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7700 MultiFrame Manual 

7700ADA7-EQ Equalizing Analog Video Distribution Amplifier

 

Revision 1.2

 

REVISION HISTORY 

 

 

REVISION DESCRIPTION DATE

 

 
1.0 

Original Version 

Jul 05 

 
1.1 

Updated block diagram 

Oct 07 

 
1.2 

General format clean up 

Sept 09 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Information contained in this manual is believed to be accurate and reliable. However, Evertz assumes no responsibility for the use thereof nor for 
the rights of third parties, which may be affected in any way by the use thereof.  Any representations in this document concerning performance of 
Evertz products are for informational use only and are 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 assumed in relation to any errors or omissions unless specifically undertaken in the Evertz sales contract or order confirmation.  
Information contained in this manual is periodically updated and changes will be incorporated into subsequent editions.  If you encounter an error, 
please notify Evertz Customer Service department. Evertz reserves the right, without notice or liability, to make changes in equipment design or 
specifications. 

 

Summary of Contents for 7700ADA7-EQ MultiFrame

Page 1: ... 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 7700ADA7 EQ Block Diagram 1 Figure 2 1 7700ADA7 EQ Rea...

Page 2: ...ure 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 assumed in relation to any e...

Page 3: ...hich has a 15 slot capacity the portable 3RU 350FR frame which has a 7 slot capacity or a standalone enclosure which holds a single module Features 75 Ohm or high impedance input jumper selectable High common mode range and common mode rejection ratio CMMR Gain control Jumper selectable AC or DC coupling Jumper selectable fast or slow back porch clamp DC level control when clamp is enabled Cable e...

Page 4: ...e section 3 of the 7700FR chapter Figure 2 1 7700ADA7 EQ Rear Panel IN Input isolated BNC connector for analog video signals The TERM jumper located on the module near the back determines whether the input signal will be high impedance or terminated with 75 ohms See section 6 2 The INPUT jumper located on the module near the back determines whether the input signal will be AC or DC coupled See sec...

Page 5: ...nnector 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 1694A cable Impedance 75Ohms terminated 35kOhms Hi Z jumper selectable Coupling AC or DC jumper selectable Return Loss 40dB to 10MHz 30dB to 30MHz Clamp Range 600mV Fast Clamp Attenuation of 60Hz 36dB 3 2 ANALOG VIDEO OUTPUTS Number of Outputs 7 Con...

Page 6: ...7700 MultiFrame Manual 7700ADA7 EQ Equalizing Analog Video Distribution Amplifier Page 4 Revision 1 2 3 3 ELECTRICAL Voltage 12VDC Power 5 Watts 3 4 PHYSICAL Number of Slots 1 ...

Page 7: ...lications with computer monitors Other manufacturer s 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 is turned ...

Page 8: ...o 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 POT An ad...

Page 9: ...status indicators on the power supply s FRAME STATUS LED s and 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 a T con...

Page 10: ... 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 level to ...

Page 11: ...ply 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 Adjus...

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