# What is the difference between L / R and Horizontal / Vertical Polarities ?

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##### SatelliteGuys Family
Original poster
Hi . ppl regarding the above subject please clarify the differences in the polarities when comes to C-Band frequencies and Ku-Band frequencies . They use Vertical polarity ( V ) and Horizontal polarity ( H ) for Ku-Band frequencies While They use ( R ) polarity or ( L ) polarity for C-Band frequencies My question here what R or L stand for ? According to my humbled experice R stand for Right which means Vertiacl while L stand for Horizontal does that correct , If not Please Advice .

Best Regards

C-band and KU-band may be transmitted with either polarization type. C and KU may be Linear (H=Horizontal / V=Vertical) or Circular (R=Right / L=Left). The broadcaster and/or the satellite design will determine if a signal is Linear or Circular.

Check with either "The List" or www.Lyngsat.com to determine what polarity type is used by the satellite you wish to receive and be sure to use and LNBF polarity type that matches the polarity designation. Failure to match polarity types will result in a signal attenuation of approximately 3dB and the receiver double scanning found frequencies as both horizontal and vertical. While the duplicate horizontal / vertical scans are irritating, the 3dB signal loss often results in channels being to weak to be received or reliably viewed.

An easy way to remember the correct voltage that a STB will output to an LNBF to switch polarities is "RV". To select Right Circular polarity it is the same voltage or polarity selection as Vertical. RV = 13vdc (typical).

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Two kinds of transmissions. Linear ~ Horizontal and Vertical Circular ~ Left and Right. These are received with LNBs designed for either Linear or Circular reception. Usually not both, but some LNBs can be easily modified from Linear to Circular by placing a Dielectric plate in the feed throat. Some frequency lists will indicate V for R and H for L frequencies to make it confusing some times.

I'm definately the slower typist here LOL

Thanks SatelliteAV for your respond and help

C-band and KU-band may be transmitted with either polarization type. C and KU may be Linear (H=Horizontal / V=Vertical) or Circular (R=Right / L=Left). The broadcaster and/or the satellite design will determine if a signal is Linear or Circular.

As you mentioned Linear and Circular polarization - Read This below and explain these six polarities

1- Right Circular Freqencies
2- Left Circular Frequencies
3- ( R ) Frequencies
4- ( L ) Frequencies
5- Horizontal Frequencies
6- Vertical Frequencies

All these six polarites are founded in Arabsat -2A during the Analog Transmission at the end of 2000 ( 22-7-2000 )
Now Analog Transmission has stopped .And This leads to another question What is the Difference between these polarities

Right Circular / Left Circular and R /L all these Circular Polarites

Best Regards

madhi: There are only 4 polarities total. You're just reporting different ways of writing the two circular polarities.

1=3; 2=4 in your post. There are only 4 polarities available: Two Circular polarities which are Left and Right. And Two linear polarities which are Vertical and Horizontal. Linear LNBF's can receive circular polarities with the use of a properly installed dielectric plate. The Right circular polarity will be received when Vertical is selected by the receiver. (RV) Left circular will be received when Horizontal is selected by the receiver. This assumes the LNBF is properly installed for linear polarity.
Adjacent satellites will usually have the opposite polarity for the same frequency to minimize interference. 3800Mhz @ 45° =V (or R) while 3800Mhz @ 47°or 43°= H (or L)

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