Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: Julian Macassey Newsgroups: comp.dcom.telecom Subject: Re: 500/2500 Handsets Message-ID: <11208@accuvax.nwu.edu> Date: 23 Aug 90 04:04:42 GMT Sender: news@accuvax.nwu.edu Organization: The Hole in the Wall Hollywood California U.S.A. Lines: 26 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 587, Message 5 of 11 In article <11093@accuvax.nwu.edu>, roy@alanine.phri.nyu.edu (Roy Smith) writes: > OK, here's a question that's been bothering me for probably > about 20 years. Why, on a standard 500/2500 handset, does the > microphone just drop in but the speaker have screw terminals? > Well, not only do 500 and 2500 sets have drop in microphones (Transmitters in telco speak), but all Western Electret sets using a carbon transmitter use the same device called a T1. Do not confuse a T1 transmitter with "T1 carrier". The reason for the easy removal of the transmiter is for simple field replacement. Carbon transmitters go bad more often than "speakers", known as receivers in telco speak. The following countries also have drop in transmitters, Denmark, Sweden, UK (old phones) Germany. There are no doubt others that I am not familiar with. Denmark also used to have drop in receivers. Julian Macassey, n6are julian@bongo.info.com ucla-an!denwa!bongo!julian N6ARE@K6IYK (Packet Radio) n6are.ampr.org [44.16.0.81] voice (213) 653-4495