LNB - Techwatch: Satellite TV forums, FTA, Cable, Hardware, & Tech forums

shikki · 25-07-06, 08:05 PM

What is L and R Polarity? ( Right and Left ) Is it same as V and H? I have an LNB of V and H, Do I have to buy a new LNB to view L and R polarity? Please help me.

BGonaSTICK · 25-07-06, 10:23 PM

'Left' and 'right' handed circular polarisation is completely different to Horizontal and vertical polarisation I'm afraid, and yes, you will need a different LNB.

Circular polarisation is quite clever, whereby the signal is modulated onto a spiral shaped carrier, which is either left-handed or right-handed like a screw thread. There is very little circular polarisation used in Europe, but plenty in the US.

You can read a long-winded and frankly pretty boring description at Wikipedia, but it has a nice picture of a spiral: http://en.wikipedia.org/wiki/Circular_polarization

Hope this helps.

STICK

shikki · 26-07-06, 07:08 PM

Thank you very much for the support.

BGonaSTICK · 26-07-06, 07:16 PM

Glad to help

satsid · 26-07-06, 11:34 PM

hi m8 just to add 'Left' and 'right' as a rule is used for c-band & very big dishes.
all the best.
from.
sid

Analoguesat · 30-07-06, 08:53 PM

Circular polarization used to be used in Europe, (The two BSB satellites used RHC) but it died a death with the end of the early DTH broadcasting systems in the mid 1990's (BSB 1 & 2, Olympus 1 etc)

BGonaSTICK · 30-07-06, 09:19 PM

DISH use a lot of circular on Ku band too, like 129W and 148W for example.

25-07-06, 08:05 PM	#1 (permalink)
shikki Junior Member Join Date: Jul 2006 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	LNB What is L and R Polarity? ( Right and Left ) Is it same as V and H? I have an LNB of V and H, Do I have to buy a new LNB to view L and R polarity? Please help me.

25-07-06, 10:23 PM	#2 (permalink)
BGonaSTICK Super Murderator Join Date: Nov 2005 Location: Brighton Posts: 10,631 Thanks: 3 Thanked 62 Times in 36 Posts	Re: LNB 'Left' and 'right' handed circular polarisation is completely different to Horizontal and vertical polarisation I'm afraid, and yes, you will need a different LNB. Circular polarisation is quite clever, whereby the signal is modulated onto a spiral shaped carrier, which is either left-handed or right-handed like a screw thread. There is very little circular polarisation used in Europe, but plenty in the US. You can read a long-winded and frankly pretty boring description at Wikipedia, but it has a nice picture of a spiral: http://en.wikipedia.org/wiki/Circular_polarization Hope this helps. STICK __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W

26-07-06, 07:08 PM	#3 (permalink)
shikki Junior Member Join Date: Jul 2006 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Re: LNB Thank you very much for the support.

26-07-06, 07:16 PM	#4 (permalink)
BGonaSTICK Super Murderator Join Date: Nov 2005 Location: Brighton Posts: 10,631 Thanks: 3 Thanked 62 Times in 36 Posts	Re: LNB Glad to help __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W

26-07-06, 11:34 PM	#5 (permalink)
satsid Senior Member Join Date: May 2006 Posts: 1,678 Thanks: 0 Thanked 1 Time in 1 Post	Re: LNB hi m8 just to add 'Left' and 'right' as a rule is used for c-band & very big dishes. all the best. from. sid


Technology Forums: FTA, Satellite, Cable, Home Media, Hardware & Computers \| Home \| Forums \| News \| Blog \|

30-07-06, 08:53 PM	#6 (permalink)
Analoguesat Satellite mod Join Date: Jan 2006 Location: Scottish Borders Posts: 8,135 Thanks: 8 Thanked 243 Times in 225 Posts	Re: LNB Circular polarization used to be used in Europe, (The two BSB satellites used RHC) but it died a death with the end of the early DTH broadcasting systems in the mid 1990's (BSB 1 & 2, Olympus 1 etc) __________________ Dreambox 7020 / Pace Sky Digibox / Amstrad Sky Italia box 5 dishes for 5E/9E/13E/16E/19E/23E/28E Please DO NOT pm the mods & admins for c&ble keys. You may get banned for it! Read the rules before you post - click here to read them

30-07-06, 09:19 PM	#7 (permalink)
BGonaSTICK Super Murderator Join Date: Nov 2005 Location: Brighton Posts: 10,631 Thanks: 3 Thanked 62 Times in 36 Posts	Re: LNB DISH use a lot of circular on Ku band too, like 129W and 148W for example. __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W