Norsat .7dB Ku-band 2707A

[bloomdog]

Any comments on this lnb for fta?
Thanx

 

[Tron]

Any comments on this lnb for fta?
Thanx

Slightly better L.O. stability than the stock LNBs we usually use (+/- 750khz vs +/- 1mhz), but higher noise factor as well. Should work adequately...

http://www.skyvision.com/store/mi5002707.html

 

[GrumpyGuy]

The lack of voltage controlled polarity switching limits the practical application of these LNBs to one satellite-one polarity installations.

 

[ftarock]

this is a lnb, not lnbf. Lnb is designed to be use with feedhorn.
Not a limits, just want to clarify this.

The lack of voltage controlled polarity switching limits the practical application of these LNBs to one satellite-one polarity installations.

 

[bloomdog]

Can you please explain what you mean by:
"The lack of voltage controlled polarity switching limits the practical application of these LNBs to one satellite-one polarity installations."?????

 

[gabshere]

unlike the newer lnb's and they should actually be called lnbf's
this lnb is usually made to pick up only h or v and a polorotor changes the polarity..... so add it to a feedhorn and the motor switches the polarity

the newer lnbfs allow voltage switching usually via coax this one doesn't

 

[GrumpyGuy]

FTA receivers intended for the consumer market are designed to work with LNBs which automatically switch between horizontal and vertical polarity signals. This switching is controlled by the level of DC voltage the receiver uses to power the LNB, which varies between 13 and 18 volts.

This Norsat LNB is primarily intended for commercial applications that are dedicated to a single signal satellite and polarity. In these installations polarity adjustment is accomplished by the installer rotating the entire LNB and clamping it down in the LNB holder.

 

[bloomdog]

I thought that that is what you meant--but when I use the lnb, I get H and V channels without touching/rotating the lnb--it's alligned up & down, with no skew. Can you explain this?????
Thanks!

 

[GrumpyGuy]

An LNB can see some amount of signal from transponders of both opposing polarities, even without any change in the LNB's polarity adjustment. Attenuation of adjacent signals by polarization can be very effective, but is always less than absolute. The greater the strength of the incoming signals, the more this becomes evident.

If the LNB is aligned to a polarity position between what would be optimal for one polarity or the other, the difference between the signals is diminished.

If you try rotating the Norsat for optimal performance on one polarity. You should see a very noticeable degradation in performance on transponders of the opposite polarity.

 

[bloomdog]

Fascinating! Thanks for the info. This place is GREAT!