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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
4.7 ★★★★★
Based on 30 reviews
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Product Reviews
★★★★★ 5
Perfect earring tree
Color: Bronze
I was so tired of fumbling through a handful of tangled earrings in my jewelery box every morning - went looking for something to organize them and found this lovely tree. Since I am a admirer of all things bird, the design appealed to me. I was a bit worried it might be too garish, but was pleasantly surprised. The burnished copper-like finish is quite nice, and the embossed designs on the trunk and leaves give it a three-dimensional look. The nest is sturdy and holds my rings and bracelets, and I could hang necklaces from the branches (but I have another place for those.) I was worried it would be too large for my counter top - it is 17" tall x 15" wide - but it works well as a decorative piece. The sturdy base (7"x3") provides stability. Lots of holes for earrings and works just as well for dangles as for posts. All in all I am very pleased with this purchase. It came in a sturdy box and only one leaf was slightly crimped, which was easy to gently bend back into shape. And best of all - no more tangled mess of wires and hoops to sort out each morning!
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Reviewed in the United States on April 26, 2012
★★★★★ 5
Great earring tree!I
Color: Silver, Color: Silver
I like this earring tree more than I’d expected to! It holds a lot of earrings, is very sturdy and stable, and cute. It also has a little nest basket where you can put items like bracelets and rings. I love that I can see my earring options, and find the ones that best go with my outfit when getting ready for work in the morning. I’m glad it’s metal, almost a work of art, vs cheap plastic. It’s a pleasure to look at, not just functionally useful.
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Reviewed in the United States on June 2, 2022
★★★★★ 5
Exactly what I wanted!
It is really exactly what I was looking for. I've been living with my jewelry in ziplock bags since we moved over here and everything fits perfect. I saw some reviews that claimed it was unstable but I tested it and it seems sturdy though I'm not hanging heavy pieces. It is a nice size and I love the little ring basket. It also feels pretty decent quality too. Glad I got the black one as I'm not sure where I have it that the copper/bronze would look right. I think it is elegant, practical and I wish I could post a photo with my pieces on it to show that it really holds things beautifully.
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Reviewed in the United States on September 6, 2014
★★★★★ 4
Looks great by my bed!
Even my boyfriend keeps commenting how much he likes it. It's a usable piece of art!
I will comment that the earring holes can be a little tricky since the leaves are turned all different ways. You have to be strategic with how you line up your long/dangle-y earrings with your studs so everybody fits and can be seen. A little tricky. But not a deal breaker - especially when it's so easy on the eye.
The other slight negative is that this really isn't the best necklace holder. I would have thought, "No problem!" But it's a bit awkward. Especially if you actually intend to see all your earrings. You'll end up hanging most of your necklaces from the top most branch - but they slide down into the crevice to stay. Then you've got a lot of overlapping. And trickiness to retrieve the exact necklace you want with ease.
However, this is still a fabulous earring tree. I can't say enough good things about it. Love the little basket for miscellaneous. Hair bands, lip gloss, etc.
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Reviewed in the United States on April 30, 2014
★★★★★ 5
Beautiful jewelry display
Color: Bronze-Tone
A few rough edges, but all in all well made and attractive. Holds lots of earrings and I can drape my necklaces on the tree. There's a nice bowl for bracelets and a nice tray that forms the base.
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Reviewed in the United States on April 27, 2024
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