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7700 MultiFrame Manual  

7700ADA6-EQ-L Equalizing Analog Video Distribution Amplifier with Loop Thru 

 Revision 

1.2 

Page - 9 

6.6. 

CABLE EQUALIZATION OPERATION 

With the cable equalizer 

EQCTRL

 POT set fully counter-clockwise, the cable equalizer will be set to the 

"zero length". As you turn the POT clockwise, more cable equalization is added. To set the POT to the 
correct position, perform the following calibration: 
 
1.  Supply the cable being equalized with a multiburst or horizontal sweep test signal. 
2.  Make sure the driving level from the test generator is calibrated to unity. 
3.  Set the cable type termination jumper (J6) to the type of cable you are using (either 8281 or 1694). If 

you are using a different type, then use either setting. 

4.  Make sure the card input termination and the test gear is terminated properly. 
5.  Adjust the DC level if the clamp is enabled and calibrate the GAIN level POT for unity output at low 

frequencies. 

6.  Adjust the "EQCTRL" POT until the 7700ADA7 output signal has flat frequency response. 
 
 

Summary of Contents for 7700ADA6-EQ-L

Page 1: ...SICAL 4 4 STATUS LEDS 5 5 CIRCUIT DESCRIPTION 6 6 JUMPERS AND USER ADJUSTMENTS 7 6 1 SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED BY THE GLOBAL FRAME STATUS 7 6 2 SELECTING THE INPUT TERMINATION 7 6 3 SELECTING THE INPUT AC DC COUPLING 7 6 4 DC RESTORING CLAMP OPERATION 8 6 5 GAIN ADJUSTMENT 8 6 6 CABLE EQUALIZATION OPERATION 9 Figures Figure 1 1 7700ADA6 EQ L Block Diagram 1 Figure 2 1 7700AD...

Page 2: ... not warranties of future performance either expressed or implied The only warranty offered by Evertz in relation to this product is the Evertz standard limited warranty stated in the sales contract or order confirmation form Although every attempt has been made to accurately describe the features installation and operation of this product in this manual no warranty is granted nor liability assume...

Page 3: ...ill hold up to 15 modules or the 1RU frame which will hold up to three modules Features Passive loop thru Gain Control High common mode range and common mode rejection ratio CMMR Jumper selectable AC or DC coupling Jumper selectable fast or slow back porch clamp DC level control when clamp is enabled Cable equalizer adjustment range 0 to 300m of 8281 or 1694AA Consistent input impedance if card po...

Page 4: ...n be placed over the rear panel BNC connectors to identify their function For information on inserting the module into the frame see section 3 of the 7700FR chapter Figure 2 1 7700ADA7 EQ Rear Panel IN Input isolated BNC connector for analog video signals LOOP OUT Passive loop thru of input signal OUT 1 to 6 There are six BNC connectors with equalized level and DC adjusted copies of the input sign...

Page 5: ...qualizer set to 0 length 3 1 ANALOG VIDEO INPUT Standards Any analog video format up to 2Vp p and 30MHz bandwidth Connector BNC per IEC 61169 8 Annex A Common Mode Range 6Vp p CMRR 70dB to 1kHz Signal Amplitude 2 5Vp p max Cable Equalizer 0 to 300m of Belden 8281 or 1694AA cable Coupling AC or DC jumper selectable Return Loss 40dB to 10MHz 30dB to 30MHz Clamp Range 600mV Fast Clamp Attenuation of ...

Page 6: ...0ADA6 EQ L Equalizing Analog Video Distribution Amplifier with Loop Thru Page 4 Revision 1 2 3 3 ELECTRICAL Voltage 12VDC Power 1 2 Watts EMI RFI Complies with FCC Part 15 Class A EU EMC Directive 3 4 PHYSICAL Number of Slots 1 ...

Page 7: ...Cs for applications with computer monitors Other manufacturers DACs may not have the same sync size so the detection may not work with these signals Sync High Low Indicators The sync level of the processed video is measured to determine if its amplitude is approximately correct If sync is below 270mV then the amber SYNC LOW LED is turned on and if sync is above 320mV then the amber SYNC HIGH LED i...

Page 8: ... For video applications the synchronization pulses are analyzed for position and size information A clamp pulse is generated from the sync information and a clamp signal is delivered to a DC restorer circuit that positions the blanking level to ground This feature can be enabled with a jumper The time constant of the clamping action may be fast or slow and the DC level may be set with a card edge ...

Page 9: ...d on the Frame s Fault Tally output install this jumper in the On position When this jumper is installed in the Off position local faults on this module will not be monitored 6 2 SELECTING THE INPUT TERMINATION The input termination may be set via card jumper J5 to either 75 Ohms default or Hi Z 34k Ohms Set it to Hi Z when using the passive loop thru BNC connector to loop the signal through sever...

Page 10: ...position If the video has a sizeable amount of noise i e a low quality off air signal the fast clamp will generate a line to line level distortion also called piano keying because of the noise In this situation use the SLOW clamp position of J8 The CLAMP LEVEL POT on the card front edge allows you to adjust the DC level that the back porch is being clamped to This allows you to set the output DC l...

Page 11: ...ion 1 Supply the cable being equalized with a multiburst or horizontal sweep test signal 2 Make sure the driving level from the test generator is calibrated to unity 3 Set the cable type termination jumper J6 to the type of cable you are using either 8281 or 1694 If you are using a different type then use either setting 4 Make sure the card input termination and the test gear is terminated properl...

Page 12: ...7700 MultiFrame Manual 7700ADA6 EQ L Equalizing Analog Video Distribution Amplifier with Loop Thru Page 10 Revision 1 2 This page left intentionally blank ...

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