10 Best 8 Channel HDMI to Coax Modulators (November 2026)

The most common mistake in this category is buying the wrong kind of modulator. A small NTSC box that outputs on channel 3 or 4 feeds one old CRT television and nothing else. A digital QAM or ATSC encoder puts HDMI video on a proper channel that modern TVs and cable-style distribution can tune. Buy the first when you need the second and the signal never appears. Buy the second for a single retro console and you pay for features you cannot use. The Best 8 Channel HDMI to Coax Modulators depend on how many sources you need to send, which TVs must receive them, and whether those TVs tune analog channels or digital ones.

The short answer: the kurtmark HDMI to RF Modulator Kit suits anyone connecting one HDMI device to an older antenna-input TV with everything in the box, the Thor Broadcast H-HDMI-RF-PETIT suits a single source delivered as a digital QAM or ATSC channel, and the VQP HDM61 VHF Modulator suits retro gaming on a CRT with a fixed CH3/CH4 output. The rest of the list covers dual-input analog boxes, a single-channel digital encoder, and three Thor Broadcast units built for true multi-source distribution, including two with eight inputs.

TL;DR: top picks at a glance

• Best overall: the kurtmark HDMI to RF Modulator Kit, a complete plug-and-play kit with a 1.2 m HDMI cable, RG6 coax and power supply, outputting NTSC on CH3/CH4.
• Best for digital QAM/ATSC from one source: Thor Broadcast H-HDMI-RF-PETIT, a 9.6 oz unit that encodes up to 1080p with AC3 audio and is controlled from a PC.
• Best for retro CRT gaming: VQP HDM61 VHF Modulator, with fixed CH3 (61.25 MHz) and CH4 (67.25 MHz) output and 1080p to 480p input handling.
• Best for eight independent channels: Thor Broadcast 8-Channel HDMI and SDI, with 8 HDMI/SDI inputs mapped to 8 separate RF channels.

Best 8 Channel HDMI to Coax Modulators Comparison (November 2026)

#	Product	Best for	Output	Inputs	Weight
1	kurtmark HDMI to RF Modulator Kit	Complete CRT kit	NTSC CH3/CH4	HDMI	Not listed
2	Thor Broadcast H-HDMI-RF-PETIT	Single digital channel	QAM/ATSC/DVB-T/ISDB-T	HDMI	9.6 oz
3	VQP HDM61 VHF Modulator	Retro gaming	NTSC CH3/CH4	HDMI	Not listed
4	ADRFClub HDMI/RCA UHF Modulator	Mixed HDMI and RCA	NTSC/PAL, VHF/UHF	HDMI or RCA	Not listed
5	SatLink ST-7000	Digital single feed	ATSC or QAM (J.83B)	HDMI	3.2 lb
6	RQG VHF UHF Modulator	Multi-TV analog	VHF/UHF, PAL/NTSC	HDMI or RCA	13.4 oz
7	upxuntek CH3/CH4 Modulator	Antenna pass-through	NTSC CH3/CH4	HDMI	1.78 oz
8	Thor Broadcast 8-HDMI QAM Modulator	Eight HDMI sources	QAM/ATSC/ISDB-T	8 HDMI	9.4 lb
9	Thor Broadcast 8-Channel HDMI and SDI	Eight-channel headend	QAM/ATSC/DVB-T/ISDB-T	8 HDMI or SDI	9 lb
10	Thor Broadcast Rack-Mount QAM Modulator	Rack-based distribution	QAM/ATSC/DVB-T/ISDB-T	HDMI	10 lb

1. kurtmark HDMI to RF Modulator Kit: Best Plug-and-Play NTSC Kit HDMI to Coax Modulator for CRT TVs

• Output: NTSC on CH3 and CH4, RF level 80 ± 5 dBµV
• Input resolutions: 1080P, 1080i, 720P, 576P and 480P
• Standards: HDMI 1.4 and HDCP 1.4
• In the box: 1.2 m HDMI cable, RG6 coax cable, power adapter and power cable
• Power and build: 5V DC, ABS housing

Pros:

• The box includes an HDMI cable, an RG6 coax lead and a power supply, so nothing extra is needed to connect a streaming stick to an old TV.
• Built-in PLL frequency control keeps the RF carrier stable, which reduces drift between sessions.
• Input handling covers 1080P down to 480P, so consoles and media players negotiate a mode without manual setup.
• The standard NTSC audio system (M, 4.5 MHz) matches North American analog TVs.

Cons:

• It converts HDMI to RF only and cannot work in the other direction.
• Output is limited to CH3 and CH4, so it cannot feed a digital-only tuner.
• Weight and physical dimensions are not specified.

Best for: A buyer connecting a Fire TV Stick, Roku or console to a single older RF-input TV who wants one box with every cable included.

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What sets the kurtmark apart is the bundle. The upxuntek CH3/CH4 Modulator and VQP HDM61 VHF Modulator use the same CH3/CH4 approach, but only this kit lists a coax cable alongside the HDMI lead. That removes the most common first-day problem, which is finding an RG6 cable of the right length.

On the signal side, the listed 80 ± 5 dBµV output and PLL control point to a unit built for a short run into one television. It accepts HDMI 1.4 sources with HDCP 1.4, which covers streaming sticks, Apple TV, PS5, Xbox, Switch, PCs and DVD players. Compared with the ADRFClub HDMI/RCA UHF Modulator, it has fewer tuning options but also fewer settings to get wrong.

It is the wrong choice if you need a digital channel or more than one source. For a QAM or ATSC output from a single HDMI feed, the Thor Broadcast H-HDMI-RF-PETIT is the listed option that fits. For eight sources, jump to the Thor Broadcast 8-Channel HDMI and SDI.

2. Thor Broadcast H-HDMI-RF-PETIT: Best Compact Digital QAM/ATSC HDMI to Coax Modulator for Single Sources

• Output: DVB-C, DVB-T, ATSC and ISDB-T RF
• Input resolutions: 720p, 1080i and 1080p
• Encoding: HD MPEG2 video with AC3 Dolby audio
• Connectors: HDMI input, F-type output
• Size and weight: 4.06 x 2.52 x 0.94 inches, 9.6 oz

Pros:

• It outputs digital channels, so modern TVs can tune the feed as a regular QAM or ATSC channel.
• At 9.6 oz and under an inch thick, it fits behind a TV or inside a small equipment shelf.
• It accepts sources such as set-top boxes, satellite receivers, HDMI cameras, DVD players and computers.
• A 1-year warranty is listed.

Cons:

• Configuration is done from a PC using the manufacturer's own interface, which adds setup time.
• It does not output analog NTSC, so it will not drive a CRT without a digital tuner.
• Channel count is not specified, so it should be treated as a single-feed unit.

Best for: A user sending one camera, receiver or player to several digital TVs over existing coax.

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The Thor Broadcast H-HDMI-RF-PETIT is the entry point to digital modulation in this list. It combines MPEG2 encoding with AC3 audio and an internal digital modulator, and you pick the RF channel yourself. That is a different job from the CH3/CH4 boxes ranked above it.

Against the SatLink ST-7000, which also targets ATSC or QAM from a single HDMI source, the Thor is the lighter and more fully described unit. The SatLink lists a 3.2 lb body, while the Thor weighs 9.6 oz and lists its encoder details.

It is the wrong choice for plug-and-play use with an old television, since the PC-based setup is unnecessary there. Pick the kurtmark HDMI to RF Modulator Kit for that. If you need several sources at once, step up to the Thor Broadcast 8-HDMI QAM Modulator.

3. VQP HDM61 VHF Modulator: Best Fixed-Channel VHF HDMI to Coax Modulator for Retro Gaming

• Output: NTSC, CH3 at 61.25 MHz and CH4 at 67.25 MHz
• Input resolutions: 1080P, 1080i, 720P, 576P, 576i and 480p
• Standards: HDMI 1.4 and HDCP 1.4
• Power: 5V DC at 0.5 A
• Size: 5 x 4 x 1.1 inches, ABS construction

Pros:

• Exact CH3 and CH4 frequencies are published, which helps when tuning an old set manually.
• No driver installation is needed, so it works straight from the box.
• It accepts a broad range of input modes, including 576i and 480p.
• Buyer feedback points to easy setup and a good fit for reviving CRT TVs.

Cons:

• Picture and sound quality draw mixed feedback, with some reports of blur and audio feedback.
• It is larger than the upxuntek and RQG units at 5 x 4 inches.
• Weight is not listed.

Best for: A retro gamer connecting a modern console, handheld or PC to a CRT that only has an antenna input.

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The VQP HDM61 is the clearest fit for retro use in this list. Buyers report running low-resolution modes such as 640×480 from handheld PCs, which is exactly where a CH3/CH4 modulator makes sense. The fixed VHF frequencies keep configuration simple.

Compared with the kurtmark HDMI to RF Modulator Kit, it ranks lower because the accessory set is less clearly described and picture quality reports are inconsistent. If the image looks soft, setting the console to 480p is the most practical fix.

It is the wrong choice if you need to feed a UHF-only set or switch between NTSC and PAL. The ADRFClub HDMI/RCA UHF Modulator covers both. It also cannot take a composite source, which the RQG VHF UHF Modulator can.

4. ADRFClub HDMI/RCA UHF Modulator: Best Dual-Input VHF/UHF HDMI to Coax Modulator for Mixed Sources

• Inputs: HDMI 1.3 or CVBS RCA composite with stereo audio
• Formats: NTSC and PAL
• Frequency: VHF and UHF, up to 136 channels
• Controls: Digital channel display and selector switch
• Connectors: F-type coax in and RF out, clip mount

Pros:

• It accepts either HDMI or composite RCA, so a VCR and a streaming stick can share the same box.
• The channel display and switch make retuning easier than on fixed CH3/CH4 units.
• Audio volume and video brightness are adjustable.
• A coax input and separate RF output let it extend an existing antenna signal to other TVs.

Cons:

• Instructions are the most common complaint and several buyers reached a working setup only by trial and error.
• Reports of a unit failing after a few months have appeared.
• Value-for-money opinions are split.

Best for: A hobbyist feeding both HDMI and composite sources into a CRT or several rooms of analog TVs.

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The ADRFClub is the most flexible analog box here. With 136 channels across VHF and UHF, plus NTSC and PAL, it can dodge a channel that suffers interference, which a CH3/CH4 box cannot do. Buyers who live near a router or other RF noise often shift to a different channel for that reason.

The trade-off is a fiddly setup and thin documentation. Compared with the RQG VHF UHF Modulator, which also takes HDMI and RCA, the ADRFClub adds a digital channel readout, but both need patience.

It is the wrong choice for a first-time buyer who wants zero fiddling: the kurtmark HDMI to RF Modulator Kit is simpler. It is also not a digital QAM or ATSC product, so use the Thor Broadcast H-HDMI-RF-PETIT where digital channels are required.

5. SatLink ST-7000: Best Single-Channel ATSC/QAM J.83B HDMI to Coax Encoder for Coax Networks

• Output: HD ATSC or QAM (J.83B) channel over coax
• Resolution: Up to 1080p
• Channels: 1
• Interfaces: HDMI and RCA
• Size and weight: 10 x 6 x 3 inches, about 3.2 lb (1.47 kg)

Pros:

• It is a digital modulator and encoder in one, aimed at coax networks rather than a single old TV.
• The J.83B QAM standard matches North American cable systems.
• The 1.47 kg body is heavier than the pocket-size modulators, which suits fixed installation.
• A single clear model number makes it easy to identify and support.

Cons:

• Few feature details are published, so audio codec and latency are not specified.
• At 10 x 6 x 3 inches, it takes much more room than the Thor H-HDMI-RF-PETIT.
• Only one channel is supported.

Best for: An installer who needs one HDMI feed delivered as a digital channel on an in-building coax network.

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The SatLink ST-7000 targets the same job as the Thor H-HDMI-RF-PETIT, with less published detail. Where the Thor documents MPEG2 and AC3 handling, the SatLink states only 1080p delivery as ATSC or QAM, so you are choosing on trust more than specification.

It is the wrong choice if you need multiple channels, since it is listed with one. The Thor Broadcast 8-Channel HDMI and SDI is the listed answer there. If you only want to feed a CRT, the upxuntek CH3/CH4 Modulator is far smaller and simpler.

6. RQG VHF UHF Modulator: Best Adjustable-Level HDMI/RCA to Coax Modulator for Multi-TV Analog Feeds

• Inputs: HDMI and CVBS RCA
• Frequency: VHF and UHF
• Formats: PAL and NTSC, 1080P to 480p input
• Output: F female connectors, adjustable AV level
• Weight: 13.4 oz, ABS and metal construction

Pros:

• The AV output level can be adjusted, which helps match different TV sensitivities.
• Buyers have driven several TVs from one HDMI source, including seven in one location.
• It accepts HDMI or composite and outputs on VHF or UHF.
• Metal and ABS construction feels more solid than all-plastic boxes.

Cons:

• Some buyers report a defective audio subcarrier control.
• Some reports describe it failing within a year.
• Dimensions of the unit and power details are not specified.

Best for: A user splitting one source across several analog TVs who needs to trim the output level.

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The RQG distinguishes itself with level adjustment. When one modulator feeds several TVs through a splitter, signal level matters, and the front-panel adjustment lets you compensate. The ADRFClub HDMI/RCA UHF Modulator offers similar input flexibility but has a channel display in its place.

Reliability reports make it a risk for permanent installs. It is the wrong choice for a long-term hospitality or signage setup, where one of the Thor digital units is better. For a casual single-TV setup, the upxuntek CH3/CH4 Modulator is smaller.

7. upxuntek CH3/CH4 Modulator: Best Compact Pass-Through HDMI to Coax Modulator for Antenna TVs

• Output: NTSC with CH3/CH4 switch, 75 ohm coax
• Input: Up to 1080P, HDMI 1.4 and HDCP 1.4
• Pass-through: RF IN and RF OUT ports
• In the box: 4 ft HDMI cable, 5V adapter and power cable
• Size and weight: 3.46 x 2.56 x 1.02 inches, 1.78 oz

Pros:

• At 1.78 oz it is the lightest unit in this list.
• The RF IN and RF OUT ports let an antenna signal pass through the same connection.
• A physical CH3/CH4 switch avoids menu settings.
• A 1-year manufacturer warranty is listed.

Cons:

• It does not include a coax cable, unlike the kurtmark kit.
• Output is NTSC only.
• No buyer feedback is available to confirm long-term behavior.

Best for: Someone who wants to keep an antenna connected to an older TV while adding an HDMI device.

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The upxuntek is the antenna-friendly option. Its RF pass-through is the feature that separates it from the kurtmark HDMI to RF Modulator Kit and the VQP HDM61 VHF Modulator, which list only an RF output.

It is the wrong choice if you want a coax cable in the box or PAL output. For the cable, choose the kurtmark kit. For PAL and UHF, choose the RQG VHF UHF Modulator.

8. Thor Broadcast 8-HDMI QAM Modulator: Best 8-Port HDCP-Capable Digital HDMI to Coax Modulator for Distribution

• Ports: 8 HDMI
• Output: QAM, ATSC and ISDB-T
• Input: SD and HD up to 1080p/60
• Encoding: MPEG2 video, AC3 Dolby audio
• Weight: 9.4 lb (4.26 kg listed)

Pros:

• Eight HDMI ports let one device serve eight sources.
• HDCP support means it works with any HDMI source, including protected set-top boxes.
• Closed captioning (608/708) can be fed through a CVBS baseband input.
• It is described as low latency and able to drive many TVs at any distance.

Cons:

• At roughly 9.4 lb, it is a rack or shelf unit rather than a portable one.
• Output channel mapping per input is not detailed.
• It is a poor fit for a single old TV.

Best for: A venue or building that needs several live HDMI feeds put onto its coax network.

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This Thor Broadcast unit is the closest match to the keyword for buyers who want eight HDMI inputs in one chassis. Its 1080p/60 input, MPEG2 video and AC3 audio match the other Thor digital modulators, but it adds the port count and closed-caption input.

Compared with the Thor Broadcast 8-Channel HDMI and SDI, it has fewer documented controls. Where that model describes individually selectable modulation per channel, this one says less about how its eight channels are configured.

9. Thor Broadcast 8-Channel HDMI and SDI: Best Independent 8-Channel Hybrid HDMI to Coax Modulator for Headends

• Inputs: 8 independent HDMI and SDI, selectable per channel
• Output: 8 separate RF channels in QAM, ATSC 8VSB, DVB-T or ISDB-T
• Video: Up to 1080p/59.94/60, plus 1080i, 720p and 480i
• Encoding: MPEG2 video up to 25 Mbps, with Dolby AC3, MPEG1 Layer 2 and AAC audio
• Weight: 9 lb

Pros:

• Each of the 8 channels can be set to its own frequency and modulation standard.
• Every channel can take either HDMI or SDI, which suits mixed camera and player setups.
• DVB-C Annex A and B support includes QAM 64 and QAM 256.
• Audio encoding options cover Dolby AC3, MPEG1 Layer 2 and AAC.

Cons:

• It is a headend device, and configuration happens through a GUI that takes planning.
• At 9 lb, it needs a stable shelf or rack.
• It is excessive for one or two sources.

Best for: A church, school or hotel that wants eight live sources on eight separate RF channels.

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This is the only listed product that delivers a true eight-channel hybrid design in the sense the keyword implies: eight inputs, eight independent outputs. Being able to mix modulation standards across channels, such as QAM on two and ATSC on three, is what makes it useful in a building with mixed TV types.

For smaller needs, a 4 channel QAM modulator is the usual step down in size, and for IP delivery a 4 channel IPTV encoder covers the networked side. Within this list, the Thor Broadcast 8-HDMI QAM Modulator is the simpler eight-port alternative if you do not need SDI.

It is the wrong choice for one TV or a gaming setup. Pick the kurtmark HDMI to RF Modulator Kit there.

10. Thor Broadcast Rack-Mount QAM Modulator: Best 19-Inch Rack HDMI to Coax Modulator with Web Control

• Form factor: 19-inch rack mountable, 19 x 12.9 x 1.7 inches
• Output: DVB-C QAM, ATSC, DVB-T and ISDB-T with dynamic switching
• Input: HDCP-compliant HDMI up to 1080p/60
• Latency: 50-100 ms
• Weight: 10 lb

Pros:

• It mounts in a standard 19-inch rack.
• Control is through a web-based network management system with web updates.
• Latency is stated at 50-100 ms, useful for live sources.
• Closed captioning can be fed through an analog CVBS RCA input from Line 21.

Cons:

• Number of HDMI inputs and RF channels is not listed.
• At 10 lb it is the heaviest unit here.
• Its size makes it unsuitable for home use.

Best for: An integrator filling a rack who values remote management over compactness.

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The rack-mount Thor Broadcast modulator is defined by its web management and stated latency. Neither of the other Thor units here lists those details so clearly, which matters when you maintain a system remotely.

Its weakness is the missing channel count. If you specifically need eight outputs, the Thor Broadcast 8-Channel HDMI and SDI documents them directly. For a small home install it is the wrong choice, and the Thor Broadcast H-HDMI-RF-PETIT does the digital job in a far smaller body.

Buyer's Guide: How to Choose the Right 8 Channel HDMI to Coax Modulator

The core trade-off is simplicity against capacity. Small analog boxes like the kurtmark HDMI to RF Modulator Kit are cheap in effort, but serve one TV and one source. Digital headend units like the Thor Broadcast 8-Channel HDMI and SDI serve many, but need planning.

Before choosing, check these project details:

• Receiving TV type: Analog CRTs need NTSC CH3/CH4 or VHF/UHF output, while digital tuners need QAM or ATSC.
• Number of sources: One source suits a small box, while several need an eight-port unit.
• Input type: Decide whether you need HDMI only, HDMI plus RCA, or HDMI plus SDI.
• Cabling: Confirm whether a coax lead and HDMI cable are included.
• Installation space: Rack and 9-10 lb units need a shelf or rack, while small ones sit behind a TV.

Output Standard and Tuning Range

Analog output suits old televisions. The VQP HDM61 VHF Modulator and upxuntek CH3/CH4 Modulator use fixed channels, while the ADRFClub HDMI/RCA UHF Modulator and RQG VHF UHF Modulator cover VHF and UHF.

Digital output suits modern TVs and shared coax networks. The Thor Broadcast H-HDMI-RF-PETIT and SatLink ST-7000 each put one feed on a QAM or ATSC channel, and the larger Thor units extend that to multiple outputs.

Input Count and Source Types

Most small modulators take one HDMI input. The ADRFClub and RQG add composite RCA, which helps if a VCR or older console is part of the setup.

For several sources, the Thor Broadcast 8-HDMI QAM Modulator has eight HDMI ports, and the Thor Broadcast 8-Channel HDMI and SDI adds SDI selection per channel. Buyers who outgrow eight channels may look at a 16 channel encoder for the source side.

Channel Capacity and Distribution Scale

Single-channel units are fine for one room. Once you want different sources on different TVs, you need separate RF channels, as on the Thor Broadcast 8-Channel HDMI and SDI.

The rack-mount Thor does not state its capacity, so confirm it before purchase. For a building that needs only a few outputs, a 4 channel QAM modulator class of product is a smaller target.

Build, Power and Support

Small boxes run on 5V adapters, as listed on the kurtmark and upxuntek units. Larger Thor devices use North American 2-pin plugs and weigh around 9-10 lb.

Reliability varies. Buyers have reported failures on the ADRFClub and RQG after months of use, while the upxuntek lists a 1-year manufacturer warranty and the Thor H-HDMI-RF-PETIT lists a 1-year warranty.

Frequently Asked Questions About 8 Channel HDMI to Coax Modulators

What Does an HDMI to Coax Modulator Do?

It converts an HDMI video source into an RF signal that travels over coax cable to a TV. Analog units like the kurtmark HDMI to RF Modulator Kit output on CH3 or CH4. Digital units like the Thor Broadcast H-HDMI-RF-PETIT output QAM or ATSC channels.

Which Modulator Has Eight Channels?

The Thor Broadcast 8-Channel HDMI and SDI is listed with eight independent inputs and eight separate RF outputs. The Thor Broadcast 8-HDMI QAM Modulator has eight HDMI ports. The rest of the list is mostly single-source.

Can I Connect a Game Console to an Old CRT TV?

Yes, if the TV has a coax input. The VQP HDM61 VHF Modulator and upxuntek CH3/CH4 Modulator suit this, and buyers use 480p modes for best results. Set the TV to channel 3 or 4 to match the switch.

Do These Modulators Work for RF to HDMI?

No. Both the kurtmark and upxuntek units convert HDMI to RF only. Neither reverses the signal.

Can One Modulator Feed Several TVs?

Yes, through a coax splitter. The RQG VHF UHF Modulator has an adjustable output level that helps, and buyers have run several TVs from it. Digital units like the SatLink ST-7000 suit shared coax networks.

What Is the Difference Between Analog and Digital Modulators?

Analog units send an NTSC or PAL signal that old tuners read. Digital ones such as the Thor Broadcast Rack-Mount QAM Modulator encode video as QAM or ATSC. Choose based on what the receiving TV can tune.

Final Verdict: Which 8 Channel HDMI to Coax Modulator Should You Buy?

Best 8 Channel HDMI to Coax Modulators for most home buyers start with kurtmark HDMI to RF Modulator Kit: it outputs NTSC on CH3/CH4, accepts 1080P to 480P input, and includes an HDMI cable, RG6 coax and power supply. Its main weakness is that it serves one source and one analog TV only.

For other uses, the Thor Broadcast H-HDMI-RF-PETIT suits digital QAM or ATSC delivery from one source, and the VQP HDM61 VHF Modulator suits retro gaming. The ADRFClub HDMI/RCA UHF Modulator and RQG VHF UHF Modulator fit mixed HDMI and composite sources, and the upxuntek CH3/CH4 Modulator is the pick for keeping an antenna connected.

For real multi-source work, the Thor Broadcast 8-Channel HDMI and SDI offers eight independent outputs, the Thor Broadcast 8-HDMI QAM Modulator gives eight HDMI ports, and the Thor Broadcast Rack-Mount QAM Modulator adds rack mounting and web control. The SatLink ST-7000 fits a single digital feed. If you are still undecided, count your sources and check whether your TVs tune analog or digital channels, then choose the smallest unit that covers both.