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Author Topic: New xKu LNBF  (Read 4625 times)

DrSat

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New xKu LNBF
« on: August 16, 2014, 10:35 am »
When your dish receives signal from the satellites in orbit, the signal must be converted
 into something your receiver can unscramble. The device that is used to accomplish this is called a “low noise block-amplifier feedhorn,” or LNBF. This is positioned at the end of the dish support arm. There are a few different types of LNBFs available, but as of last year, the main one currently being installed is the xKu LNBF.

The LNBF receives the raw signal directly from our satellites – Anik F1R, Anik F2 and Anik G1. The signals are then amplified and the frequencies are changed before they make it to your receiver. It will split the signal up into different polarization and frequency.


15_lnb height=207
Shaw Direct’s quad LNBF is on the left, and the new xKu LNBF to enable reception of the Anik G1 third satellite is on the right.
                             15_waves height=202
This is an example of how the waves travel from the satellite to your dish.
Shaw Direct uses two polarities for its service – horizontal and vertical, which both require a different electric voltage to activate (10.5 to 14.2 volts for vertical, and 15.2 to 21.0 volts for horizontal). Each polarity has a different range of electromagnetic wave frequencies that all of the channels are transmitted over. Channels are “stored” on areas of the satellite called “transponders,” each of which has a unique frequency.

As we currently have two satellites in orbit, a quad LNBF will allow for the four polarities to be received (namely the horizontal and vertical on Anik F1R, and the horizontal and vertical on Anik F2). When our third satellite is launched, we’ll need to use the new xKu LNBFs to receive the extra two polarities from Anik G1.
While “quad” refers to the number of polarities that can be received, “xKu” refers to the extended Ku-band that Anik G1 will use. The normal Ku-band that Anik F1R and F2 use is a portion of the electromagnetic spectrum in the microwave range of frequencies. The extended Ku-band just uses a slightly larger spectrum than Ku.

If you’re ever wondering if your LNBF is working correctly, there are a few simple things you can do to find out. We always want to make sure that you’re able to receive channels from both of our current satellites, and each polarity, so you can check out the following channels:
SatellitePolarityClassic Channel NumberAdvanced Channel Number
Anik F1RVertical299299
Anik F1RHorizontal300058
Anik F2Vertical350070
Anik F2Horizontal700700
You might not be subscribed to all of those channels, but the front panel of your receiver will tell you what you need to know. If you have one of our 6XX-series receivers, look for a little red light; if it’s on, your receiver isn’t getting signal for that channel. If you have any of our other receivers, look for a light shaped like a tiny satellite dish; if it’s red, you have no usable signal.

Once you’ve checked, you can use your results to help figure out the issue. If you’re missing both channels from Anik F1R or F2, both vertical channels, or both horizontal channels, it’s possible that you may need a replacement xKu LNBF.
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joshua minaya

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Re: New xKu LNBF
« Reply #1 on: January 10, 2015, 10:29 am »
What then would be the major selling point for this new LNBF.

sparkycivic

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Re: New xKu LNBF
« Reply #2 on: January 15, 2015, 08:02 pm »
The new LNBF gives you access to the new transponder frequencies from the Anik G1 satellite, which is online now.

 Many new channels and timeshift options have been made available by using the new transponders.  To get those new channels, your receiver also needs to be capable of decoding MPEG4, which rules-out all of the original large size models, and the DSR-209. 

Eventually all channels even on the other satellites will probably change to MPEG4, because it fits more channels onto the same satellite.  The satellites get full of channels and then they can't add any more, which is what happened before they got Anik G1 launched.  They couldn't FORCE all the customers to trash their old non-MPEG4 capable receivers, therefore, they had to launch the third satellite to add the channels the customers wanted.  Now they will try to find ways to get rid of the rest of the old receivers in the coming years so that they won't have to launch any more satellites for as long as possible.

Old receivers hooked up to the new style XKu LNBF's will work just fine but won't receive any of the new channels. It also needs to be reprogrammed by Shaw Direct when hooked up to the new LNBF, so you can't just "swap-in" the new one and expect it to work immidiately.

The new LNBF is bigger because the new frequencies are LOWER in frequency(MHz) compared to the other satellites. Lower frequency means LONGER wavelength, which is a fundamental property when making LNBF's because it controls the size of the inlet horns. 

Does this answer help?

 

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