SDM200
RF six audio channel modulator

Description

For more information contact our Data Book www.pasohelp.com

 

SDM200

 RF six audio channel modulator

 

The heart of the system is the SDM200 central unit, which enables six sound signals, generated locally by their respective sound sources (CD players, tuners, multimedia players, etc.) to be modulated and transmitted, mixed on a telephone pair. A pre-amplifying circuit controls the amplitude of the signals from the sources for correct modulation of the relevant carriers, which are generated by a stage that operates according to PLL technology with a quartzed reference frequency. The six modulated carriers are sent to an RF amplifier and then to the output sockets through an RF transformer that achieves balancing and the correct impedance. The SDM 200 modulator is able to supply a constant signal for a maximum of 80 SDP220 receivers. Repeated expansion in multiples of 80 is possible by including one or more SDB200 amplifiers on the signal line.