Typically, a "600 ohm line" indicates an impedance typical for audio and telco use. The math is a follows. A 1 milliwatt input on a 600 ohm is typically 0.775 volt AC and represent a 0 dB level. This is milliwatt, generated by the telco as a reference signal to determine line loss on a cable pair. The frequency is generally 1004 Hz. In audio applications, this is a reference for amplifier and mixer sensitivity. An amplifier may generate full output with reference to 1mW input on a 600 ohm line, hence 0.775 volt AC, and at 0 dB. The frequency will be at 1000Hz or 1Khz instead of the previously mentioned for telco. Thus, a +4 dB mixing console, which most UK made boards are rated, represents a 1.411 volt AC signal on a 600 ohm line.
On the KX-T, KX-TD series systems the paging output is referenced as 600 ohm impedence, line output. Typically line level output is referenced on a 47K ohm line, for example a tape deck, CD output, etc. and can range from .050 to .100 volts AC. Panasonic references 600 ohms due to the fact that most paging equipment inputs are 47K and going from a lower impedence to a higher one is no problem. Going from a high Z input to a low Z causes major current draw and poor signal and distortion issues. Thus, Panasonic is really providing a good thing on this output, allowing good signal to paging inputs, and if necessary allowing the 600 ohm impedence to be connected to cable pairs for transmission of the paging signal to far locations. Though it would be recommended to use a 1 watt utility amp or similar device to drive the cable pair and reduce line loss. So to answer the original question, the output voltage on the paging output is referenced to a "600 ohm line". "Line" is the key word here, and represents a 50mv to 100mv signal, which Panasonic will be closer or less than the 50mv side of the equation. So endeth the lesson. Steve L. Martin <A HREF="http://www.geocities.com/surfsidesound/";>Surf Side Sound, Inc.</A> multipart/alternative text/plain (text body -- kept) text/html _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
