Shure FP42 User's Manual
Contents
1. GENERAL The FP42 is a 4 input 2 output compact self contained stereo mixer for applications in broadcasting recording and sound rein forcement The high reliability FP42 integrates all the operating features of a professional stereo mixer in a single unit small and lightweight enough for location use but with the reliability of a stu dio console FEATURES e Wide flat frequency response low distortion and high output level e Reliable operation under all temperature and humidity conditions e Protected against RF interference and damage from input overload and shorted outputs e Four transformer coupled XLR inputs each microphone line switchable with low cut filters and cuing function e Full separation pan pots with center detent on each input for precise spatial positioning e Phantom power for condenser microphone operation e Built in tone oscillator permits level checking and line testing e Left and right channel transformer coupled XLR outputs with microphone line and mono stereo switches e Parallel stereo headphone jacks 1 4 inch and mini with level control e Left and right mix bus jacks e Active feedback type input gain controls for high level input signals without input attenuators e Adjustable threshold limiter with left and right channel peak indicators e VU meters with range switch and battery check function e Left and right channel master level controls and ganged headphone level control2. e Powered by ac 120 or 240V internally selectable or built in battery pack e Low battery drain provides up to 10 hours operation under normal conditions e Noiseless and automatic switchover to and from battery power e Rugged durable construction e Compact and lightweight for field use and transporting e Rack mountable with accessory rack mount kit e Listed by Underwriters Laboratories Inc listed by Canadian Standards Association as Certified 2003 Shure Incorporated 27A8795 CD Model FP42 User Guide Stereo Microphone Mixer CONTROLS AND CONNECTIONS Power Off On Switch applies power to the FP42 circuitry Channel Level Cue Rotary Controls adjust individual input channel signal levels Each channel can be cued by pulling the con trol knob outward rotating the knob to the desired level and push ing the knob inward to activate the channel Lo Cut Filter Slide Switches reduce unwanted low frequency signals such as wind noise by 6 dB per octave at 150 Hz Pan L R Rotary Controls assign each input channel signal to the left L or right R output channel or equally to each output channel center detent Master Rotary Control determines mixed output level at left L and right R output connectors The control is clutched both channel levels can be set simultaneously or the left inner knob or right outer knob channel can be set individually The control also sets the tone oscillator level when t
3. FP42 at full rated output Use alkaline batteries for maximum life Battery life is approximately 10 hours at 4 dBm continuous use Note that phantom power loading will increase battery drain With batteries in the battery compartment the FP42 will automati cally and silently switch to battery operation should the ac voltage fall below a suitable level Battery condition can be determined by using the Batt Check switch on the front panel With the FP42 power switch on activate the Batt Check switch and observe the VU meter A new set of batteries will give about a 2 VU indication Battery condition is good if the read ing is above 0 VU a lower reading means that new batteries are required for proper operation Note that the FP42 power switch must be turned on to check battery condition Connections Connect the signal sources to the three socket XLR Input connec tors and set the Mic Line switches for the proper level Connect the three pin XLR Output L and R connectors to low impedance micro phone or line level inputs of power amplifiers mixers VTRs etc Set the Output Mic Line switch for the appropriate signal level If desired connect additional FP42s or other mixers using the Mix Bus phono pin jacks A common ground connection can be estab lished using the rear panel Ground binding post Connect the line cord to a 120 Vac 10 50 60 Hz source if the FP42 is to be ac operated If 240 volt ac operation is desired refer to
4. IN HERTZ LO CUT FILTER ACTION FIGURE 1 Note that each input Channel Level control has a cuing capability To cue a channel while the other channels are carrying program material pull the desired channel Level control outward to the cue position This removes that channel from the mixing circuitry and routes it only to the Headphones jacks Adjust the Headphones lev el control to a comfortable listening level and adjust the cued chan nel Level control for a proper mixing level Restore the cued signal to the program mix by pushing the Channel Level control inward The limiter circuit is activated by the Limiter switch With the switch set to In mixer output is limited to the preset threshold level of 14 dBm Increasing the Channel Level or Master gain controls in creases the average output and the amount of limiting To adjust the limiter threshold refer to the Service section With the limiter circuit in the Peak Limiter LEDs light to show limiter action The LEDs respond much faster than VU meters and are ac tivated by extremely short transient peaks but remain on long enough for easy recognition VU Meter The VU meters are factory calibrated for use with a 600 ohm termi nated line The VU Range switch on the rear panel selects either a 4 or 8 dBm output at O VU meter indication This switch changes the meter indication but does not change the actual output level Microphone output levels are 50 dB below line output The 4
5. new batteries are required for proper operation Tone Osc Off On Slide Switch provides a highly stable low dis tortion 1 kilohertz tone for line tests and level checks The tone sig nal level is controlled by the Master Level control The tone signal appears on both the line and microphone outputs as well as the Headphones and Mix Bus connectors The tone oscillator should be switched off when not in use Headphones 1 4 inch Stereo Phone Jack and Miniature 3 5 mm Stereo Phone Jack permit monitoring mixer output through most stereo headphones The Headphones rotary control adjusts Printed in U S A the output level of both left and right channels Note that the head phones output level is high enough for use as an auxiliary unbal anced line feed to drive a tape deck or a power amplifier Input 1 4 XLR Connectors are balanced professional three pin audio connectors Pins 2 and 3 are hot and pin 1 is ground For microphone operation the Input Mic Line switches must be in the Mic position for line level inputs the switches must be in the Line position Phantom Off On Slide Switch controls the application of phantom power for condenser microphones to all inputs With the switch on and Input Mic Line switches in the Mic position 30 Vdc is applied to pins 2 and 3 of each input connector Series current limiting resistance is 3 3 kilohms for each input When using other than Shure condenser microphones verify that the volta
6. fe approximately 10 hours with alkaline batteries at 4 dBm output in continuous use three 9 volt batteries type NEDA 1604A Temperature Range Operating 18 to 57 C 0 to 135 F Storage 29 to 71 C 20 to 160 F Dimensions 79 5 mm H x 310 mm W x 230 mm D 3 1 8 in x 12 7 32 in x 9 1 16 in Weight Net 2 95 kg 6 Ib 8 oz Packaged 3 45 kg 7 Ib 10 oz Certifications Listed by Underwriters Laboratories Inc listed by Canadian Standards Association as Certified ACCESSORIES The Model A16R Rack Panel Kit consists of a 19 in x 3 1 2 in 483 mm x 89 mm precut rack panel and necessary hardware for rack mounting the FP42 with its cover in place and end caps re moved in a standard 19 483 mm rack panel
7. ge and re sistance requirements are compatible Output L and R XLR Connectors are professional three pin au dio connectors for connection to either low impedance microphone or line level inputs of power amplifiers mixers or other signal proc essing equipment The Output Mic Line switch selects either mi crophone or line level output signals Mix Bus L and R Phono Pin Jacks provide direct access to the left and right output channel mixing buses This facilitates stacking or multing FP42s to achieve additional input capacity without los ing any inputs With two FP42s connected at their mix bus jacks for example the left and right mix buses of each unit are directly con nected providing two independent ganged master gain controls and two isolated line amplifiers with eight individually controlled in puts Since the buses are directly connected a 6 db drop in the gain of each output channel will occur and the master or input controls must be increased to compensate INSTALLATION AND OPERATION Battery Operation In addition to 120 or 240 volt ac operation the FP42 can be oper ated from an internal battery pack Current drain is typically 32 mA at 4 dBm output level Battery operation is recommended for re mote on location operation and as an emergency backup source in case of ac power failure Access to the battery compartment is through the bottom of the chassis Three 9 volt transistor radio batteries power the
8. he Tone Osc switch is turned on Mono Stereo Slide Switch selects either monophonic output sig nals both left and right output connectors carry the same signal or stereo operation input channel signals are assigned to left or right output channels depending on Pan control positions Limiter In Out Slide Switch activates fast acting peak respond ing limiter circuit to cut overload distortion during loud program in tervals without affecting normal program levels Peak Limiter LEDS indicate limiter operation with the limiter in and indicate approaching program overload with the limiter out The LEDs are activated by the shortest transient peak but remain on long enough to provide easy recognition L and R VU Meters indicate 0 VU with a 4 dBm output recom mended for normal use to provide approximately 14 dB headroom from operating level to clipping level Rear panel VU Range 4 8 slide switch permits changing to 0 VU 8 dBm The VU meters are lit during ac operation only therefore the illumination serves as a visual alarm if the ac is interrupted and the unit has automatically switched to battery operation Batt Check Momentary Push button Switch operates in con junction with the left channel VU meter to indicate battery condi tion With the Power switch on and the switch depressed a new set of batteries will give about a 2 VU indication Battery condition is good if the reading is above 0 VU a lower reading means that
9. neral Electric Co Type No V22ZA1 SPECIFICATIONS Frequency Response ref 1 kHz 30 to 20 000 Hz 1 3 dB Voltage Gain at 1 kHz OUTPUT INPUT LINE MICROPHONE MIXBUS PHONES PHONES CUE Mic 90 dB 40 dB 25 dB 100 dB 85 dB Line 40 dB 10 dB 25 dB 50 dB 35 dB Mix Bus 55 dB 5 dB 62 dB Inputs INPUT IMPEDANCE at 1 kHz INPUT CLIPPING LEVEL FOR USE WITH ACTUAL at 1 kHz Mic 19 600 ohms 1k 40 to 5 dBV Line Less than 10k 66k 10 to 45 dBV Mix Bus 3 5k 3 5k 0 dBV Dependent on input control setting Outputs OUTPUT IMPEDANCE at 1 kHz OUTPUT CLIPPING LEVEL FOR USE WITH ACTUAL at 1 kHz R 33 dBV min across150 Mic 150 ohms lt 1 ohm ohms 7 18 dBm min across 600 Line 600 ohms 185 ohms ohms Mix Bus 3 5k 3 5k 15 dBV min across 3 5k Headphones 8 2000 ohms 100 ohms 6 dBV min across 200 ohms Noise Equivalent Input Noise 129 dBV low impedance micro phone 150 ohms 300 to 20 000 Hz into 600 ohm load at full gain Equivalent Input Hum and Noise 127 dBV low impedance microphone 150 ohms 20 to 20 000 Hz into 600 ohm load at full gain Output Noise 70 dBV maximum output control full counter clockwise off 55 dBV maximum output control full clockwise on input control down 300 to 20 000 Hz Output Hum and Noise 62 dBV maximum output control down 53 dBV max output control up input con
10. range is recommended for normal use to provide approximately 14 dB of headroom from operating level to clipping level The VU meters are illuminated by a single cartridge type 6 3V in candescent lamp operating well under its normal rating for a life ex pectancy of greater than 10 000 hours The lamp is only lit for ac operation Consequently the illumination serves as a visual alarm if the ac is interrupted and the unit has switched to battery operation The VU meters are connected on the primary side of the output transformer to assure protection from any dc level on a telephone line Telephone interconnection When using the FP42 connected directly to a telephone line check to see whether the telephone company requires an interface cou pler between the FP42 and the telephone line If a coupler is re quired make certain the coupler selected and the wiring arrange ment are in compliance with local telephone company regulations Connect the telephone line to the left or right Output connector and turn the Pan controls so that the entire output signal is on the tele phone connected output or switch to mono operation Telephone Line Surge Protection When using the FP42 connected directly to a telephone line subject to lightning induced voltage surges the following part commer cially available can be installed across the output terminals to pro vide additional protection for output circuit components Metal Ox ide Varistor Ge
11. the Service section Adjustments Turn the Power switch to the On position VU meters will light in ac operation Turn the Phantom switch on if non battery operated condenser microphones are to be used with the FP42 Caution Do not turn the Phantom switch on when using unbalanced low imped ance microphones objectionable hum will result Note that phan tom power cannot be applied to the inputs with the Mic Line switches in the Line position if line level condenser microphones such as Shure s SM82 are to be operated on phantom power contact Shure s Customer Services Department for modification in structions Turn the Limiter switch to Out For each input channel apply an in put signal and rotate the associated Pan control to assign the signal to the left or right output channel as desired Adjust the Channel Level control for each channel so that the VU meter needles move with the audio signals in the 0 VU to 20 VU range with occasional movement into the 0 VU to 3 VU red area With the limiter out the red Peak Limiter LEDs will flicker as the signal level approaches clipping If desired activate the Lo Cut Filter switches above the Channel Level controls The filter action will help reduce wind noise and un desirable low frequency signals such as from condenser micro phones or turntable rumble see Figure 1 RELATIVE RESPONSE IN dB 20 50 100 1 000 FREQUENCY
12. trol down 20 to 20 000 Hz Distortion 0 4 or less THD 30 to 20 000 Hz at 15 dBm output 0 5 or less IM distortion at 15 dBm output into 600 ohms Common Mode Rejection 65 dB minimum with input of 20 dBV at 100 Hz Control Interaction Less than 1 dB with any control combination Overload and Shorting Protection Shorting outputs even for prolonged periods will cause no dam age microphone input will not be damaged by signals up to 3V Separation left and right outputs 40 dB minimum at 10 kHz 50 dB minimum at 1 kHz Low Cut Filters 6 dB per octave rolloff at 150 Hz Limiter Threshold Adjustable 8 to 14 dBm Attack Time 3 msec typical Recovery Time 500 msec typical Peak Limiter Indicators Limiter out lights 6 dB below clipping Limiter in lights at onset of limiter action Phase All outputs in phase with all inputs Pin 2 is high with respect to pin 3 pin 1 is ground Tip of mix bus jack in phase with pin 3 Tip and ring of headphone jacks in phase with pin 2 of left and right outputs respectively Tone Oscillator 1 kHz 18 dBm maximum at both outputs with Master level full up Phantom Power 30 Vdc nominal 3 3k series resistance automatically disabled with input switch in Line position Operating Voltage Ac Operation 120 or 240 Vac 10 internally selectable 50 60 Hz 6W Dc Operation 27 Vdc nominal at 30 mA typical no signal 32 mA typical at O VU 4 dBm output 21 5 Vdc minimum battery li
Download Pdf Manuals
Related Search