Pay in installments of $8560.62 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 31 - Aug 5
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Contemporary Research QDA4-45 RF Distribution Amplifier & CombinerThe Contemporary Research QDA4 45 is an amplified RF combiner that can switch between one or four inputs, with adjustable amplification up to 50 dBmV. You can add up to 32 dBmV gain for one input, and 25 dB for four inputs. Designed for QMOD HDTV applications, the unit can receive an RF feed from QMOD modulators or QCA9 33 active combiners. Inputs can be switched between one or four inputs, with selectable gain. This compact unit mounts two across in
The Contemporary Research QDA4-45 is an amplified RF combiner that can switch between one or four inputs, with adjustable amplification up to 50 dBmV. You can add up to 32 dBmV gain for one input, and 25 dB for four inputs. Designed for QMOD HDTV applications, the unit can receive an RF feed from QMOD modulators or QCA9-33 active combiners. Inputs can be switched between one or four inputs, with selectable gain. This compact unit mounts two-across 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.
Compatibility
-
- QMOD HDTV modulators
- QCA9-33 active combiner
Product Highlights
-
- Switches between one input or four input combiner
- Adds up to 32 dBmV gain for one input, 25 dB for four inputs
- Adjusts RF gain from front-panel controls and LCD display
- Provides a maximum output level of up to 50 dBmV
- Wideband, low-noise amplifier
- Low power, draws less than 8.5W
- Compact metal enclosure, mounts 2 across in 1 RU using RK1 and RK2 rack kits (available separately)
- Made in USA
Applications
-
- Use the QDA4-45 as a 4-channel, 45 dB amplifier for larger RF applications
- Combine up to four QMOD modulators
- Combine four QCA9-33 active combiners for 36 channels
- Use as launch amplifier for the RF system
- Use as booster amplifier to merge QMOD channels with existing 50 dB analog modulator systems
| Front Panel | Input Selection: 1 or 4 inputs (green LED indicators) RF Gain Selection with LED Display: 0 to 25 dB for four inputs, 0 to 32 dB for one input |
| Back Panel | 4 x 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 | 40 dBmV |
| Isolation | 38 dB typical, 30 dB minimum, 54 to 860 MHz |
| Return Loss | Input: 30 dB typical, 13 dB in single input mode Output: 17 dB typical |
| Output | Input 1: 0 to 32 dBmV gain, low noise, linear performance through 860 MHz All Inputs: 0 to 25 gain (7 dBmV loss from combiner) |
| Maximum Output Level | +50 dBmV |
| Composite Triple Beat | -60 dB, 134 channels at +44 dBmV per channel |
| Noise Figure | 4.5 typical |
| LED Indicators | 1 x Power LED 2 x Green LEDs for input selection |
| Power Requirements | 11.5 to 13 VDC, 12 VDC typical 700 mA maximum |
| Enclosure | Durable metal enclosure, rack mountable |
| 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) |
| Packaging Info | |
|---|---|
| Package Weight | 1.9 lb |
| Box Dimensions (LxWxH) | 13.1 x 9.5 x 3.3" |
In the Box
Contemporary Research QDA4-45 RF Distribution Amplifier & Combiner
- PS12-1 1A 12 VDC Power Supply
- Limited 2-Year Warranty
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 19 reviews
Sort
Product Reviews
★★★★★ 5
Excellent buy
Color: pink
I ordered this case for my new IPad. This case is awesome! Not flimsy and bulky. I loved that it had a screen saver included in the case. It was easy to put on my IPad. Snapped together good. The price was excellent! The case keeps all dust off the screen. The screen is easy to clean. I highly recommend this case!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 29, 2026
★★★★★ 5
Perfect case for my daughter’s iPad
Color: Purple Pink
bought this case for my daughter.
The fit is perfect — all the buttons and camera line up exactly and it snaps on securely.
The case feels sturdy, protective, and durable but not too heavy, so she can still carry it comfortably.
The stand feature is convenient. The design is also super cute — Luna loves it
Overall, great quality for the price. I would definitely buy it again
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 15, 2026
★★★★★ 5
Perfect case
Color: Purple Pink
Great protection for my IPad. I’m always dropping something. This case was pretty easy to install and has the protection over the glass front. No problem using the iPad with the cover. Cute colors and has a loop to store the pen
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 9, 2026
★★★★★ 5
Very versatile!
Color: Colorful Pink
I got this iPad case for myself and my two year-old daughter as we both use this iPad. This case has definitely held up very well. I love the material because it’s nonslip so it’s easy for my two-year-old to hold I also love the movable and adjustable prop on the back that also doubles as a handle. There is two spots to put your Apple Pencil, so that’s very neat. It is a little bit bulky, but it is very protective and I think that is a good trade-off. There is also a cover for the charging port to prevent dust from getting in there or any spills. At first I was a little bit weary about it having a built-in screen protector, but it’s very clear and does not interfere with using the screen at all, so it’s actually a nice touch. I really love this thing and think it is worth it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 5
Great case
Color: Purple Pink
My daughter loves it and the color is marvelous. It was easy to put on, I would buy again worth my money. Very sterdy as good for kids that love to drop their tablet. I like how its has a strap so your kid can carry it on their over there shoulders.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2026