Ethio Dish LAB Member
Posts : 46 Points : 143 Reputation : 23 Join date : 2014-11-19
| Subject: [Exclusive] የትኛውም LNB ነው ምርጥ 17 K, 15 K, 13 K Thu Sep 08, 2016 1:46 am | |
| You see on the LNB top , N.F. reading is given there. The Noise Figures (N.F) refers the quality of the first stage input amplifier transistor. The quality is measured in units called Noise Temperature, Noise Figure or Noise Factor. Both Noise Figure and Noise Factor may be converted into Noise Temperature. The lowest Noise Temperature is better. So an LNB with Noise Temperature = 13 K is as good as one with 17 K. (K means degrees Kelvin) So the noise figure refers “ HOW MUCH NOISES ARE MIXED WITH SIGNAL”. So in practical, 17 K - Normal 15 K – Better 13 K - Best. Advantages of 13 K LNB . 1. Noises are reduced. 2. Picture freezing can be avoided. 3. Useful for low signal / out of coverage satellites. But cost wise 13 K LNB is higher than the other LNB. | |
|