Norsat KU PLL Gain 55 dB and vs a normal PLL KU LNBF?

[john_robot]

Hi, Do you see any noticeable gain difference with very low signals?. I like to compare high quality LNB like Norsat PLL vs Geosat PLL KU LNBF.

Like to hear your experience and technical side too. I'm especially concerned about very low signal stability.

 

[Magic Static]

What size and shape dish? The GeoSat has a built in feed horn for offset Ku dishes. The Norsat will need a proper feed horn for the type dish it is mounted to.

 

[john_robot]

Its for 10ft prime focus dish. Lets assume we have proper feedhorn for Norsat.

 

[Titanium]

The KU LNBF's scalar is designed to match an offset .5-.6 fd type reflector and would not properly illuminate a 10' prime focus type with a low fd ratio.

 

[john_robot]

Ok lets say we modified the KU lnbf by cutting the neck and fix a proper C band scalar ring. Because my brief testing i found cheap LNBF performs better than expensive Norsat. How is that possible ?

 

[Magic Static]

Ok lets say we modified the KU lnbf by cutting the neck and fix a proper C band scalar ring. Because my brief testing i found cheap LNBF performs better than expensive Norsat. How is that possible ?

I have been in this same situation and asked the same question. Short answer; it's possible because there is a lot more science to capturing a satellite signal than most people are aware of. Further testing found my initial results an unreliable indicator of overall performance.

I use two ten foot C-Band dishes for both C/Ku. Both have a BullsEye II dual ortho feed horn. One has expensive Norsat PLL LNBs and the other has less expensive Norsat DRO LNBS, the DROs seem to work better on KU in this case. But there is no real discernible difference for the money.