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

slushpump · 30-05-06, 04:40 PM

LNBs carry a db value - e.g. 0.3db. What does this refer to - do you look for the lowest figure, as they seem to vary between 0.2 and 0.6.

BGonaSTICK · 30-05-06, 08:00 PM

Yes, that's the noise figure. It should be as low as possible, but 0.6dB or lower is good.

I'm not an expert, but apparently it's impossible to actually achieve a 0.2dB noise figure outside of the laboratory, and many LNB manufacturers are notoriously optimistic when it comes to quoting noise figures.

There is actually really nothing to choose between a 0.3dB and a 0.6dB LNB in terms of noise.

Analoguesat · 07-06-06, 06:32 PM

If you are going to be viewing straong signals, then any old universal lnb with a noise value of 0.8dB is going to be fine. You only really need the low noise stuff if you are looking to wring every morsel of a signal out of a dash - if you were an expat desperate for Astra 2D in Spain for instance

30-05-06, 04:40 PM	#1 (permalink)
slushpump Junior Member Join Date: Apr 2006 Posts: 19 Thanks: 0 Thanked 1 Time in 1 Post	Decibel values LNBs carry a db value - e.g. 0.3db. What does this refer to - do you look for the lowest figure, as they seem to vary between 0.2 and 0.6.

30-05-06, 08:00 PM	#2 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 Posts	Re: Decibel values Yes, that's the noise figure. It should be as low as possible, but 0.6dB or lower is good. I'm not an expert, but apparently it's impossible to actually achieve a 0.2dB noise figure outside of the laboratory, and many LNB manufacturers are notoriously optimistic when it comes to quoting noise figures. There is actually really nothing to choose between a 0.3dB and a 0.6dB LNB in terms of noise. __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W

07-06-06, 06:32 PM	#3 (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: Decibel values If you are going to be viewing straong signals, then any old universal lnb with a noise value of 0.8dB is going to be fine. You only really need the low noise stuff if you are looking to wring every morsel of a signal out of a dash - if you were an expat desperate for Astra 2D in Spain for instance __________________ 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!!