At 07:44 PM 7/1/2004, [EMAIL PROTECTED] wrote... >When an input to, or output from an audio device is specified as being "line >level", what exactly does that mean? Is it a specific RMS voltage perhaps? >Its a term that I've heard bandied about over the years but either never knew, > >or have forgotten the precise meaning.
A "line out" signal is one which provides a nominal .775 V RMS signal (1 mw into 600 ohms = 0 dBm). Peak level is usually +4 dBm, or about 1.23 volts. It has nothing to do impedance, where it's connected internally, or whether or not there's a means of level adjustment (all things sometimes incorrectly associated with the term). Any signal source which provides, or can be adjusted to provide, that level output can properly be called a "line out." The term "line" originates in telephony, and later broadcast audio (here's a reference: http://www.richardhess.com/be/aes-80.htm ). Mike _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
