LNBF vs LNB and DSR-410 questions

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skitheberks

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Mar 26, 2008
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I am a little confused on how an LNBF works versus an LNB on a feedhorn.

1. On a C-band LNB the servo motor moves the wave guide from a signal from the receiver when going from odd to even channel numbers. The LNB gets the Ver or Horz signal and sends it to the receiver.
2. With an LNBF there is only the coaxial cable from the receiver to the LNBF. When I installed it I rotated it enough to get a spot where I got both Horizontal and Vertical channels after I set the receiver for using a LNBF. This is where I get confused. Is there a servo in the LNBF that is controlled by the LNB’s power? I was told there is a servo inside. I do not think there is. I think the LNBF works because of the way the wave guide is set and the fact it receives the signal both vertical and horizontal at the same time and the receiver does the internal “switching” of the polarity. Am I right, if not please explain.
3. The reason why I am asking the above is because the instructions that came with the DSR-410 states you can use a LNB and make sure it is on vertical polarity when on W5. Are all the channels vertical?
4. The Skyvison instructions also show a diagram of a C-band LNF(f) with a high frequency splitter and the passive side of the splitter goes to your analog or 4DTV receiver and the other goes to the DSR-410. If you are using your 4DTV and an LNB how does the DSR control the polarity if you are on a vertical channel and need to be on a horizontal channel on W5?
5. Where do you get one of those splitters? Radio Shack does not have that type, at least my local does not. I would like to use that to hook up my Uniden so when I do move the dish monthly I can land back on W5.
6. Also in 2009, where there still be analog C-band such as the welcome page on W5 / tr 23?
 
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Mr Tony

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Nov 17, 2003
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1. On a C-band LNB the servo motor moves the wave guide from a signal from the receiver when going from odd to even channel numbers. The LNB gets the Ver or Horz signal and sends it to the receiver.
in the inside of the LNB there is a skew notch...just one. The servo motor moves it from veritcal to horizontal.....the servo turns that notch

2. With an LNBF there is only the coaxial cable from the receiver to the LNBF. When I installed it I rotated it enough to get a spot where I got both Horizontal and Vertical channels after I set the receiver for using a LNBF. This is where I get confused. Is there a servo in the LNBF that is controlled by the LNB’s power? I was told there is a servo inside. I do not think there is. I think the LNBF works because of the way the wave guide is set and the fact it receives the signal both vertical and horizontal at the same time and the receiver does the internal “switching” of the polarity. Am I right, if not please explain.
the LNBF's have 2 notches 90 degrees apart from each other. That is how you can get both polarities with one cable and no servo motor. Its voltage triggered. What you put above is correct. The receiver distinguishes between H and V polarity.

3. The reason why I am asking the above is because the instructions that came with the DSR-410 states you can use a LNB and make sure it is on vertical polarity when on W5. Are all the channels vertical?
no. They're on both but to get the "hit" from Skyvision or NPS you need to be on a a V channel

4. The Skyvison instructions also show a diagram of a C-band LNF(f) with a high frequency splitter and the passive side of the splitter goes to your analog or 4DTV receiver and the other goes to the DSR-410. If you are using your 4DTV and an LNB how does the DSR control the polarity if you are on a vertical channel and need to be on a horizontal channel on W5?
if you are using a LNB (as in point 1) you need to use the analog box to change to horizontal. The 4DTV's (920,922,905) have a servo motor on the back if you are doing it that way. If you have a LNBF the 410 can control it

5. Where do you get one of those splitters? Radio Shack does not have that type, at least my local does not. I would like to use that to hook up my Uniden so when I do move the dish monthly I can land back on W5.
my local Rat Shack has them...they just have to go up to 2200 mhz

6. Also in 2009, where there still be analog C-band such as the welcome page on W5 / tr 23?
the 2009 analog shutdown is for OTA TV channels only...so your local stations. Nothing to do with cable/satellite
 
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skitheberks

Thread Starter
SatelliteGuys Family
Mar 26, 2008
108
6
CT
Thanks for the answers. It cleared up the confusion.
 
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