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Introduction 

 

1  Introduction 

Welcome to Kramer Electronics (since 1981): a world of unique, creative and 

affordable solutions to the infinite range of problems that confront the video, 

audio and presentation professional on a daily basis. In recent years, we have 

redesigned and upgraded most of our line, making the best even better! Our 

500-plus different models now appear in 8 Groups

1

, which are clearly defined 

by function.  
Congratulations on purchasing your Kramer 

Cobra R500A

 Video-Audio 

receiver

 and/or 

Cobra R500-2

 Video-RS-232 receiver

. The Kramer 

Cobra 

Series System extends VGA and audio signals over ordinary Category 5 

cable. This manual covers the 

Cobra R500A

 Video-Audio receiver

 with 

audio, and the 

Cobra R500-2

 Video-RS-232 receiver

 

with RS-232 serial 

support. For information on the respective transmitter unit, refer to the 

appropriate manual included with the transmitter. 
The package includes the 

Cobra R500A

 Video-Audio receiver

 or the 

Cobra 

R500-2

 Video-RS-232 receiver

, an external power supply, and this user 

manual

2

The Kramer 

Cobra

 series products are not compatible with Kramer non-

Cobra

 

series products. 

2  Getting Started 

We recommend that you: 

 

Unpack the equipment carefully and save the original box and packaging 

materials for possible future shipment 

 

Review the contents of this user manual 

 

Use Kramer high performance high resolution cables

3

. You may 

also need CAT 5 cable. We recommend that you use our Kramer Pico 

Skew CAT 5e cable

4

 

                                                       

 

1 GROUP 1: Distribution Amplifiers; GROUP 2: Video and Audio Switchers, Matrix Switchers and Controllers; GROUP 3: 
Video,  Audio,  VGA/XGA  Processors;  GROUP  4:  Interfaces  and  Sync  Processors;  GROUP  5:  Twisted  Pair  Interfaces; 
GROUP 6: Accessories and Rack Adapters; GROUP 7: Scan Converters and Scalers; and GROUP 8: Cables and Connectors 
2 Download up-to-date Kramer user manuals from the Internet at this URL: http://www.kramerelectronics.com 
3 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com 
4 In addition, you may also need 1/8” (3.5mm) audio cable with RCA jacks, 1/8” (3.5mm) serial cable with DB9 connector, 
and Video cable with HD15 connectors 

Summary of Contents for Cobra R500-2

Page 1: ...Kramer Electronics Ltd USER MANUAL Models Cobra R500A Video Audio receiver Cobra R500 2 Video RS 232 receiver...

Page 2: ...hnical Specifications 10 Figures Figure 1 Transmitter Connections 4 Figure 2 Cobra R500A Video Audio receiver Connections 4 Figure 3 Transmitter Connections 5 Figure 4 Cobra R500 2 Video RS 232 receiv...

Page 3: ...2 Video RS 232 receiver an external power supply and this user manual2 The Kramer Cobra series products are not compatible with Kramer non Cobra series products 2 Getting Started We recommend that you...

Page 4: ...due to the manufacture method can exhibit much greater skew than standard CAT 5 5e and may require skew compensation beyond what the standard product offers Contact Kramer Electronics for assistance...

Page 5: ...nections via the 1 8 3 5mm audio connector or DB9 serial connector transmitter model dependent 4 Connect the CAT 5 cable to the transmitter 5 Apply power on the transmitter The LED should light and if...

Page 6: ...t video and audio signals over CAT 5 cable The audio signal is line level audio and powered speakers are required Figure 1 shows the Kramer Cobra transmitter with Audio Transmitter connections and Fig...

Page 7: ...ND serial Figure 3 shows the Kramer Cobra transmitter with serial Transmitter connections and Figure 4 shows the Cobra R500 2 Video RS 232 receiver See Appendix A for cable pinouts of the Cobra R500 2...

Page 8: ...parts inside the Cobra R500A Cobra R500 2 All adjustments are performed externally Table 1 Cobra R500A Cobra R500 2 Configuration Settings SW Configuration Settings SW position 1 2 3 Signal Setting L...

Page 9: ...wer is ON Check input source levels from the source device Make sure the audio source is not overdriven or underdriven Audio is summed left and right for A versions If using a single channel both audi...

Page 10: ...Table 3 HD15 Video Connector PINOUT Pin RGBHV VGA RGBS RGsB Composite SVHS Y C YUV 1 Red Red Red C V 2 Green Green Green C Y Y 3 Blue Blue Blue U 4 5 Gnd Gnd Gnd 6 Red Red Red C V 7 Green Green Green...

Page 11: ...5 mm Audio Serial Connection model dependent Pin Signal Tip Serial Tx DB9 pin3 Left Audio Ring Serial Rx DB9 pin2 Right Audio Sleeve Serial GND DB9 pin5 GND Note The stereo audio input at the transmit...

Page 12: ...hms maximum REQUIRED DESTINATION IMPEDANCE Video IN 75 ohms Audio IN if any 600 ohms minimum AUDIO CHARACTERISTICS Channels Right Left summed Line Level 600 Ohm Unbalanced SERIAL CHARACTERISTICS Proto...

Page 13: ...11...

Page 14: ...or the latest information on our products and a list of Kramer distributors visit our Web site www kramerelectronics com where updates to this user manual may be found We welcome your questions commen...

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