LNB - Techwatch Support Forums: Digital & Satellite TV, FTA, Cable, Computers, Mobile Phones, Apple and General Tech Forums

shikki · 25-07-06, 07:05 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, 09:23 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, 06:08 PM

Thank you very much for the support.

BGonaSTICK · 26-07-06, 06:16 PM

Glad to help

satsid · 26-07-06, 10:34 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, 07:53 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, 08:19 PM

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

25-07-06, 07:05 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, 09:23 PM	#2 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 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, 06:08 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, 06:16 PM	#4 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 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, 10:34 PM	#5 (permalink)
satsid Feedhunter Join Date: May 2006 Posts: 1,814 Thanks: 31 Thanked 86 Times in 62 Posts	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

30-07-06, 07:53 PM	#6 (permalink)
Analoguesat manic midlander retired mod Join Date: Jan 2006 Location: Scottish Borders Posts: 11,668 Thanks: 21 Thanked 1,339 Times in 990 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) __________________ Basic forum rules for both satellite & cable: no keys no patches no offering or asking for card shares Anyone pm'ing me for details of card sharing or anything to do with hacking cable will be banned immediately Analogue forever!!

30-07-06, 08:19 PM	#7 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 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