum's Hewlett-Packard 334 distortion analyzer. I hope to finally find out the difference between harmonic and intermodulation distortion.

We'll wrap-up to the first half of the program using the Bruel & Kjaer Artificial Ear to compare the output characteristics of a 1938 Zenith 12S265 to one of the Museum's new Diva 2.1 loudspeakers.

After a short break and refreshments furnished by the Northland Antique Radio Club, we'll move on to part two of the program: Impedance Measurement and Matching.

How many times have you wished you could just look in your junk box and find the right output transformer for one thatís burned out in your radio? Well now you can.

We'll show you exactly how to figure out what to look for and how to measure the impedance of those unknown transformers. Bring your calculators and scratch paper!

The workshop will be held at 1PM on Sunday February 3th, 2002 at The Pavek Museum of Broadcasting, located at 3515 Raleigh Avenue, St. Louis Park, Minnesota 55416.

Admission is free to all current Pavek Museum and NARC members (and immediate family members). Membership forms will be available for anyone wishing to join the club.

Don't forget, if it's nice outside, people will start showing up around 10 AM for the outdoor trunk sales. I'll get in around noon to open up the Museum. Look forward to seeing you then!

Steve Raymer


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