M609 — Remote sensitivity and DA

5A14-101 AUDI0 DISTRIBUTION AMPLIEIER Quteut The actively balanced power ou tput stage made up two amplifiers Integrated circuit along with through 05 make the lower half the power output amplifier while u3 along with through 010 make up the upper half _ The output capability this power amplifier excess watts and appears Pins and the assembly connector 2 1/2 The output from this amplifier drives the 600 ohm splitter networks located on the SA14-O66A/B/C assemblies Offset adjust controls R31 and R49 are used trim offset voltage err- ors the amplifier output zero These controls are set give an output DC offset voltage less than Mv when no audio signal present Power_Supely The power supply, integral the SA14-101 assembly , derives its AC voltage (appearing pins and 22 the assembly connector) from the external power transformer T201 mounted the chassis the m6o9 Bridge rectifier CRS along with C31 and C32 rectifies and filters the AC voltage providing nominal +/-32 volt DC output These voltages drive the power output stage the SA14-101 directly as wel/ as appearing connector Pins and for the purpose powering the external SA8-117 Indicator Driver Assembly The +/-32 volt DC voltages are further decoupled and regulated by u4 and u5 along with C35 and C36 This provides precison +/-18 volt DC regulated supply voltages operate the integrated circuit amplifiers and the M208 remote attenuator the SA14-101 Amplifier Assembly The +/-18 volts should be within +/-0.25 voits the nominal value for correct operation the amplifier 1-2

MFG MFG PART_NUMBER Resistor 1/2w 59 300 300 300 300 Philips R2 R3 RL WBS recommends the use replacement parts made by the specified manufacturers for continued optin mum equipment performance SA14-O66A/B/c 1-1

M6og REMOTE_SENSITIVITY AUDIO DISTR IBUTION AMPLIFIER Gain: +30 ~30 dB continuously variable. Frequency Response +/ - 0.2 dB 20 Hz to 20 kHz . Noise: +30 dB gain: Greater than dB below +8 dBm unity gain: Greater than 80 dB below +BdBm (measured over 20 Hz kHz BW) Harmonic Distortion: Less than 0.357 THD from 20 Hz 20 kHz .

Less than 0.1% kHz Measured unity gain up +24 dBm output level with eight outputs simultaneousiy driven . Input Level dBm dBm nominal for +8 dBm output, +24 dBm maximum unity gain. Input Impedance: 30 , 000 ohms greater, balanced Source Impedance: 600 ohms or less, balanced unba anced Common Mode Rejection Ratio: Greater than dB Common Mode Voltage: 60v peak maximum: Output Level dBm nominal +24 dBm maximum eacn output, outputs maximum simultaneously driven .

Output Impedance: 500 ohms resistive at each output, actively balanced. Load Impedance: 600 ohms balanced for each ou tput. Output solation: dB greater

M609 REMOTE SENSITIVITY AUDI0 DLSTRIBUT ION_AMPLIFIER Control wire, up 1000 feet with 5k linear potentiometer as the control ling element Phasing: The low terminal number the input pair and the low termina number the output pair are phase. Power Requirement: 115V AC +/-10%50/60 Hz, 25VA _ Ambient Temperature: 50 degrees Celsius. Dimension: wide (86 mm 3.4" high mm 348 mm) deep Weight: Ibs .

oz . (1.70 Kg. net _ 1-2

M609 REMOTE SENSITIVITY AUDIO DISTRIBUTION AMPLIFIER The M609 plugs directly into the WBS MF6 series mounting Trame which may be installed standard EIA ninteen inch equipment rack The MF6 frame wili accommodate maximum five M609 distribution amplifiers any combination single multiple width modules not exceeding ten single width units the mounting frame has been procured without receptacles, these must be installed the appropriate module positions.

Each M6o9 module requires IWo type MFR6 receptacles Note that the receptacle containing the ac Iine voltage input, inverted provide the mechanical polarization necessary prevent inadvertent insertion other companion modules which not operate from the ac power Tine_ Where vertical rack space permits and the ultimate noise and crosstalk performance desired recommended that only modules the same type be allocated each individual mounting frame Alternatively, possible mix modu different types by exercising extreme care separate cables carrying different levels and functions Place al| ac-powered units the right the frame viewed from the front.

The ac power wiring should dressed along and above the amplifier connectors This minimize the induction the ac power Iine into the audio circuits To reduce the possibility coming contact with the primary power source during serv ice all terminal connects should be covered with hea shrinkable tubing or Hellerman type sleeves Th M609 remote sensitivity feature may be used by adding wire remote controlling ement up 1000 feet from the amplifier Sk Iinear potentiometer should be used as the controlling element such Js WBS #10-008 WBS #10-037/3 type control) .

Adding 1000 feet cable on the remote potentiometer wili result gain/loss error approximately +/-1 dB between the Iocal and remote conditions The arm the remote potentiometer should connect P2 pin the M60g connector while the common the remote potentiometer (clockwise end) connects P2 pin the M6o9 connector should be noted that shielded audio cable such as Bel den 8451 be used for the remote control Iine This minimize the possibility induced voltages affecting the remote gain adjustment the amplifier.

Shield this cable as illustrated on drawing B609-02-002 3-1

M609 REMOTE SENSITIVITY AUDIO DISTRIBUTION AMPLIFIER the remote control Iine left open the amplifier gain wili minimum (less than dB)_ Similarily the control Iine becomes shorted the gain will go maximum (+30 dB) . Wiring the m609 distribution amplifier should be divided and cabled into three separate groups: audio inputs control _ audio outputs. This ensure minimum crosstalk various audio and control signals _ and interference from the Optiona knobs may be added the M609 front panel sensitivity control and Ioca | emote selector Refer parts list for the selection the appropriate components 3-2

M609 REMOTE SENS Tivity AUDI0 DISTRIBUIION AMPLIFIER Shown below chart control voltage versus gain measured between P2-2 and P2-10 the module connector GAIN JB +30 +20 +10 -40 50 16.6V Note: With the remote control Iine open amplifier gain wil greater than dB with the control vol tage increasing +16.6 volts_ 3-3