What Is the CO-EX330-K?
The OREI CO-EX330-K is an HDMI extender over a single coaxial cable with IR control. It sends HDMI video and audio up to 328ft / 100m using one 75-ohm RG-6U coaxial cable.
The kit includes a Transmitter and Receiver. The HDMI source connects to HDMI IN on the Transmitter, the display connects to HDMI OUT on the Receiver, and the coaxial cable connects from COAX OUT on the Transmitter to COAX IN on the Receiver.
The CO-EX330-K supports HDMI 1.3 and HDCP 1.1. It supports video resolutions up to 1080p@60Hz, Deep Color up to 12-bit color depth, PCM 48kHz audio, bi-directional IR control, EDID switching, and cascade / loop-out connection from Receiver to additional Receivers. Full HD transmission is supported up to 100m / 328ft over RG-6U coaxial cable.
The CO-EX330-K is useful for retrofit AV installations, CCTV-style coax wiring upgrades, home theaters, classrooms, conference rooms, digital signage, retail displays, and installations where an HDMI source needs to be extended using existing coaxial cable.
IMPORTANT — CO-EX330-K Extends HDMI Over Coaxial Cable
The CO-EX330-K uses one 75-ohm RG-6U coaxial cable for HDMI signal extension.
| Connection | Function |
| Transmitter HDMI IN | Connect HDMI source |
| Transmitter COAX OUT | Send signal over coaxial cable |
| Receiver COAX IN | Receive coaxial signal |
| Receiver HDMI OUT | Connect HDMI display |
| Receiver LOOP OUT | Cascade to another Receiver |
This product does not use CAT cable or fiber optic cable for the main extension path.
IMPORTANT — Supports 1080p, Not 4K
The CO-EX330-K supports HDMI video up to 1080p@60Hz.
Supported resolutions include:
| Supported Resolution |
| 480i |
| 576i |
| 720p@50 / 59.94 / 60Hz |
| 1080i@50 / 59.94 / 60Hz |
| 1080p@23.98 / 24 / 25 / 29.97 / 30 / 50 / 59.94 / 60Hz |
It does not support:
- 4K
- 4K@60Hz
- 4K@120Hz
- 8K
For 4K over coaxial cable, use a 4K HDMI over coaxial extender model.
IMPORTANT — Maximum Distance Depends on Resolution
The CO-EX330-K supports different distances depending on video resolution.
| Signal Type | Maximum Distance |
| Full HD | Up to 100m / 328ft over RG-6U |
| HD | Up to 200m over RG-6U |
| SD | Up to 300m over RG-6U |
For best performance at 1080p, keep the coaxial cable run within 100m / 328ft.
IMPORTANT — Use RG-6U 75-Ohm Coaxial Cable
The manual specifies 75-ohm RG-6U coaxial cable.
| Cable Requirement | Specification |
| Cable type | RG-6U coaxial cable |
| Impedance | 75 ohm |
| Full HD distance | Up to 100m / 328ft |
Poor coaxial cable, weak connectors, splitters, adapters, damaged cable, or bad terminations may cause no video, unstable signal, or reduced distance.
Factory-terminated cable assemblies are strongly recommended, and the manual notes that each cable length should not exceed 328ft.
IMPORTANT — Cascade / Loop-Out Function Is Supported
The CO-EX330-K supports cascade function.
The Receiver includes LOOP OUT.
| Port | Function |
| Receiver COAX IN | Receives coaxial signal from Transmitter |
| Receiver LOOP OUT | Sends coaxial signal to the next Receiver |
This allows installers to build a coaxial distribution chain using additional compatible Receiver units.
The application diagram shows one Transmitter feeding multiple Receivers through coaxial cable, with each Receiver connected to a TV.
IMPORTANT — Bi-Directional IR Is Supported
The CO-EX330-K supports bi-directional IR control.
This means IR control can work in both directions:
| Direction | Use Case |
| Receiver side to Transmitter side | Control the HDMI source from the display location |
| Transmitter side to Receiver side | Control the display from the source location |
Typical source-control setup:
- Connect the IR Receiver to IR RX on the Receiver.
- Place the IR Receiver near the display.
- Connect the IR Blaster to IR TX on the Transmitter.
- Place the IR Blaster in front of the HDMI source device’s IR eye.
Typical display-control setup:
- Connect the IR Receiver to IR RX on the Transmitter.
- Place the IR Receiver where the display remote can point.
- Connect the IR Blaster to IR TX on the Receiver.
- Place the IR Blaster in front of the display’s IR eye.
IMPORTANT — Wideband IR 20kHz–60kHz Is Supported
The CO-EX330-K supports wideband IR from 20kHz to 60kHz.
| IR Feature | Support |
| IR frequency | 20kHz–60kHz |
| Source control from display side | Supported |
| Display control from source side | Supported |
| IR Receiver cable | Included |
| IR Blaster cable | Included |
Do not swap the IR Receiver and IR Blaster cables. They have different functions and different pin definitions.
IMPORTANT — EDID Switching Is Included
The Transmitter includes an EDID switch.
| EDID Position | EDID Setting |
| 00 | 1080p, 2CH PCM 48kHz |
| 01 | 1080p, 5.1CH PCM 48kHz |
| 10 | 1080p, 7.1CH PCM 48kHz |
| 11 | 1080i, 2CH PCM 48kHz |
Use EDID switching when there is no video, no audio, wrong resolution, or HDMI handshake issues.
IMPORTANT — HDMI Cable Length Should Not Exceed 16ft
The manual recommends using high-speed HDMI cables and notes that HDMI cable length should not exceed 16ft.
| HDMI Connection | Recommendation |
| Source to Transmitter | High-speed HDMI cable, up to 16ft |
| Receiver to Display | High-speed HDMI cable, up to 16ft |
Poor HDMI cables may cause no picture, flickering, black screen, no audio, or HDCP handshake issues.
IMPORTANT — Both Units Need Power
The CO-EX330-K includes two DC 5V power supplies.
| Unit | Power Requirement |
| Transmitter | DC 5V / 1A |
| Receiver | DC 5V / 1A |
Both the Transmitter and Receiver must be powered.
Power consumption is listed as:
| Unit | Power Consumption |
| Transmitter | 2.3W |
| Receiver | 2.2W |
Ports and Panel Layout
| Port / Indicator / Switch | Unit | Function |
| LINK LED | Transmitter | Illuminates when connected with HDMI source |
| HDMI IN | Transmitter | Connect HDMI source device |
| IR RX | Transmitter | Connect IR Receiver cable |
| IR TX | Transmitter | Connect IR Blaster cable |
| EDID Switch | Transmitter | Selects EDID preset |
| Power LED | Transmitter | Red LED turns on when powered |
| DC 5V | Transmitter | Connect DC 5V power supply |
| COAX OUT | Transmitter | Connect RG-6U coaxial cable to Receiver COAX IN |
| LOCK LED | Receiver | Illuminates when HDMI signal from Transmitter is stable |
| HDMI OUT | Receiver | Connect HDMI display |
| IR RX | Receiver | Connect IR Receiver cable |
| IR TX | Receiver | Connect IR Blaster cable |
| Power LED | Receiver | Red LED turns on when powered |
| DC 5V | Receiver | Connect DC 5V power supply |
| COAX IN | Receiver | Connect coaxial cable from Transmitter |
| LOOP OUT | Receiver | Connect coaxial cable to next compatible Receiver |
Step-by-Step Setup
- Connect the HDMI source device to HDMI IN on the Transmitter.
Examples include a Blu-ray player, DVD player, cable box, satellite receiver, DVR, NVR, media player, or computer. - Connect one 75-ohm RG-6U coaxial cable from COAX OUT on the Transmitter to COAX IN on the Receiver.
- Connect HDMI OUT on the Receiver to the HDMI input on the display.
- Connect the DC 5V power supply to the Transmitter.
- Connect the DC 5V power supply to the Receiver.
- Set the EDID switch based on the required resolution and audio format.
- If using IR source control, connect IR Receiver to Receiver IR RX and IR Blaster to Transmitter IR TX.
- If using IR display control, connect IR Receiver to Transmitter IR RX and IR Blaster to Receiver IR TX.
- Power on the HDMI source, display, Transmitter, and Receiver.
- Check the Power LED, LINK LED, and LOCK LED.
- Test video, audio, and IR control.
- If cascading to another Receiver, connect Receiver LOOP OUT to the next Receiver’s COAX IN using another 75-ohm RG-6U coaxial cable.
Coaxial Cable Requirement — Critical
Use one 75-ohm RG-6U coaxial cable between the Transmitter and Receiver.
| Requirement | Specification |
| Cable type | RG-6U coaxial |
| Impedance | 75 ohm |
| Full HD distance | Up to 100m / 328ft |
| HD distance | Up to 200m |
| SD distance | Up to 300m |
Poor coaxial cable may cause:
- No video
- Flickering
- Black screen
- LOCK LED not lighting
- Signal instability
- IR control issues
- Reduced distance
- Cascade failure
Use direct, properly terminated coaxial cable whenever possible.
HDMI Cable Requirement — Critical
Use high-speed HDMI cables.
| HDMI Cable Use | Maximum Recommended Length |
| Source to Transmitter | Up to 16ft |
| Receiver to Display | Up to 16ft |
For troubleshooting, test the HDMI source directly with the display before using the extender.
Power Requirement — Critical
Both units require DC 5V / 1A power.
| Unit | Power |
| Transmitter | DC 5V / 1A |
| Receiver | DC 5V / 1A |
If the red Power LED does not turn on, check the power adapter, outlet, and DC connection.
Understanding the Transmitter
The Transmitter is installed near the HDMI source.
It has:
- HDMI IN
- COAX OUT
- IR RX
- IR TX
- EDID switch
- LINK LED
- Power LED
- DC 5V input
The Transmitter captures the HDMI input and IR signals, then sends them over a single coaxial cable to the Receiver.
Understanding the Receiver
The Receiver is installed near the HDMI display.
It has:
- COAX IN
- HDMI OUT
- LOOP OUT
- IR RX
- IR TX
- LOCK LED
- Power LED
- DC 5V input
The Receiver equalizes and reconstructs the HDMI and IR signals, then outputs HDMI to the display.
Understanding Cascade Connection
Cascade connection allows the signal to continue from one Receiver to another compatible Receiver.
Basic cascade setup:
| Step | Connection |
| 1 | Transmitter COAX OUT to Receiver 1 COAX IN |
| 2 | Receiver 1 HDMI OUT to Display 1 |
| 3 | Receiver 1 LOOP OUT to Receiver 2 COAX IN |
| 4 | Receiver 2 HDMI OUT to Display 2 |
The application diagram shows multiple Receivers connected in a chain, each sending HDMI to a separate TV.
Understanding EDID
EDID helps the HDMI source choose the correct video and audio format.
Use EDID when:
- There is no video
- Audio does not work
- Display shows unsupported signal
- HDMI handshake is unstable
- The source outputs the wrong resolution
For most 1080p displays, start with 00 for 1080p with 2CH PCM audio.
Understanding Bi-Directional IR
Bi-directional IR lets remote control signals travel through the extender system.
Use the IR Receiver where the remote control will be pointed.
Use the IR Blaster near the device being controlled.
Examples:
| Goal | IR Receiver Location | IR Blaster Location |
| Control source from TV side | Receiver IR RX | Transmitter IR TX |
| Control TV from source side | Transmitter IR RX | Receiver IR TX |
Understanding LED Indicators
| Indicator | Status | Meaning |
| Transmitter LINK LED On | HDMI source is connected | |
| Receiver LOCK LED On | HDMI signal from Transmitter is stable | |
| Power LED On | Device is connected to power |
Use these indicators first when troubleshooting.
Supported Video and Audio
The CO-EX330-K supports video formats including:
| Supported Video |
| 480i |
| 576i |
| 720p@50 / 59.94 / 60Hz |
| 1080i@50 / 59.94 / 60Hz |
| 1080p@23.98 / 24 / 25 / 29.97 / 30 / 50 / 59.94 / 60Hz |
| Deep Color up to 12-bit color depth |
Supported audio:
| Audio Support |
| PCM 48kHz audio |
| Lip-Sync pass-through |
Supported Technical Specifications
| Specification | Support |
| Product Type | HDMI extender over single coaxial cable |
| HDMI Version | HDMI 1.3 |
| HDCP Version | HDCP 1.1 |
| Frequency Bandwidth | 225MHz / link |
| Maximum Resolution | 1080p@60Hz |
| Color Depth | Up to 12-bit Deep Color |
| Audio | PCM 48kHz |
| Lip-Sync | Pass-through supported |
| IR | Bi-directional wideband IR |
| IR Frequency | 20kHz–60kHz |
| Coaxial Cable | 75-ohm RG-6U |
| Full HD Distance | Up to 100m / 328ft |
| HD Distance | Up to 200m |
| SD Distance | Up to 300m |
| Cascade Function | Supported through Receiver LOOP OUT |
| Transmitter Input | HDMI IN |
| Transmitter Output | COAX OUT |
| Receiver Input | COAX IN |
| Receiver Output | HDMI OUT, LOOP OUT |
| Power Supply | 2 x DC 5V / 1A |
| Power Consumption | TX 2.3W; RX 2.2W |
| Dimensions | 100mm x 105mm x 25mm |
| Weight | 280g |
| Operating Temperature | 32°F to 104°F |
| Storage Temperature | -4°F to 140°F |
| Relative Humidity | 20–90% RH, non-condensing |
| ESD Protection | ±8kV air-gap, ±4kV contact |
What Source Devices Is the CO-EX330-K Compatible With?
The CO-EX330-K is compatible with HDMI source devices such as:
- DVD players
- Blu-ray players
- Cable boxes
- Satellite receivers
- Streaming devices
- Media players
- DVRs
- NVRs
- Computers with HDMI output
- HDMI switch outputs
- HDMI matrix outputs
The source must output a supported HDMI resolution up to 1080p@60Hz.
What Displays Is the CO-EX330-K Compatible With?
The CO-EX330-K can connect to HDMI displays such as:
- 1080p TVs
- HD TVs
- Monitors
- Projectors
- HD-LCD displays
- HD-DLP displays
- Digital signage displays
- Security monitoring displays
- Classroom displays
- Conference room displays
The display must support the selected HDMI resolution.
Frequently Asked Questions
Q: What is the OREI CO-EX330-K used for?
A: The CO-EX330-K is used to extend HDMI video, audio, and IR control over a single 75-ohm RG-6U coaxial cable.
Q: Does the CO-EX330-K support 4K?
A: No. It supports up to 1080p@60Hz.
Q: Does it support 1080p?
A: Yes. It supports 1080p@60Hz.
Q: What HDMI version does it support?
A: It supports HDMI 1.3.
Q: What HDCP version does it support?
A: It supports HDCP 1.1.
Q: What video bandwidth does it support?
A: It supports 225MHz / link.
Q: What coaxial cable should I use?
A: Use 75-ohm RG-6U coaxial cable.
Q: How far can it extend Full HD?
A: It can extend Full HD up to 100m / 328ft over RG-6U coaxial cable.
Q: How far can it extend HD?
A: HD signal can extend up to 200m over RG-6U coaxial cable.
Q: How far can it extend SD?
A: SD signal can extend up to 300m over RG-6U coaxial cable.
Q: Can I use CAT cable with this product?
A: No. This product uses coaxial cable, not CAT cable.
Q: Can I use fiber cable with this product?
A: No. This product is an HDMI over coaxial extender.
Q: Does it support cascade connection?
A: Yes. The Receiver has LOOP OUT for cascading to another compatible Receiver.
Q: How does cascade connection work?
A: Connect Transmitter COAX OUT to Receiver 1 COAX IN, then connect Receiver 1 LOOP OUT to the next Receiver COAX IN.
Q: Does it support IR control?
A: Yes. It supports bi-directional IR control.
Q: What IR frequency is supported?
A: It supports wideband IR from 20kHz to 60kHz.
Q: Which IR cable goes where for source control?
A: Connect the IR Receiver to Receiver IR RX and the IR Blaster to Transmitter IR TX.
Q: Which IR cable goes where for display control?
A: Connect the IR Receiver to Transmitter IR RX and the IR Blaster to Receiver IR TX.
Q: Does it support EDID management?
A: Yes. The Transmitter has an EDID switch.
Q: What EDID settings are available?
A: EDID settings include 1080p 2CH PCM, 1080p 5.1CH PCM, 1080p 7.1CH PCM, and 1080i 2CH PCM.
Q: What audio format is supported?
A: It supports PCM 48kHz audio.
Q: Does it support Dolby Digital or DTS?
A: The manual lists PCM 48kHz audio only.
Q: Does it support Dolby TrueHD or DTS-HD?
A: No. These formats are not listed for this model.
Q: Does it support Lip-Sync?
A: Yes. Lip-Sync pass-through is supported.
Q: Does it support Deep Color?
A: Yes. It supports Deep Color up to 12 bits per color.
Q: Do both units need power?
A: Yes. Both Transmitter and Receiver require DC 5V / 1A power.
Q: How many power supplies are included?
A: Two DC 5V power supplies are included.
Q: What does the Transmitter LINK LED mean?
A: It lights when the Transmitter is connected with an HDMI source.
Q: What does the Receiver LOCK LED mean?
A: It lights when the HDMI signal from the Transmitter is stable.
Q: What should I do if there is no video?
A: Check both power supplies, HDMI source, HDMI cables, RG-6U coaxial cable, EDID setting, display input, and the LINK / LOCK LEDs.
Q: What should I do if the Transmitter LINK LED is off?
A: Check the HDMI source, HDMI cable, and HDMI IN connection.
Q: What should I do if the Receiver LOCK LED is off?
A: Check the coaxial cable, Receiver power, Transmitter power, and COAX OUT to COAX IN connection.
Q: What should I do if video is unstable?
A: Use factory-terminated RG-6U cable, keep the Full HD run within 328ft, remove splitters or adapters, and test with a shorter coaxial cable.
Q: What should I do if audio does not work?
A: Set the HDMI source audio output to PCM and try an EDID setting with 2CH PCM.
Q: What should I do if IR control does not work?
A: Confirm the IR Receiver and IR Blaster are connected in the correct direction and placed in line of sight.
Q: Does the CO-EX330-K need external power?
A: Yes. Connect the included DC 5V / 1A power supplies to both the Transmitter and Receiver.
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