kube@cogsci.berkeley.edu.BERKELEY.EDU (Paul &) (01/31/86)
Last year I submitted a request to the net for information on getting a military-type headset to work with civilian radios. No help from the net, alas; but meanwhile I've been able to find out the following: 1. The M87 microphone found on many military surplus headsets is not a bad microphone; it's still used in military applications, and in three commercially available headsets I now know about: AudioCom, Carter Engineering, and Sigtronics models. The problem with it is that it is a dynamic microphone (and a very low impedance one at that: 5 ohms), and your typical GA comm expects a carbon mike. 2. It ought to be simple to build a M87-to-carbon converter with an FET or two and a few passive components, but I wasn't able to find a public domain design. However, each of the companies making M87- based headsets sells a converter, so you can take your pick from the following list. (I bought a couple AudioCom converters because they were cheaper than the others; they also had the best price on replacement microphones. They work, but I don't have anything to compare them to.) AudioCom Electronics 2134 Dickerson Road Reno, NV 89503 (702) 747-5000 Carter Engineering Co., Inc. 232 South Glasgow Avenue Inglewood, CA 90301 (213) 649-0111 Sigtronics 822 N. Dodsworth Avenue Covina, CA 91724 (818) 915-1993 -------------------- Paul Kube kube@berkeley.edu ucbvax!kube