Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!rochester!cornell!uw-beaver!fluke!vince From: vince@tc.fluke.COM (Craig Johnson) Newsgroups: sci.electronics Subject: Vibrator Technology Message-ID: <1293@sputnik.COM> Date: Mon, 20-Jul-87 12:25:24 EDT Article-I.D.: sputnik.1293 Posted: Mon Jul 20 12:25:24 1987 Date-Received: Tue, 21-Jul-87 05:04:21 EDT References: <1468@tekchips.TEK.COM> Sender: news@tc.fluke.COM Organization: John Fluke Mfg. Co., Inc., Everett, WA Lines: 28 Jan Steinman writes: >I remember as a 9th-grader, ripping apart car radios. At the time, my dad >had just replaced the ignition coil on our Ford. Well, I mounted the >vibrator, ignition coil, and two lantern batteries on a small chassis, wired >the whole thing to the striker-plate of the science classroom door, and >closed it behind me. No one could get in for about 30 minutes until the >batteries died. This reminded me of fun device I played with once. Several years ago as a youngster, I found a couple of Korean War vintage radio jammers amongst stuff that had been dumped in the woods. These were army green cylinders about 6 inches in diameter and 24 inches long. They had holders for about 2 dozen "D" cell batteries, a wind-up 7-day, 24-hour cycle timer, a vibrator, a spark gap, RF coils, and 25-50 meter antenna wire. The timer had setable stops which would allow the thing to be programmed to go on and off several times a day. I tried the thing a couple of times and noted that it was a wonder source of broadband static. I never determined if it was actually tuned to any specific band. I was very conscious of the RFI I was creating (even with just a stub of an antenna) and was too concerned about getting into trouble to spend much time trying to analyze the output further. Craig V. Johnson John Fluke Mfg. Co. Everett, WA