Broadcast Any DVR or Camera to Every.
Turn your home's existing wall coax cables into a crystal-clear whole-house channel for your CCTV security cameras, satellite box, or.
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Every port, shield, and switch on the SignalLink Pro is designed to eliminate RF bleed and media-closet clutter.
Tap CH- or CH+ on the bright 2-digit LED display to claim any vacant channel across 47–868 MHz (UHF Ch 21–69 & VHF) with zero dip-switch math.
Screw your rooftop antenna into RF In and your house splitter into RF Out to add your private camera or DVR channel alongside free local TV.
Toggle Tvlink ON and attach the included dual-head 38kHz adhesive IR emitters to pause, rewind, or switch DVR views from bedrooms.
Internal isolation delivers an adjustable 75–85 dBuV signal and >55 dB SNR—stopping snowy herringbone bars and adjacent-channel bleed cold.
Plug your security DVR, satellite box, or VCR into the color-coded Yellow/White/Red RCA jacks, then thread your antenna and house splitter cables onto the silver RF In and RF Out ports.
Power the unit from any open USB port on your DVR using the included cable, then tap CH- or CH+ until the front 2-digit red LED locks onto a clean, unoccupied channel like 65.
Grab your regular remote in the bedroom, kitchen, or workshop, punch in Channel 65, and watch your live security cameras or media feed with zero apps, Wi-Fi lag, or monthly fees.
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Agile Multi-Channel UHF/VHF Coax Injector with Inline OTA Pass-Through & IR Repeater Kit
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Why Cheap Ch 3/4 Boxes Ruin Your Picture: Standard $19 retail modulators force your video onto VHF Channels 3 or 4—the dirtiest, most interference-prone frequencies in North America. SignalLink Pro unlocks clean UHF Channels 21–69 with >55 dB SNR shielding so every TV gets crisp color and clear stereo audio.
Designed for Structured Wiring Closets & Racks: Measuring a compact 106 × 68 × 28 mm with dual 4.2mm slotted side mounting flanges, the matte-black chassis screws flat onto plywood backboards, media cabinets, or DVR shelves so heavy RG6 coax tension never pulls your connections loose.
30-Day Money-Back Guarantee & 2-Year Warranty: Hook the Cosari SignalLink Pro inline with your house coax splitter for 30 full days. If every TV on your line doesn't tune into your custom channel with rock-steady clarity and zero interference to your antenna channels, return it for a full refund.
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Integrated 4.2mm side ears let you screw the enclosure flat behind racks or inside structured wiring panels in seconds.
Draws just 400mA (<2W) via the included USB cord plugged right into your DVR's open USB jack—eliminating hot wall-wart bricks.
Automatically restores your configured channel number the instant power returns after storms or breaker resets.
Cosari SignalLink ProStandard Competitors
| Feature | Cosari SignalLink Pro | Standard Competitors |
|---|---|---|
| Selectable Channels | Full UHF Ch 21–69 & VHF (47–868 MHz) | Locked to noisy VHF Ch 3 / Ch 4 |
| Inline OTA Antenna Pass-Through | Clean RF In / RF Out (>55 dB SNR) | Snowy static & adjacent bleed |
| Channel Configuration | 2-Digit LED Display + CH-/CH+ Buttons | Tiny unlabeled micro dip-switches |
| Remote Closet Control | 9V Tvlink Switch + Dual IR Emitter Included | None (or $45+ add-on kit) |
| Typical Price | $69.99 (50% Off Today) | $159–$245 Commercial Headend Gear |
Swipe left for steps 2 and 3
Plug your DVR or AV source into the Yellow/White/Red RCA jacks, and screw your antenna and house coax cables onto RF In and RF Out.
Connect the white micro-USB cable to 5V power and tap CH+ on the front face to select an empty UHF channel like 65 on the red LED display.
Scan once on your household TVs, punch in Channel 65 on any remote, and enjoy crystal-clear live cameras or video across every room.
Best TV Link Modulator I've used for composite video. The CH- and CH+ buttons above the display make channel adjustments simple, and the shielded box does a great job keeping interference out when converting RCA composite to coax.
I put this inline with my existing OTA antenna using the threaded RF in and RF out ports. Picking an open channel on the front digital display was straightforward, and the added channel comes through nicely on our TVs.
Works perfectly for my security setup. I ran the DVR's yellow CVBS composite RCA output into this, combined it with the antenna feed, and now every TV in the house can show the cameras just by changing channels.
The analog RF picture is clean and crisp. I chose an unused terrestrial channel number on the digital display, connected my security cameras, and it was ready. Now I can pull up the camera view without any complicated setup.
The price was right and it does exactly what I needed. I can toggle the Tvlink on/off switch and choose the desired channel right on the front 2-digit LED display. Setup took only a few minutes.
Nothing fancy about the matte-black TV LINK MODULATOR housing, but the dedicated yellow, white, and red RCA inputs work very well. Composite-to-RF conversion is clean, stable, and more solid than the unbranded boxes I've tried before.
Finally an affordable option for multi-channel UHF/VHF AV-to-RF distribution. The picture has noticeably sharper color than my older fixed-channel 3/4 modulators, and being able to select different channels from the front is a big improvement.
I'm quite satisfied and would buy another if I need one. The included white micro-USB power cable was handy, the two IR emitter heads came with adhesive pads, and the side mounting flanges made installation neat.
The included black dual-head IR emitter cable plugs into the labeled 3.5mm jack beside the RCA ports. I can control my source box remotely over the coax setup, and the picture stays stable without the interference I had before.
I used the two slotted side flanges to screw the matte-black box behind my media rack. Power comes from the DVR's USB jack through the 5V micro-USB port, so my whole CCTV distribution setup stays tidy.
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Yes. Simply screw your incoming rooftop antenna coaxial cable into 'RF in' and connect the cable going to your house coax splitter into 'RF out'. All your free local broadcast stations pass straight through while the SignalLink Pro injects your new DVR or AV channel onto an empty UHF slot.
You are never stuck on Channel 3 or 4. Using the front CH- and CH+ push buttons and live 2-digit LED Channel Display, you can select clean, unoccupied channels across UHF Channels 21–69 as well as VHF bands (47–868 MHz).
No. Built-in non-volatile memory permanently saves your selected channel number and settings. As soon as power returns, it boots right back onto your exact channel automatically.
It accepts standard composite RCA inputs: Yellow (CVBS video) plus White (Left) and Red (Right) stereo audio jacks. It converts these into crisp standard-definition RF coax video with stereo sound (it does not take direct 4K HDMI or output 5.1 surround).
When paired with a coax TV-Link remote eye at a secondary TV, flipping 'Tvlink' to ON supplies 9V DC over coax to receive your remote presses. Plug the included dual-head IR emitter cable into the 3.5mm jack and stick the two adhesive emitter heads over your DVR and satellite box sensors to control them from another room.
Yes, a white USB-A to Micro-USB power cable is included in the box. Because it draws less than 2W (5V DC / 400mA), you can plug it directly into any open USB port on the back of your CCTV DVR, satellite box, or TV—or into any standard 5V USB phone wall adapter.