Antronix CMC2003H-A 3-Way Horizontal Coax Splitter
- 3-way split, one input to three outputs
- 5 to 1002 MHz frequency range
- 3.5 dB and 7 dB loss ratings
- 1 inch port-to-port spacing, SCTE compliant
- 120 dB RFI shielding from a fully soldered back
- 6 kV ring wave surge protection on every port
- Capacitively coupled F-ports block AC surges
- 15 psi sealed F-ports resist water migration
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A coax splitter for feeding several tuners or modems from one line, built to survive weather and surges. Its loss figures are modest but real, so long runs may still need an amplifier.
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ASIN: B07T3H3XGHModel: CMC2003H-ACategory: Video Converters
Overview
Not a signal booster, the Antronix CMC2003H-A is a passive three-way coax splitter that divides one cable feed among three devices. Capacitively coupled F-ports pass the signal while blocking AC surges, and the diecast housing with plated backplate shrugs off corrosion. Mounting tabs let it sit vertically or with all ports facing down inside an enclosure.
Where this splitter earns its place is at the point where one drop has to serve a cable modem, a set-top box and a TV without letting the modem's transmit power bleed into the other ports. Port-to-port return band isolation and low intermodulation distortion keep those signals from distorting each other, and the sealed ports hold up outdoors. The limitation is that it splits passively, so every leg loses signal and a weak feed will show it.
Who it's for
Homes and small offices where one cable feed must reach a modem plus two more devices, and where the splitter may live in a box outdoors. Buyers who need to lift a weak signal should look at an amplifier instead, since this unit only divides what arrives.
Pros and cons
- Divides one feed among three devices
- Sealed ports resist water migration
- Surge protection on every port
- Diecast housing fights corrosion
- Insertion loss on every leg
- No amplification of weak signals
- Impedance listed as 4 ohm
- No included cables or hardware
Performance notes
What governs the result is the loss each leg takes and how strong the incoming feed is. Low intermodulation distortion and return band isolation keep a modem's upstream signal from disturbing the other ports, while the capacitively coupled ports stop AC surges from reaching the devices. Sealed, spaced ports maintain a stable ground and keep moisture out over time.
Specifications
| Brand | Antronix |
|---|---|
| Model | CMC2003H-A |
| Construction & materials | |
| Color | Black |
| Warranty & support | |
| Warranty Description | 1 year |
| Other details | |
| Number Of Items | 1 |
| Number Of Channels | 3 |
| Mfr Part Number | CMC2003H-A |
| Antennadescription | Television |
| Impedance | 4 ohms |
Frequently asked questions
What comes in the box with the Antronix CMC2003H-A?
The splitter itself, with integrated mounting tabs and a heavy duty ground block built in. No coax cables, connectors or mounting screws are listed as included.
Can this splitter be mounted outdoors or in an enclosure?
Yes. The housing has integrated mounting tabs for a universal mount design, so it can sit vertically or with all ports facing down, which suits NID enclosures. The sealed F-ports and UV resistant label are made for that kind of exposure.
Does the Antronix CMC2003H-A amplify the signal?
No. It is a passive splitter, so each of the three outputs receives less signal than the input. The documented loss ratings are 3.5 dB and 7 dB depending on the leg.
Will this splitter work with a cable modem and a TV on the same line?
The design targets two-way broadband networks, and port-to-port return band isolation keeps high power modem signals from distorting signals on the neighboring ports. Any device that takes a standard coax F-connector can connect.