The MS-200 is a full featured main station combining an outboard power supply with the facilities to control two independent communications circuits. The 2 rack-unit high (3.50 in.) cabinet is available with rack-mount side panels, plain side panels or side panels with handles. All three configurations are priced the same.

The MS-200 has two independent communications circuits (A & B). The operator may communicate with stations connected to either A or B, or both A and B by pressing the circuit On switches. The two circuits remain independent, and stations connected to one can not speak to stations connected to the other. During rehearsals, or other activities where a single common communications circuit would be desirable, pressing the Link button will accomplish that. Each circuit also has its own combination signal lamp/signal switch which will light all the signal lamps on that circuit when pressed. Thus an operator at the MS-200 can cue or guide two separate groups of personnel who are other wise independent. If preferred, a gooseneck microphone (LSM-2 or LSM-4, sold separately) may be plugged into the front panel head set jack, with the front panel speaker switched On. In this mode, an adjustment of the sidetone null control will permit the MS-200 to be operated fully duplex, hands free, no press-to-talk. The operator may monitor either or both circuits while his/her own microphone (either head set or gooseneck) is turned Off.

A front panel switch diverts the output of the head set (or gooseneck) microphone to a rear panel 600Ω balanced output, permitting paging through a remote paging amplifier, eliminating the need for a separate microphone for this purpose. To activate the remote amplifier, a pair of normally open contacts, accessible on the rear panel, are closed when the Mic switch is moved to the Page position. Individual microphone-level and line-level auxiliary inputs are provided, each with its own volume control. These allow external sources such as program feeds, run-of-the-show relays, paging announcements or other back ground information to be mixed onto the communication circuit(s). Front panel buttons allow the auxiliary signal(s) to be sent to one, both, or neither of the two communications circuits. These inputs are normally unbalanced.

The MS-200 may be fitted with the accessory OG904 Override Generator Card which will permit the operator to override the front panel controls of loudspeaker stations in the system which are equipped with the Override feature. (See the LS-3 data sheet)

Additional circuits may be added to the MS-200 by adding the mating MSM-2 (two additional circuits - C & D) or the MSM-3 (four additional circuits - C, D, E & F). A rear panel D-Sub connector is provided for this purpose.

Extra MS-200ís may be used in a system, deriving their power from the central unit. Simply loop through using the A and/or B rear panel XLRís. An additional outboard power supply is not required in this application.