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Frame Manual

500ADA-EQ-L Equalizing Analog Video Distribution Amplifier

Revision

1.2

500ADA-EQ-L - 9

6.5.

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 500ADA output signal has flat frequency response.

6.6.

LOW PASS FILTER SELECTION

The jumper J9 allows the user to select whether the signal bypasses the low pass filter or not. The low
pass filter has a corner frequency of 8MHz with the end of the passband at 8MHz.

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Содержание exponent 500ADA-EQ-L

Страница 1: ...TUS 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 AC DC COUPLING 7 6 3 DC RESTORING CLAMP OPERATION 8 6 4 GAIN ADJUSTMENT 8 6 5 CABLE EQUALIZATION OPERATION 9 6 6 LOW PASS FILTER SELECTION 9 Figures Figure 1 1 500ADA EQ L Block Diagram 1 Figure 2 1 500ADA EQ L Rear Panel Over...

Страница 2: ...500ADA EQ L Equalizing Analog Video Distribution Amplifier Revision 1 2 REVISION HISTORY REVISION DESCRIPTION DATE 1 0 Original Version Jul 06 1 1 Updated jumper diagram Nov 06 1 2 Fixed formatting and typos Jul 07 ...

Страница 3: ...d in the 500FR L A Frame that will hold up to 16 modules Features Passive loop through built into frame High common mode range and common mode rejection ratio CMRR Gain control 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 1694 Consistent input impedance if card power ...

Страница 4: ...unction For information on inserting the module into the frame see section 3 of the 500FR chapter Figure 2 1 500ADA EQ L Rear Panel Overlay IN Input isolated BNC looping connectors for analog video signals The INPUT jumper located on the module near the back determines whether the input signal will be AC or DC coupled See section 6 2 OUT 1 to 8 There are eight BNC connectors with equalized filtere...

Страница 5: ...onnector 1 BNC input per IEC 169 8 Common mode range 6Vp p CMRR 70dB to 1kHz Signal amplitude 2 5Vp p max Cable equalizer 0 to 300m of Belden 8281 or 1694 cable Impedance 35 kOhms Hi Z Coupling AC or DC jumper selectable Sigle Card Return loss1 25dB to 5 5MHz Clamp range 600mV Fast clamp attenuation of 60Hz 36dB 3 2 ANALOG VIDEO OUTPUTS Number of Outputs 8 Per Card Connector BNC per IEC 169 8 Outp...

Страница 6: ...L gain inequality 0 1 for all cable lengths C L Delay LPF OUT 2nsec LPF IN 3nsec Output isolation 42dB to 10MHz 32 dB to 30MHz Output return loss 40dB to 30MHz Noise performance 78dB RMS NTC7 weighting 70dB RMS 15kHz to 5 5MHz 3 3 ELECTRICAL Voltage 12VDC Power 1 2 Watts 3 4 PHYSICAL Number of slots 1 ...

Страница 7: ...ications 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 is turned on...

Страница 8: ...e constant of the clamping action may be fast or slow and the DC level may be set with a card edge POT An adjustable gain stage feeds the cable equalizer that can adjust the frequency response to match the attenuation of up to 300m of coaxial cable One OP Amp drives the eight output BNC s with 75 Ohm output impedance The digital power supply is separated from the analog power supply In the case of...

Страница 9: ... to the 500FR L A frame s global status bus FRAME STATUS To monitor faults on this module with the frame 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 AC DC COUPLING The input may be AC ...

Страница 10: ... 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 val...

Страница 11: ...el 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...

Страница 12: ...Frame Manual 500ADA EQ L Equalizing Analog Video Distribution Amplifier 500ADA EQ L 10 Revision 1 2 This page left intentionally blank ...

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