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MLW-1 Manual post 1995 - 45kb - PDF

1. The next steps set up the Silence and Polarity detectors 10 Follow steps 1 and 2 to connect the oscillator to the MLW 1 11 Set the oscillator to a level of 12 DBM 12 Attach the negative input lead of the DVM to the negative lead of C209 in the power supply 13 Attach the positive input lead of the DVM to the cathode side of D133 lower middle of audio board 14 Adjust R266 to the point at which the voltage measured at D133 drops to less than 1 volt this point will switch between about 5 VDC and about 0 volts 15 Connect the HIGH of the oscillator to the of the LEFT Channel of the Source 1 input and the of the RIGHT channel of the Source 1 input Connect the LOW of the oscillator to the of the LEFT and the of the RIGHT channel input inputs are now fed out of phase 16 Set the oscillator to a level of 10 DBM 17 Adjust R273 to the point at which the voltage measured at D133 drops to less than 1 volt this point will switch between about 5 VDC and about 0 volts R266 adjusts the in phase silence trip point and R273 adjusts the out of phase silence trip point By setting R273 slightly less sensitive than R266 the POLARITY setting will be automatic Again as with the LOSS OF CHANNEL detectors if the input level is set to 8 DBM and the in phase silence trip point is set to 12 then the silence sense occurs at 20 DBM This relationship holds true regardless of changes in the settings of SW1 or SW2 ADJUSTMENT
2. off off off off on on on on off off off off on on on on 4 off off off off off off off off on on on on on on on on TIME DELAY SECONDS IMMEDIATE 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 TIME DELAY FOR SILENCE SENSE ACTION alternate source and alarm only SW 5 positions 5 through 8 control the time delay in 15 second increments based on the binary position times 15 seconds The following table represents the approximate delay for specific switch positions SW 5 SWITCH POSITIONS 5 off on off on off on off on off on off on off on off on 6 off off on on off off on on off off on on off off on on 7 off off off off on on on on off off off off on on on on 8 off off off off off off off off on on on on on on on on TIME DELAY SECONDS 195 210 225 240 1 minute 2 minutes 3 minutes 4 minutes NOTE The MLW 1 is factory shipped for no sequence on loss of channel it will always bring up an alternate channel on loss of channel unless programmed for alternate source on loss of channel The MLW 1 is also programmed for no sequence on silence sense The MLW 1 will always alarm after silence is sensed after the programmed time delay This delay is factory preset for 60 seconds In other words all of the switches on SW 3 are open off and only SW 5 5 and SW 5 6 are closed on Add
3. Input Reserved 31 Input L R on M 13 Input STEREO FREEZE A 32 Output LED R L R 14 Output LED L R L R 33 Output LED L L R 15 Output LED Group Indicator 34 Output Bounce Mode Active 16 Output Auto Manual 35 Output POLARITY ALARM 17 Output Source 3 active 36 Output SILENCE ALARM 18 Output Source 2 active 37 Output CHANNEL LOSS ALARM 19 Output Source 1 active A Automatic mode control only M Manual mode control onlyA M Either Automatic or Manual mode control LED channel output indicators are encoded using the following table PIN 15 PIN 14 PIN 33 PIN 32 LOW L R Left Right HIGH L R L R L R Pins 14 33 and 32 are active HIGH TTL outputs and correspond to the level of PIN 15 Only one output pin 14 33 or 32 will be active at any given time The following is a complete description of the function of each of the REMOTE I O pins numerical order PIN 1 Analog common used for the buffered audio outputs only PIN 2 Analog common PIN 3 Analog common PIN 4 Analog common PIN 5 Analog common PIN 6 Analog common PIN 7 Digital common used for digital input and outputs only PIN 8 Auto Manual This input is used to remotely put the MLW 1 into Manual if it is in Automatic and into Automatic if it is in Manual Connect to pin 7 to activate PIN 9 Source 3 On This input is used in either the Manual or Automatic mode to put Source 3 on Because of this Source 3 can override either Source 1 or So
4. MLW 1 will check for audio on Source 1 If Source 1 also has audio then the MLW 1 will transfer back to Source 1 from Source 3 ONE TWO LOOK AHEAD ON ON TWO BOUNCE OFF When silence occurs on Source 1 the MLW 1 will wait for the time delay then look at Source 2 for audio If there is no audio on Source 2 then the MLW 1 will transfer to Source 3 and wait for audio to return to Source 1 or Source 2 As soon as audio returns to Source 1 or 2 then the MLW 1 will transfer back to Source 1 or 2 which ever is active If Source 2 has audio when Source 1 was initially silent then the MLW 1 will transfer to Source 2 ONE TWO LOOK AHEAD OFF OR ON ON TWO BOUNCE ON When silence occurs on Source 1 the MLW 1 will put Source 2 on regardless if there is audio present on Source 2 or not The MLW 1 will then wait for audio to return on Source 1 When audio reappears on Source 1 the MLW 1 will transfer back to Source 1 ALWAYS TEST THE MLW 1 PROGRAMMING BEFORE PUTTING IT ON LINE VERSION 2 07 MLW 1 SECTION 4 REMOTE I O CONNECTOR All of the features of the MLW 1 are available through the REMOTE I O connector as well as quite a few additional items To control the MLW 1 a relay or other dry closure TTL level device or open collector device is all that is needed The remote control inputs to the MLW 1 are TTL with internal pull up resistors Care should be taken not to exceed 5 VDC on these inputs Proper shielding is necessary and short runs
5. R will blink as will the Source 2 LED The WARN LED will light As soon as audio is restored to the missing channel on Source 2 it will be put back into the outputs This function is like the ONE TWO BOUNCE mode but is not user programmed LOSS OF CHANNEL GO TO SOURCE 3 WITH DELAY The MLW 1 will bring up the alternate channel into both outputs then wait for the programmed delay time to elapse The LEDs will indicate the channel that has audio L or R and the WARN LED will light After the delay and with no audio detected on the missing channel the MLW 1 will switch to Source 3 The metering stays on Source 2 As soon as audio is restored to the missing channel on Source 2 it will be put back into the outputs This function is like the ONE TWO BOUNCE mode but is not user programmed SILENCE NO SEQUENCE PROGRAMMING With silence and after the programmed time delay the WARN LED will light SILENCE GO TO SOURCE 3 Depending on the delay the MLW 1 will transfer the outputs to Source 3 The metering and detectors stay on Source 2 The WARN LED will light The L R LED and the Source 2 LED will blink The blinking serves two functions The first indicates that the ONE TWO BOUNCE mode is active as programmed internally and that Source 2 is missing As soon as the audio is restored the MLW 1 will bring up Source 2 See also SILENCE CASCADE OPERATING IN THE MANUAL MODE To put the MLW 1 into the Manual mode push the button labeled AUTO M
6. indicates the current status of the MLW 1 A LOW indicates that the MLW 1 is operating in the Automatic mode Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay PIN 17 Source 3 On This pin is an open collector output that indicates the current source on the MLW 1 A LOW indicates that the MLW 1 is operating with Source 3 on Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay PIN 18 Source 2 On This pin is an open collector output that indicates the current source on the MLW 1 A LOW indicates that the MLW 1 is operating with Source 2 on Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay PIN 19 Source 1 On This pin is an open collector output that indicates the current source on the MLW 1 A LOW indicates that the MLW 1 is operating with Source 1 on Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay PIN 20 Monitor Audio Out L R This output is used for monitoring the current source Source 1 or Source 2 operating on the MLW 1 The level on this pin is approximately 1 volt P P when the meter indicates 0 VU This output is unbalan
7. of wire are recommended The ALARM outputs from the MLW 1 are open collector and are capible of driving up to 500 ma at 50 volts MAXIMUM If the alarm outputs are to drive an inductive load relay a supression diode is required across the load to inhibit spikes from entering the MLW 1 The LED indicator group is a TTL level output and should not be loaded by more than 16 ma A remote control of current design can be directly driven as well as LEDs and logic circuitry For other loads insert a transistor capible of driving the required load The MLW 1 also has four audio outputs These are for the active source Source 1 or Source 2 and are unbalanced The output level is approximately 1 volt P P at 0 VU The outputs are for Left Channel Right Channel L R and L R These outputs are buffered and can drive most audio amplifiers directly The following pages in this section describe the REMOTE in detail REMOTE PINOUT PIN FUNCTION PIN FUNCTION 1 Analog Common 20 L R Audio Out 2 Analog Common 21 L R Audio Out 3 Analog Common 22 Right Channel Audio Out 4 Analog Common 23 Left Channel Audio Out 5 Analog Common 24 5 VDC Current Limited 6 Analog Common 25 5 VDC Current Limited 7 Digital Common 26 Input right channel on M 8 Input Auto Manual A M 27 Input left channel on M 9 Input Source 3 on A M 28 Input L R on M 10 Input Source 2 on A M 29 Input L R on M 11 Input Source 1 on A M 30 Input L R on M 12
8. outputs Connect to pin 7 to activate PIN 28 PUT L R ON This input will when the MLW 1 is in the Manual mode put the DIFFERENCE between the input channels of the current source Source 1 or Source 2 into both outputs Connect to pin 7 to activate PIN 29 PUT L ON This input will when the MLW 1 is in the Manual mode put the SUM of the input channels of the current source Source 1 or Source 2 into both outputs Connect to pin 7 to activate PIN 30 PUT L R ON This input will when the MLW 1 is in the Manual mode POLARITY INVERTE the input channels of the current source Source 1 or Source 2 into both outputs Connect to pin 7 to activate PIN 31 PUT L R ON This input will when the MLW 1 is in the Manual mode put the input channels of the current source Source 1 or Source 2 into both outputs Connect to pin 7 to activate PIN 32 LED output word R L R The six operating conditions of the MLW 1 as indicated the front panel are encoded into four outputs These outputs work in two groups The first group is indicated by a LOW on pin 15 and the second group is indicated by a HIGH on pin 15 The output level is TTL level and caution is advised with respect to interfacing the outputs in this group This pin indicates RIGHT is active with pin 15 low and L R active with pin 15 high PIN 33 LED output word L L R The six operating conditions of the MLW 1 as indicated on the front panel are encoded into four outpu
9. outputs when a channel is lost Switching this switch to the ON position enables the function of going to source 3 with the loss of a channel The result is that the MLW 1 will switch it s output audio from source 2 to source 3 There is a time delay associated with this function The time delay is set by SW 5 1 4 If the time delay is set for immediate response then the MLW 1 will not bring up the alternate channel but bring up source 3 immediately The metering and detector circuits stay on source 2 waiting for the return of the lost channel As soon as the channel returns then the MLW 1 will return it s outputs to source 2 SW 3 6 GO TO SOURCE 3 ON SILENCE SENSE ON SOURCE 2 The MLW 1 always alarms on silence after the time delay set by SW 5 5 8 If this switch is put in the ON position then the MLW 1 will switch it s output audio from source 2 to source after the time delay set by SW 5 5 8 The metering and detector circuits stay on source 2 waiting for the return of audio on source 2 As soon as the audio returns then the MLW 1 will return it s outputs to source 2 SW 3 7 ONE TWO LOOK AHEAD MODE This is one of the unique features of the MLW 1 With this switch in the ON position the MLW 1 when programmed to bring up source 2 source 1 active with channel loss or silence sense on source 1 will keep the MLW 1 on source 1 if source 2 has the identical problem This will keep the MLW 1 from switching to the alternate source if t
10. source 1 Switches 3 and 4 on SW 1 control the input level for the RIGHT input channel for source 1 Close or open the switches as indicated in the following table for the expected input operating level LEFT RIGHT SW 1 1 SW 1 2 SW 1 3 SW 1 4 8 DBM closed on closed on closed on Closed on 4 DBM closed on open off closed on open off 10 DBM open off open off open off open off 3 Repeat the above procedure for SW 2 for Source 2 and SW 6 for source 3 4 lf the user wants the output operating level to be at 4 DBM then remove the jumper at CF lower left corner of main circuit board from pins 1 2 and reinstall it between pins 3 4 The next step in the installation of the MLW 1 is the programming of the unit Please refer to the section titled PROGRAMMING THE MLW 1 contained elsewhere in this manual NOTE The MLW 1 was designed for an line input voltage range of 95 VAC to 130 VAC However operating the MLW 1 above 120 VAC causes it to generate some heat If your line voltage exceeds 120 VAC RMS be sure that the MLW 1 has adequate ventilation and is not sandwiched between other heat generating units The MLW 1 draws about 300 MA RMS at 120 VAC RMS or about 36 watts It can easily be run from an inexpensive UPS MLW 1 SECTION 3 PROGRAMMING THE MLW 1 The MLW 1 allows the user to determine what action is taken when a channel is lost or silence is detected with the current active source Only Sourc
11. 7 While feeding 8 0 DBM into the MLW 1 set R121 for a level of 0 775 VRMS at pin 5 of U107 ONO WP OUTPUT LEVEL TRIM The following steps will adjust the output operating level of the MLW 1 1 Follow the procedure as outlined in the section Basic Initial Set Up 2 Attach the DVM across the outputs for CHANNEL 1 3 Place the jumper located at CF lower left corner of the main board between pins 1 and 2 8 DBM output position 4 Set R182 for an output level on CHANNEL 1 of 8 0 DBM 1 946 VRMS 5 Attach the DVM and the 600 ohm resistor across the outputs for CHANNEL 2 6 Set R209 for an output level on CHANNEL 2 of 8 0 DBM OUTPUT DISTORTION TRIM The following steps will tune the MLW 1 for minimum distortion in the VCA group and the output amplifier stage 1 Follow the procedure as outlined in the section Basic Initial Set Up 2 Turn up the output of the audio oscillator to a level of between 20 DBM and 25 DBM 3 While monitoring the output of CHANNEL 1 with the distortion meter and with the output terminated in 600 ohms adjust R147 for minimum distortion If R147 does not cause a dip in the distortion level push the L R button then the L R button then the L R button This odd sequence will switch the routers and VCAs to the alternate group of VCAs Adjust R147 for minimum distortion 4 Now push the L R button then the L R button then the L R button and adjust R169 for minimum distortion 5 Adjust R1
12. 97 for minimum distortion R197 is the CHANNEL 1 output amplifier distortion adjustment 6 While monitoring the output of CHANNEL 2 with the distortion meter and with the output terminated in 600 ohms adjust R156 for minimum distortion If R156 does not cause a dip in the distortion level push the L R button then the L R button then the L R button This odd sequence will switch the routers and VCAs to the alternate group of VCAs Adjust R156 for minimum distortion 7 Now push the L R button then the L R button then the L R button and adjust R174 for minimum distortion 8 Adjust R231 for minimum distortion R231 is the CHANNEL 2 output amplifier distortion adjustment L R NOTCH AND GAIN SET The following procedure should be performed to maintain the precise notch for the L R and L R amplitude and phase detectors as well as the operating point for the routers and VCAs L R NOTCH AND GAIN SET The following procedure should be performed to maintain the precise notch for the L R and L R amplitude and phase detectors aw well as the operating point for the routers and VCAs 1 Follow the BASIC INITIAL SETUP procedure section above 2 Connect the HIGH of the oscillator to the of the LEFT Channel of the Source 1 input and the of the RIGHT channel of the Source 1 input Connect the LOW of the oscillator to the of the LEFT and the of the RIGHT channel input inputs are now fed out of phase Plug in the MLW 1 and depress the
13. AN When in the Manual mode the AUTO MAN light will not be illuminated To return to the Automatic mode simply push the AUTO MAN button again When illuminated the MLW 1 is in the Automatic mode In the Manual mode the MLW 1 provides the user with six modes of operation on either Source 1 or Source 2 The MLW 1 will reproduce the stereo input produce an out of phase stereo source produce the sum of the inputs on both output channels produce the difference between the two channels on both outputs direct the left or right channels inputs to both outputs Source 3 can also be accessed by the front panel but will only reproduce the source unmodified One unique feature of the MLW 1 is that it will remember the last condition for the last active source In other words if Left channel was selected for Source 1 and L R selected for Source 2 then simply pushing the Source 1 button will recall Left channel Source 1 and pushing the Source 2 button will recall L R for Source 2 This makes A B comparisons between two sources very easy Metering follows the active source except when Source 3 is called Then the metering stays on the last active of Source 1 or Source 2 Under some conditions there is a slight delay in switching the metering and audio typically under 500 MS Source 3 is accessed by pushing BOTH the Source 1 and the Source 2 buttons and releasing them The lights for Source 1 and Source 2 will both light No other condition will be light
14. AUTO MANUAL button to place the MLW 1 into the MANUAL mode Depress the L R button 3 Connect a 600 0 ohm resistor and the DVM across the audio analyzer inputs and connect the HIGH input to the CHANNEL 1 output and the LOW input to of the CHANNEL 1 output Adjust the audio oscillator for 8 0 DBM at 400 Hz 4 Adjust R142 for a reading of 8 0 DBM on the DVM or audio analyzer 5 Connect the HIGH of the oscillator to the of the LEFT channel of Source 1 inputs and the of the RIGHT channel Source 1 inputs Connect the LOW of the oscillator to the the of the LEFT and the of the RIGHT channel of Source 1 input inputs are now fed in phase Depress the L R button 7 Adjust R140 for a minimum reading on the analyzer less than 50 DBM 8 Connect the HIGH of the oscillator to the of the LEFT Channel of the Source 1 input and the of the RIGHT channel of the Source 1 input Connect the LOW of the oscillator to the of the LEFT and the of the RIGHT channel input inputs are now fed out of phase 9 Adjust R142 for 8 0 DBM on the analyzer or DVM 10 Repeat steps 2 through 9 until there is a minimal change in resistor settings DETECTOR ALIGNMENT The detectors in the MLW 1 are the analog to digital connection These detectors provide the microprocessor with information related to the signal on the inputs Adjust of these settings determine at which point there is channel loss the source is out of p
15. OF METERS The following outlines the procedure for adjusting the operating level of the metering on the MLW 1 Metering level adjustments do not need to be made when changes in operating level switches SW1 or SW2 are made ADJUSTMENT OF METERS The following outlines the procedure for adjusting the operating level of the metering on the MLW 1 Metering level adjustments do not need to be made when changes in operating level switches SW1 SW2 or SW6 are made 1 Follow the BASIC INITIAL SET UP procedure outlined above 2 Connect the HIGH of the oscillator to the of the LEFT channel of Source 1 inputs and the of the RIGHT channel Source 1 inputs Connect the LOW of the oscillator to the the of the LEFT and the of the RIGHT channel of Source 1 input inputs are now fed in phase 3 Set the oscillator level to 7 5 DBM 4 Set SW1 switches to the ON position 8 DBM operating level 5 Adjust the left hand pots on the upper and lower meter boards until the 1 VU LED lights 6 Now adjust the same pots until the 0 VU LED just lights 7 Adjust the right hand pot on the upper meter board until the 1 VU LED lights 8 Now adjust the same pot until the O VU LED just lights 9 Connect the HIGH of the oscillator to the of the LEFT Channel of the Source 1 input and the of the RIGHT channel of the Source 1 input Connect the LOW of the oscillator to the of the LEFT and the of the RIGHT channel input inputs a
16. TITUS TECHNOLOGICAL LABORATORIES MLW 1 OPERATIONS MANUAL TABLE OF CONTENTS TITLE SECTION INTRODUCTION INSTALLATION PROGRAMMING THE MLW 1 REMOTE I O CONNECTOR OPERATING THE MLW 1 ALIGNMENT OF THE MLW 1 WARRANTY SCHEMATICS NOOO BOND MLW 1 SECTION 1 INTRODUCTION The TITUS TECHNOLOGICAL LABORATORIES MLW 1 MULTICHANNEL AUDIO CONTROL was designed to overcome many of the problems associated with stereo broadcasting and production Automatic correction of the loss of an audio channel and polarity inversion out of phase audio as well as automatic insertion of a secondary or tertiary stereo audio source upon channel loss or silence as well as manual control of these and other conditions are just some of the features of the MLW 1 In the automatic mode the microprocessor based MLW 1 operates automatically to correct the loss of an audio channel by routing the channel with audio into both outputs It also corrects for polarity inversion on the inputs by supplying the outputs with a polarity correct signal This mode of operation is provided for two of the three stereo inputs One of the unique features of the MLW 1 is when operating in the automatic mode is the ability to put another source into the air chain upon loss of a channel after a user selected period of time The MLW 1 can put another stereo source into the air chain when silence is detected after a user selected period of time All sequencing and time delays are user selecte
17. ays alarm after the time delay with silence on the primary source regardless of the programming on SW 3 2 4 or 6 The levels at which Loss of Channel and Silence are detected are determined by the settings of R246 R257 R266 and R273 To change these operating parameters turn to the section in this manual titled ALIGNMENT OF THE MLW 1 NOTE Unless operating in the ONE TWO bounce mode operating with source 1 active and either SW 3 1 GO TO Source 2 on Loss of Channel or SW 3 2 GO TO Source 2 on Silence Sense switches ON source 2 will become the primary source when an error occurs The only way to put source 1 on again is to put the unit into the MANUAL MODE and push the Source 1 button Alternately if operating in the AUTOMATIC MODE then the MLW 1 can be put back into source 1 via the remote connector and a FORCED SOURCE 1 command issued See REMOTE for further details SPECIAL SILENCE MODES SILENCE CASCADE With SW 3 programmed for Source 1 to go to Source 2 with silence and Source 1 to go to Source 3 with silence and Source 2 programmed to go to Source 3 with silence SW 3 switches 2 4 and 6 ON the following sequence will happen ONE TWO LOOK AHEAD OFF ONE TWO BOUNCE OFF When silence occurs on Source 1 the MLW 1 will transfer to Source 2 after the programmed time delay If Source 2 is also silent then the MLW 1 will wait for the time delay again then bring up Source 3 When audio returns to Source 2 the
18. ced Use any of pins 1 through 6 or pin 24 for the common PIN 21 Monitor Audio Out L R This output is used for monitoring the current source Source 1 or Source 2 operating on the MLW 1 The level on this pin is approximately 1 volt P P when the meter indicates 0 VU This output is unbalanced Use any of pins 1 through 6 for the common PIN 22 Monitor Audio Out RIGHT This output is used for monitoring the current source Source 1 or Source 2 operating on the MLW 1 The level on this pin is approximately 1 volt P P when the meter indicates 0 VU This output is unbalanced Use any of pins 1 through 6 or pin 24 for the common PIN 23 Monitor Audio Out LEFT This output is used for monitoring the current source Source 1 or Source 2 operating on the MLW 1 The level on this pin is approximately 1 volt P P when the meter indicates 0 VU This output is unbalanced Use any of pins 1 through 6 or pin 24 for the common PIN 24 5 VDC Current limited 5 volt output source for external relays and leds PIN 25 5 VDC Current limited 5 volt output source for external relays and leds PIN 26 PUT RIGHT CHANNEL ON This input will when the MLW 1 is in the Manual mode put the Right channel of the current source Source 1 or Source 2 into both outputs Connect to pin 7 to activate PIN 27 PUT LEFT CHANNEL ON This input will when the MLW 1 is in the Manual mode put the Left channel of the current source Source 1 or Source 2 into both
19. circuits after the time delay set by SW 5 5 8 Source 2 becomes the primary source See ONE TWO bounce below for variations SW 3 3 GO TO SOURCE 3 ON LOSS OF CHANNEL ON SOURCE 1 Normally the MLW 1 will bring up the channel with audio into both outputs when a channel is lost Switching this switch to the ON position enables the function of going to source 3 with the loss of a channel The result is that the MLW 1 will switch it s output audio from source 1 to source 3 There is a time delay associated with this function The time delay is set by SW 5 1 4 If the time delay is set for immediate response then the MLW 1 will not bring up the alternate channel but bring up source 3 immediately The metering and detector circuits stay on source 1 waiting for the return of the lost channel As soon as the channel returns then the MLW 1 will return it s outputs to source 1 SW 3 4 GO TO SOURCE 3 ON SILENCE SENSE ON SOURCE 1 The MLW 1 always alarms on silence after the time delay set by SW 5 5 8 If this switch is put in the ON position then the MLW 1 will switch it s output audio from source 1 to source after the time delay set by SW 5 5 8 The metering and detector circuits stay on source 1 waiting for the return of audio on source 1 As soon as the audio returns then the MLW 1 will return it s outputs to source 1 SW 3 5 GO TO SOURCE 3 ON LOSS OF CHANNEL ON SOURCE 2 Normally the MLW 1 will bring up the channel with audio into both
20. ck for physical damage to the unit due to shipping If there is any problem with the unit please contact the factory immediately and notify the carrier of the damage The inputs for the MLW 1 are balanced bridging Twisted shielded pair wire should be used to connect to these inputs The outputs for the MLW 1 are X balanced Twisted shielded pair wire should also be used for connections to the outputs The wiring configurations for the inputs and outputs are shown on the MLW 1 Input and Output wiring diagram contained in this manual The diagram shows how to connect balanced or unbalanced inputs and outputs The input and output polarity is marked on the rear panel of the MLW 1 The is the audio high the is the audio low and the S is the shield of the audio wire S is not chassis ground but an audio common The MLW 1 is shipped with a 8 DBM input level and a 8 DBM output level The following procedure should be followed if the user desires to change the input or output levels 1 Remove the six 6 32 flat head screws on the sides of the top cover holding it in place Remove the five 4 40 screws on the top of the cover Remove the top cover 2 Locate the three 4 position dip switches SW 1 SW 2 and SW 6 SW 1 is the input operating level set for SOURCE 1 INPUT SW 2 is for level set for SOURCE 2 INPUT and SW 6 for SOURCE INPUT Switches 1 2 on SW 1 control the input level for the LEFT input channel for
21. d Another unique feature is a one two bounce mode If the MLW 1 is programmed for the one two bounce mode then when the primary source has a problem channel loss or silence a secondary or tertiary source is put into the audio chain until the problem is rectified At that point the original or primary source audio is again put into the audio chain In the manual mode the MLW 1 will provide the user manual control over the audio This provides the user with straight pass through audio polarity inverted out of phase stereo audio the sum of the selected input channels the difference between the selected input channels left input or right input only into both outputs All of these conditions are provided for two of the three stereo inputs on the illuminated push button on the front panel or via the remote connector on the rear panel The third stereo input is a fixed level input and can not be altered manually Full metering is provided on the front panel Bar graph LED metering is provided for the left and right channels on a 23 DB range VU meter Dot graph LED metering is provided for the L R and the L R channels on a 43 DB range VU meter By using the meters on the front panel it is possible to perform on the fly channel balance and polarity measurements of audio source material A buffered audio output for Left Right L R and L R channels is provided on the remote connector The metering and monitoring audio follows the active audio sou
22. e 1 and Source 2 are monitored Source 3 is a tertiary source and when brought on line will only reproduce what is on it s inputs SW 3 controls the sequencing Bounce mode and Look Ahead mode SW 5 controls the time delays for Channel Loss and Silence Sense while SW 4 controls the Polarity and Channel Loss checking as well as the Power Up mode The following table is a brief action table for programming the MLW 1 ACTIVE SOURCE SWITCH NUMBER ACTION SEQUENCE WHEN ON CLOSED Source 1 SW 3 1 Go to Source 2 on loss of channel SW 3 2 Go to Source 2 on silence SW 3 3 Go to Source 3 on loss of channel SW 3 4 Go to Source 3 on silence Source 2 SW 3 5 Go to Source 3 on loss of channel SW 3 6 Go to Source 3 on silence ONE TWO LOOK AHEAD MODE ON SW 3 7 On closed ONE TWO BOUNCE MODE ON SW 3 8 On closed SW 4 1 is not used CHECK FOR CHANNEL LOSS SW 4 2 On closed CHECK FOR POLARITY REVERSAL SW 4 3 On closed POWER UP IN AUTOMATIC SW 4 4 On closed TIME DELAY FOR LOSS OF CHANNEL ACTION alternate source only SW 5 positions 1 through 4 control the time delay 5 second increments based the binary position times 5 seconds The following table represents the approximate delay for specific switch positions SW 5 SWITCH POSITIONS 1 off on off on off on off on off on off on off on off on 2 off off on on off off on on off off on on off off on on 3
23. ed To return to either Source 1 or Source 2 just push their respective buttons The last condition for that source will again be active When operating in the Manual mode and Source 3 is active the MLW 1 will not allow returning to the Automatic mode The MLW 1 must have a preset source either Source 1 or Source 2 before it can change from Manual to Automatic mode The WARN LED will never light during the Manual mode The MLW 1 assumes that the operator is in control and no alarms are necessary MLW 1 SECTION 6 ALIGNMENT OF THE MLW 1 The MLW 1 was carefully adjusted at the factory for operation under normal conditions However replacement of parts or modification of operating parameters will require some degree of recalibration There is one basic alignment procedure However if you are only changing the operating level of the LOSS OF CHANNEL detectors then skip to the section on DETECTOR ALIGNMENT BASIC TEST EQUIPMENT REQUIRED 4 1 2 digit DVM FLUKE 8060A Audio oscillator with less than 0 03 THD Sound Technology 1710A Oscilloscope Dual trace 100 mHz Distortion analyzer Sound Technology 1710A Precision 600 0 ohm resistor networks BASIC INITIAL SETUP Remove the eleven cover screws and take the top cover of the unit off Refer to the layout print for the MLW 1 for all of the following adjustments In the following adjustments 8 0 DBM is equivalent to 1 946 Volts RMS across 600 0 ohms at 400 Hz 1 Connect the 600 0 ohm res
24. hase or the source is silent 1 Follow the BASIC INITIAL SET UP procedure outlined above 2 Connect the HIGH of the oscillator to the of the LEFT channel of Source 1 inputs and the of the RIGHT channel Source 1 inputs Connect the LOW of the oscillator to the the of the LEFT and the of the RIGHT channel of Source 1 input inputs are now fed in phase 3 Set the oscillator level to 20 DBM 4 Attach the negative input lead of the DVM to the negative lead of C209 in the power supply 5 Attach the positive input lead of the DVM to the cathode side of D131 lower middle of audio board 6 Adjust R246 to the point at which the voltage measured at D131 drops to less than 1 volt this point will switch between about 5 VDC and about 0 volts 7 Attach the positive input lead of the DVM to the cathode side of D132 lower middle of audio board 8 Adjust R257 to the point at which the voltage measured at D132 drops to less than 1 volt this point will switch between about 5 VDC and about 0 volts 9 R246 and R257 adjust the LOSS OF CHANNEL threshold If the MLW 1 is operating ata 8 DBM input then adjusting the oscillator for a 20 DBM level and setting the trip points at 20 DBM will tell the MLW 1 that there is loss of a channel when that channel drops to below 28 DBM from operating level 8 to 20 equals 28 DB This relationship holds true regardless of changes in the input operating level settings SW1 SW2
25. he MLW 1 will transfer to Source 2 after the programmed time delay If Source 2 is also silent then the MLW 1 will wait for the time delay again then bring up Source 3 When audio returns to Source 2 the MLW 1 will check for audio on Source 1 IfSource 1 also has audio then the MLW 1 will transfer back to Source 1 from Source 3 ONE TWO LOOK AHEAD ON ONE TWO BOUNCE OFF When silence occurs on Source 1 the MLW 1 will wait for the time delay then look at Source 2 for audio If there is no audio on Source 2 then the MLW 1 will transfer to Source 3 and wait for audio to return to Source 1 As soon as audio returns to Source 1 then the MLW 1 will transfer back to Source 1 Source 2 will not be activated If Source 2 has audio when Source 1 was initially silent then the MLW 1 will transfer to Source 2 ONE TWO LOOK AHEAD OFF OR ON ONE TWO BOUNCE ON When silence occurs on Source 1 the MLW 1 will put Source 2 on regardless if there is audio present on Source 2 or not The MLW 1 will then wait for audio to return on Source 1 When audio reappears on Source 1 the MLW 1 will transfer back to Source 1 SOURCE 2 ACTIVE LOSS OF CHANNEL NO PROGRAMMING The MLW 1 will automatically bring up the alternate channel into both outputs The LEDs will indicate the channel that has audio L or R and the WARN LED will light LOSS OF CHANNEL GO TO SOURCE 3 NO DELAY The MLW 1 will immediately bring up Source 3 into the outputs The missing channel LED L or
26. he problem with source 1 is for example at the studio and not on the STL that the MLW 1 is protecting This feature is handy for STLs With this switch in the OFF position then the MLW 1 will switch to source 2 regardless of the condition of source 2 This condition would be desirable if the MLW 1 is being used as a studio or remote broadcast switcher SW 3 8 ONE TWO BOUNCE MODE This is another one of the unique features of the MLW 1 With this switch in the ON position the MLW 1 when programmed to bring up source 2 source 1 active when channel loss or silence sense occurs will keep the detector circuits on source 1 while putting the audio from source 2 into it s outputs When the error condition that caused source 2 to be put into the outputs is corrected then the MLW 1 will automatically return the outputs to source 1 In effect the audio will bounce from source 1 to source 2 if so programmed on error while the detectors stay on source 1 If a time delay is selected for the function then the ONE TWO bounce will wait for that delay before performing this function This function will work in tandom with the ONE TWO LOOK AHEAD feature above If the ONE TWO LOOK AHEAD is enabled the ONE TWO BOUNCE will not transfer sources if source 2 has the same problem as source 1 SW 5 5 8 TIME DELAY SET FOR SILENCE SENSE ACTION See table for settings The WARN alarm on the front panel and the remote SILENCE SENSE alarm will alw
27. ill light steady for L R and Source 2 The LEDs will blink for the missing channel on Source 1 L or R and the Source 1 LED will blink The blinking serves two functions The first indicates that the ONE TWO BOUNCE mode is active as programmed internally and that Source 1 is missing a channel and which channel is missing As soon as the channel is restored the MLW 1 will bring up Source 1 LOSS OF CHANNEL GO TO SOURCE NO DELAY The MLW 1 will immediately bring up Source 3 into the outputs The missing channel LED L or R will blink as will the Source 1 LED The WARN LED will light As soon as audio is restored to the missing channel on Source 1 it will be put back into the outputs This function is like the ONE TWO BOUNCE mode but is not user programmed LOSS OF CHANNEL GO TO SOURCE 3 WITH DELAY The MLW 1 will bring up the alternate channel into both outputs then wait for the programmed delay time to elapse The LEDs will indicate the channel that has audio L or R and the WARN LED will light After the delay and with no audio detected on the missing channel the MLW 1 will switch to Source 3 The metering stays on Source 1 As soon as audio is restored to the missing channel on Source 1 it will be put back into the outputs This function is like the ONE TWO BOUNCE mode but is not user programmed SILENCE NO SEQUENCE PROGRAMMING With silence and after the programmed time delay the WARN LED will light SILENCE GO SOURCE 2 Wi
28. istor to the audio oscillator output Connect the HIGH of the oscillator to the terminal of the LEFT and RIGHT channel inputs of Source 1 Connect the LOW of the oscillator to the terminal of the LEFT and RIGHT channel inputs of Source 1 The inputs are now fed in phase Plug in the MLW 1 and depress the AUTO MANUAL button to place the MLW 1 into the MANUAL mode Depress the L R button first button on left 2 Connect a 600 0 ohm resistor across the audio analyzer inputs and connect the HIGH input to the LEFT channel output and the LOW input to of the LEFT channel output Adjust the audio oscillator for exactly 8 0 DBM at 400 Hz 3 Set all of the switches on SW1 and SW2 to the ON position 8 DBM input level INPUT LEVEL TRIM The input level trim adjust is set for the 8 DBM input operating level position There are no adjustments for the other input levels 1 After the basic initial setup attach one lead of the DVM to the negative lead of C209 power supply common Attach the other lead of the DVM to pin 6 of U107 While feeding 8 0 DBM into the MLW 1 set R105 for a level of 0 775 VRMS at pin 6 of U107 Remove the DVM lead from pin 6 U107 and connect it to pin 24 of U107 U107 is a 28 pin device While feeding 8 0 DBM into the MLW 1 set R113 for a level of 0 775 VRMS at pin 24 of U107 Attach the audio oscillator to the inputs for Source 2 Remove the DVM lead from U107 pin 24 and attach it to pin 5 of U10
29. itionally SW 4 2 3 4 are closed on for checking Channel Loss Polarity and powering up in Automatic With normal audio on the source inputs there is a natural delay of about 1 second before the MLW 1 will recgonize loss of channel even in the immediate mode Polarity takes about two seconds to recgonize polarity inversion or recovery from polarity error The following is a list of the specific actions of each of the programming functions by switch position number SW 3 1 GO TO SOURCE 2 ON LOSS OF CHANNEL ON SOURCE 1 Normally the MLW 1 will bring up the channel with audio into both outputs when a channel is lost Switching this switch to the ON position enables the function of going to source 2 with the loss of a channel The result is that the MLW 1 will switch it s output audio from source 1 to source 2 as well as the metering and detector circuits Source 2 becomes the primary source There is a time delay associated with this function The time delay is set by SW 5 1 4 If the time delay is set for immediate response then the MLW 1 will not bring up the alternate channel but bring up source 2 immediately See ONE TWO bounce below for variations SW 3 2 GO TO SOURCE 2 ON SILENCE SENSE ON SOURCE 1 The MLW 1 always alarms on silence after the time delay set by SW 5 5 8 If this switch is put in the ON position then the MLW 1 will switch it s output audio from source 1 to source 2 as well as the metering and detector
30. quick summary of the MLW 1 features follows Independent level set on each channel of Source 1 Source 2 and Source 3 inputs Programmable output levels Microprocessor controlled routing signal sensing VCA control POWER LOSS AUDIO BYPASS relay puts Source 1 into the outputs if power is lost Full metering of active source Full monitoring audio outputs for active source AUTOMATIC or MANUAL operation Programmable power up mode selection for automatic or manual 7 Automatic Channel Loss correction and Polarity correction user programmable defeat 8 Automatic alternate source on Channel Loss or Silence User programmed SEQUENCE and TIME DELAYS 9 Exclusive ONE TWO BOUNCE will put alternate source on line while maintaining watch on primary source When problem with primary source is cleared it is put back on line User programmable 10 Exclusive ONE TWO LOOK AHEAD will not allow secondary source to be put on line if it has the same problem as the primary source User programmable 11 Alarms for Channel Loss Polarity inversion Silence ONE TWO BOUNCE 12 TOTALLY remote controllable Open collector outputs TTL control inputs 13 Substantial head room 27 dom 29 maximum output level 14 FORCED operating conditions User can force Source 1 Source 2 or Source 3 on line during automatic operation via remote connector DAWN MLW 1 SECTION 2 INSTALLATION After unpacking the MLW 1 che
31. rce one or two All audio inputs and outputs are through barrier type connections on the rear panel A DC 37 type connector on the rear panel is used for alarm outputs remote control inputs and monitor audio Audio input channel levels can be dip switch set for nominal operating levels of 8 DBM 4 DBM and 10 DBM All of the inputs are balanced bridging and D C isolated The nominal output operating level can be set for either 4 DBM or 8 DBM The outputs are X balanced D C isolated and can provide for a maximum output level of 29 DBV or greater than 27 DBM into 600 ohms Full remote control of the MLW 1 is provided on a DC 37 connector on the rear panel Alarms are provided for channel loss silence sense polarity inversion and one two bounce mode active Outputs are also provided for indicating the current active source as well as the operating mode of the MLW 1 Control inputs allow operation of the MLW 1 remote control or automation system The MLW 1 is completely microprocessor controlled All audio switching is accomplished with a 32 by 4 microprocessor controlled audio router The selected audio output is cross faded into the audio chain by microprocessor controlled VCAs Front panel switching remote control as well as alarms and status are microprocessor controlled All user programmed thresholds sequencing and delays are digitally derived Because of this the MLW 1 is extremely precise and flexible A
32. re now fed out of phase 10 Set the oscillator to a level of 7 5 DBM 11 Adjust the right hand pot on the lower meter board until the 1 VU LED lights 12 Now adjust the same pot until the 0 VU LED just lights This completes the audio alignment of the MLW 1 Please contact the factory if there are any problems with the above procedure or if there are questions about operating at unique levels or configurations NOTES When performing the distortion measurements connecting the oscilloscope to the distortion analyzer outputs can help during the set up of the MLW 1 for minimum distortion Silence sense should be set to a minimum of 6 DB above the Loss of Channel threshold for proper operation of the Loss of Channel condition
33. th silence and after the programmed time delay the MLW 1 will transfer the outputs to Source 2 Metering and the detectors are also transferred Since this is a total change over of audio metering and control there is no WARN LED SILENCE GO TO SOURCE 2 ONE TWO BOUNCE Depending on the delay the MLW 1 will transfer the outputs to Source 2 The metering and detectors stay on Source 1 The LED will light steady for Source 2 The WARN LED will light The L R LED and the Source 1 LED will blink The blinking serves two functions The first indicates that the ONE TWO BOUNCE mode is active as programmed internally and that Source 1 is missing As soon as the audio is restored the MLW 1 will bring up Source 1 SILENCE GO TO SOURCE 3 Depending on the delay the MLW 1 will transfer the outputs to Source 3 The metering and detectors stay on Source 1 The WARN LED will light The L R LED and the Source 1 LED will blink The blinking serves two functions The first indicates that the ONE TWO BOUNCE mode is active as programmed internally and that Source 1 is missing As soon as the audio is restored the MLW 1 will bring up Source 1 SILENCE CASCADE With SW 3 programmed for Source 1 to go to Source 2 with silence and Source 1 to go to Source 3 with silence and Source 2 programmed to go to Source 3 with silence SW 3 switches 2 4 and 6 ON the following sequence will happen ONE TWO LOOK AHEAD OFF ONE TWO BOUNCE OFF When silence occurs on Source 1 t
34. tput that indicates that the MLW 1 has discovered that the source is silent after the preprogrammed period of time delay A LOW indicates that the MLW 1 has detected silence Use pin 7 for the common The maximum load is 500 ma at 50 volts suppression diode is recommended across the load if it is inductive such as a relay PIN 37 CHANNEL LOSS ALARM This pin is an open collector output that indicates that the MLW 1 has discovered that there is a missing channel on the current source Source 1 or Source 2 A LOW indicates that the MLW 1 has detected a lost channel and has put the channel with audio into both of it s outputs Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay MLW 1 SECTON 5 OPERATING THE MLW 1 After properly installing and setting up the MLW 1 operation is quite simple The push buttons will illuminate to indicate what is happening to the audio and what the MLW 1 is doing AUTOMATIC MODE When the MLW 1 is first powered up it will either start in the Automatic or Manual mode depending on how the user has pre programmed it In the Automatic mode the button labeled is illuminated pushing any of the other buttons will have no effect and are locked out What the user has programmed the MLW 1 to do with channel or signal loss is now in effect The MLW 1 initializes with Source 1 as the active input and
35. ts These outputs work in two groups The first group is indicated by a LOW on pin 15 and the second group is indicated by a HIGH on pin 15 The output level is TTL level and caution is advised with respect to interfacing the outputs in this group This pin indicates LEFT is active with pin 15 low and L R active with pin 15 high PIN 34 BOUNCE MODE ACTIVE This pin is an open collector output that indicates that the BOUNCE mode is active on the MLW 1 The BOUNCE mode is indicated when the MLW 1 is programmed for the ONE TWO BOUNCE and a condition exists to put the MLW 1 into that mode or when the MLW 1 is programmed to go to Source 3 with error condition and a condition exists to put the current source at Source 3 This indicator is only active during operation in the Automatic mode A LOW indicates that the MLW 1 is operating with the BOUNCE mode on Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay PIN 35 POLARITY ALARM This pin is an open collector output that indicates that the MLW 1 has discovered that the source is out of phase and has corrected the problem A LOW indicates that the MLW 1 is operating with the L R mode on Use pin 7 for the common The maximum load is 500 ma at 50 volts A suppression diode is recommended across the load if it is inductive such as a relay PIN 36 SILENCE SENSE ALARM This pin is an open collector ou
36. urce 2 in the Automatic mode This may be usefull if it is necessary to put a stereo synthesizer or test signal on the air quickly Connect to pin 7 to activate PIN 10 Source 2 On This input is used to put Source 2 on remotely when in the Automatic or Manual mode Connect to pin 7 to activate PIN 11 Source 1 On This input is used to put Source 1 on remotely when the Automatic or Manual mode Connect to pin 7 to activate PIN 12 Reserved This pin is used for custom user remote conditions PIN 13 STEREO FREEZE This input will FREEZE the MLW 1 in the L R or stereo mode during operation in the Automatic mode During operation in this mode the MLW 1 will not check polarity silence sense or channel loss The MLW 1 will freeze after the next transision if it is operating in any condition other than L R Connect to pin 7 to activate PIN 14 LED output word L R L R The six operating conditions of the MLW 1 as indicated on the front panel are encoded into four outputs These outputs work in two groups The first group is indicated by a LOW on pin 15 and the second group is indicated by a HIGH on pin 15 This output is TTL level and caution is advised with respect to interfacing these output in this group This pin indicates L R is active with pin 15 low and L R active with pin 15 high PIN 15 LED Group Indicator See pin 14 above for description of this pin PIN 16 AUTO MANUAL Output This pin is an open collector output that
37. will reproduce the source pass through as indicated by the L R LED being lit There are four overrides to the Automatic mode They are Source 1 ON Source 2 On Source 3 ON and Stereo Freeze These three are available on the Remote I O connector on the rear of the MLW 1 and are described in the section of this manual titled Remote Connector As mentioned earlier the push buttons illuminate to indicate what the MLW 1 is doing The following describes the cause and effect of various automatic functions SOURCE 1 ACTIVE LOSS OF CHANNEL NO PROGRAMMING The MLW 1 will automatically bring up the alternate channel into both outputs The LEDs will indicate the channel that has audio L or R and the WARN LED will light LOSS OF CHANNEL GO TO SOURCE 2 NO DELAY The MLW 1 will immediately bring up Source 2 into the outputs The L R LED will light The WARN LED will not light All monitoring is transferred to Source 2 LOSS OF CHANNEL GO TO SOURCE 2 WITH DELAY The MLW 1 will bring up the alternate channel into both outputs then wait for the programmed delay time to elapse The LEDs will indicate the channel that has audio L or R and the WARN LED will light After the delay and with no audio detected on the missing channel the MLW 1 will switch to Source 2 LOSS OF CHANNEL GO TO SOURCE 2 ONE TWO BOUNCE Depending on the delay the MLW 1 will transfer the outputs to Source 2 The metering and detectors stay on Source 1 The LEDs w

MLW-1 Manual post 1995 - 45kb - PDF

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