Apartments for Low Income

Questions and Answers

Your Questions About Duplexer

November 6, 2012

Ruth asks…

SAW Duplexer?

Anyone know of a duplexer that can send ~450MHz to one output and leave 800/1200/1900MHz (basically 800 and up) to the other? I’m looking for a pretty low insertion loss on both bands.

Administrator answers:

Check out TX/RX or wacom. You can put a Bandpass/Bandreject (BpBr) filter on the low low side and one on the high side and operate full duplex. Insertion loss is about 3dB but this can be overcome with some gain antennas and super lowloss feed line.

Linda asks…

Will this duplexer fit?

I currently have an HP Photosmart C4680 printer and am looking to get a duplexer for it. I have already bought one (the one here: ) and it turned out to be the wrong one so I am sending it back. I have continued to look for one and have found this one: . Although it appears that it will fit (based on the shape), I am not certain if it will fit, since nowhere seems to say what printers it is compatible with. Does anyone know if it will work?
Thanks for replying. Actually, despite the fact that there doesn’t seem to be anywhere that has this information, it does definitely support a duplexer. Just looking at the back, there is the space available for it, plus the contacts meant for the duplexer. In addition, when I go into settings on the printer, it even allows me to enable an automatic duplexer. I know the shape of a duplexer doesn’t necessarily mean it will fit, but there are very few duplexers for HP in the first place and this is the only one that appears that it will fit.

Administrator answers:

From what I could find on your particular printer model, it does not support an automatic duplexer. There are no accessories for duplexing available per HP’s documentation. The duplexers you’ve found are for other model printers that are designed for them, but your printer does not appear to support a duplexer. Sorry.

Shape & size of a duplexer does not dictate if it will work with a printer or not.

The first duplexer you found works with these printers:

The second one doesn’t have any usable part numbers or information associated with it to find out what it is compatible with.

Interesting. Well, since it does have an option for the duplexer in the settings, it would seem to suggest that one is available then, but I couldn’t find anyplace that mentioned it. The best thing to do next is to actually call HP and see if they can provide you a part number to order.

Chris asks…

How does resolution, scanning depth and dpi relate to printers?

I’m looking to buy a multi-functioning printer and I am trying to understand if I want the dpi and resolution to be HIGHER or LOWER. Also, the scan resolution; should that be higher or lower? The max scanning bit depth…what does that mean? And what is a duplexer?

Administrator answers:

Important Printer Terminology

Understanding printer terminology helps one to search for, select and operate printers in a better and effective way. One of these important printer terms is DPI which stands for Dots per inch. It is a quantity used to define the resolution of printer images. The higher the DPI, the greater will be the details with which the image is displayed. The term used to measure the printing speed is known as PPM. PPM stands for pages per minute and defines the number of pages printed by a machine in one minute.

Another important term used to define the performance of a printer is bit depth. It defines the number of various color tones linked with a dot. A bit depth of 1 implies 2 colors, a depth of 8 implies 256 colors and that of 24 implies 16.7 million colors. Color balance is a term used to describe the print quality. It is a measure of an image color cast. Duty cycle is the number of printed pages a printer can produce as an output. The higher the duty cycle, the more efficient a printer is considered to be. Fade refers to a point at which the printed photograph appears lighter than the remaining points.

AIO and MFP stand for All in one and Multifunction Printer respectively. These terms refer to machines that are a combination of printer, copier and scanner. An inkjet printer terminology is CYMK which defines the inkjet colors. In CYMK, C stands for cyan, Y stands for yellow, M stands for magenta and K stands for black. A term used as an alternative for printer brand name is OEM which stands for Original Equipment Manufacturer.

Different terms used to explain types of printing are duplex printing, 4×6 printing, 6 ink printing, 7 ink printing and 8 ink printing. Of these, duplex printing refers to two sided printing whereby the printer itself reverses the page after one of the sides has been printed. 4×6 printing produces photograph of snapshot size, while 6, 7 and 8 ink printing technologies employ multiple inks to produce high quality, clear and bright results.

Anti aliasing is an important technology whereby a printer applies mathematical formulae to improve the resolution of character edges. Letter Quality refers to a printer that is able to produce text similar to that produced by a type writer. Near letter quality refers to dot matrix printers which produce text almost similar to that produced by a letter quality printer.

Paper capacity indicates the maximum number of papers or other media a printer tray is able to contain. Print zone refers to the part of the sheet on which the printer is supposed to print. Borderless printing is a terminology used to define a technique whereby photos are produced by a printer with no blank spaces at the edges of the page. Brightness refers to the lightness or darkness of the printed image. A pixel refers to one of the thousand dots of which a digital photograph is made of.

Mandy asks…

What is the need for paired frequencies in FDD?

The radio
frequency band for cellular communication is
paired frequency band and is difficult to find . What is the need for PAIRED frequencies? Does the duplexer require paired frquencies?
I wonder why the need of paired frequencies!
Do you know why?Please tell me!

Administrator answers:

Cellular phones are full duplex (both parties can talk at the same time) so you need two frequencies, one for each caller, if you use frequency-division duplex (FDD).

It would be possible to use a single frequency if you had code-division duplex (CDD), where the go and return paths are differently encoded in some way, but this is not how the system was set up.

William asks…

How do I install the C8955A duplexer unit in a HP 5552 printer for two-sided printing?

I took out the default rear unit. I then slotted in the duplexer unit. All seems fine.

Then I tried printing something. It won’t work. It just prints the normal way one side at a time. If I want to print on both sides I have to do it the manual way. I’ve tried going to Print>Properties, enabling Automatic Two-Sided printing as well as enabling it in the HP printer driver settings but it doesn’t work. Plus the printer seems to react slower than with the default rear unit.

What’s wrong? How do I get it working the way it should?

Administrator answers:

Go to Start / All Programs hp and hp users guide you can configure the printer from there it will be obvious tick the box re: duplexer etc,etc it will work after a bit of adjustment here and there. You can got help from the hp website just google your printer model C8955A re: duplexer setup etc,etc.

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