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Description
Contemporary Research QCA9-33 Active RF Combiner with 8 High-Level + 1 Low-Level InputsThe Contemporary Research QCA9 33 is an active RF combiner that includes eight high level inputs and one low level input, combining with high isolation as well as amplifying up to a 33 dBmV output level. Designed for QMOD HDTV applications, the eight RF inputs typically receive 29 dBmV RF from QMOD HDTV modulators. The ninth input is for up to 19 dBmV RF signals, such as incoming cable feed, a control channel from an ICE HE Head End control modulator,
The Contemporary Research QCA9-33 is an active RF combiner that includes eight high-level inputs and one low-level input, combining with high isolation as well as amplifying up to a 33 dBmV output level. Designed for QMOD HDTV applications, the eight RF inputs typically receive 29 dBmV RF from QMOD HDTV modulators. The ninth input is for up to 19 dBmV RF signals, such as incoming cable feed, a control channel from an ICE-HE Head End control modulator, or any other QMOD or QCA9-33. Up to eight QCA9-33 combiners can feed a single combiner to deliver up to 76 channels. The low-noise, wideband 860 MHz amplifier compensates for combining losses and adds 3 dBmV of gain, typically supplying a total output of up to 33 dBmV. This compact unit mounts in a single rack space using CR RK1 and RK-2 rack kits (available separately), and can be mixed with QMOD HDTV modulators using the same rack kits.
Product Highlights
- Compatibility
- QMOD HDTV modulators
ICE-HE Head End control modulator
QDA4-45 amplifier combiner
- Tunes analog and digital channels in ATSC, NTSC, and clear QAM formats
- Combines eight high-level channels (QMOD 29 dBmV) and one low level input (cable, ICE-HE at 10-18 dBmV)
- Cascade multiple units for up to 72 channels in one array
- Low-noise, 860 MHz wideband amplifier
- Compensates for combining losses and adds 3 dBmV gain
- Provides a maximum output level of up to 33 dBmV
- Provides high-isolation combining
- Operates with an extremely low noise figure of 1.8, low power of less than 2W
- Compact metal enclosure, mounts in 1 RU using RK1 and RK2 rack kits (available separately)
- Made in USA
Applications
- Use the QCA9-33 as a 9-channel, 30 dB amplifier for small to medium-sized RF applications
- Can be used with nine QMOD modulators, or eight QMOD modulators plus ICE-HE Head End, or eight QMOD modulators plus cable feed
- Feed output to a second CCA9-33 to combine up to 17 channels
- Feed eight QCA9-33 units to one QCA9-33 to combine 64 or more channels without signal loss
- Feed four QCA9-33 units into a QDA4-45 to distribute up to 36 channels
- Feed combined output to a launch amplifier for larger systems
In the Box
Contemporary Research QCA9-33 Active RF Combiner with 8 High-Level + 1 Low-Level Inputs
- PS12-500 12 VDC, 500 mA Power Supply
- Limited 2-Year Warranty
| Connectors | Back Panel: 8 x High-level input F connector 1 x Low-level input F connector 1 x Amp out F connector 1 x DC power input (2.1 mm coaxial jack, inside center conductor positive) |
| Maximum Input | High-level: 30 dBmV Low-level: 19 dBmV |
| Isolation | 38 dB typical, 30 dB minimum, 54 to 860 MHz |
| Return Loss | Input: 30 dB typical Output: 20 dB typical |
| Output | 17 dBmV amplifier, extremely low noise, linear performance through 860 MHz Net +3 dB gain after combining |
| Maximum Level | +33 dBmV |
| Composite Triple Beat | -75 dBc, 132 channels at +30 dBmV per channel |
| Noise Figure | 1.8 typical |
| LED Indicator | 1 x Power LED |
| Power Requirements | 11.5 to 15 VDC, 12 VDC typical (may be unregulated) 170 mA maximum |
| Enclosure Type | Rack mountable metal enclosure |
| Dimensions (W x H x D) | 8.5 x 1.75 x 6.0" (216 x 44 x 153 mm) |
| Weight | 1.1 lb (500 g) |
Shipping Notes
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Exchange/Return Notes
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- Final sale items are not eligible for returns or exchanges.
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4.4 ★★★★★
Based on 2017 reviews
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Product Reviews
★★★★★ 5
Nice wrist rest
Size: 100% Standard
Comfortable angle, solid enough to not move around but soft enough to be good for long term usage.
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Excellent wrist rest, BUT not for me
I'm rating this wrist rest 5 stars despite the fact that it's not for me. The reason that it is not for me is simple: My palms get very sweaty, and this makes my palms stick to the wrist rest, making it hard to move my hands around. This is an inherent limitation of the fact that it is made out of wood, and drove me to the 17" x 4" x 0.75" foam wrist rest from Grifiti instead.
If you don't have sweaty palms, however, this wrist rest is perfect. It is 4 inches deep instead of the typical 3.1 inches, it is the perfect height and tapered just so for maximum comfort, the wood (Golden Oak color) is beautiful, and the engraved logo is tasteful and non-intrusive.
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Reviewed in the United States on October 10, 2023
★★★★★ 5
The perfect wrist rest. Stop looking, just buy this one!
Color: Onyx, Size: Tenkeyless/TKL Keyboard Wrist Rest, Color: Onyx, Size: Tenkeyless/TKL Keyboard Wrist Rest
The perfect wrist rest. I used those gel and silicone wrist rests thinking the softer they are the better. Not so. This is solid hardwood and my wrists no longer ache after a long day at the computer. The size I picked is perfect for a TKL keyboard. The angles, height, and design are optimal for a comfortable typing experience. Even 8-10 hours of typing!
I love Glorious' products, they come so well packaged and attention to every detail is given. Gosh, its just a wrist rest! No, it is a tool that provides comfortable work experience.
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Reviewed in the United States on September 4, 2025
★★★★★ 5
The wood is great.
I used to use a typical padded wrist pad, but am a heavy sweater. Upon reading another review in regards to that matter I decided to take the plunge on this rest. I have been a user of the Model O mouse from Glorious for a while and liked it so I trusted the company's reputation for taking gamers' needs into consideration.
After using it for about a week and playing different types of games/working from home on it, I can say that although your sweat might pool during sweaty moments, it's easy to wipe off and doesn't seem to easily absorb into the wood.
The wood itself is of a nice quality, I like the oak over the onyx for a more "real wood" look. There was no difference in comfort for me, you'd think being used to a padded wrist this shift would be "hard" on me, but no, I haven't had any problems. It's ergonomics for typing are also good as I notice my WPM and consistency be higher on multiple tests.
All-in-all quite satisfied with the purchase, fits the aesthetic, feel, and ergonomics I was looking for.
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Reviewed in the United States on March 2, 2021
★★★★★ 5
Very well made, matches width of Keychron Q6 perfectly, great for bigger hands!
This is a nicely finished slab of wood that is an EXACT match for my Keychron Q6 in both width and height. Depthwise, this is 4", so if you got larger hands (as I do), this is a bit better than the silicone Keychron version which I believe is 3.5" or so in depth. The non-stick feet are a nice feature, and the profile is wonderful to type on. Only issue with the item I received is a small nick right below the Glorious emblem on the lower right of the wrist rest - may have been an errant tool mark. However, this doesn't detract in my own opinion, from the well-designed profile and features of this wrist rest and was easily covered with a furniture marking pen. I'm still giving this item 5-stars and getting another one for the office!
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Reviewed in the United States on May 7, 2025