Thread: Three LNBs C-band/Ku/DBS... No problem

Now this is a creative way of making it happen with three LNB's and a big ole scalar ring...

I saw that yesterday and was thinking that it'd be easily re-creatable.

It looks almost like hot-glue was used to secure the DSS LNB to the C-band one.

A setup like this is why I was trying to understand how a scaler ring works. I understand what it does.... I want to know how it does. If the rings are insignificant other than for stiffening purposes it's all good. If they actually do something than a couple feedhorns poking through will probably wreak havoc.

That was my thoughts exactly... BUT

The scalar ring is designed to block interference from other sources. If this holds true, theorectically the other LNBs would not help or hurt the rings ability to block noise or so one would believe.

Looking at the positioning of the Ku LNB feedhorn to the waveguide opening for the C-band... I know my Ku LNB wouldn't put up with that. It's too close and forward of the opening.

It may not be a factor for the c-band wavelength though.

Shawn

Originally Posted by questic

Now this is a creative way of making it happen with three LNB's and a big ole scalar ring...

I've been doing this with 4 lnbs on a 10 ft system for some time now.


http://community.webshots.com/album/100919814SUmqRr

Wow!!!!
What a setup, man! You are my hero!

Do you mind me asking what are you using the elvevation servo for? I'd also be interested if you post some comparison between you feedhord-mounted Ku LNB vs. the Invacom.

Great job!

Originally Posted by zodiak

Wow!!!!
What a setup, man! You are my hero!

Do you mind me asking what are you using the elvevation servo for? I'd also be interested if you post some comparison between you feedhord-mounted Ku LNB vs. the Invacom.

Great job!

elevation servo? I'm not sure which part you are referring to there. ?

The quality readings between the Norsat ku lnb and the Invacom lnbf are actually about the same, even though the Invacom is at about a 2 degree offset from the central feed throat. I mainly use the Invacom for the atlantic region where the 'low-band' ku signals reside.

Originally Posted by spyder

elevation servo? I'm not sure which part you are referring to there. ?

Well, this question is not directly related to this thread. I'm talking about
this photo

.

Originally Posted by spyder

The quality readings between the Norsat ku lnb and the Invacom lnbf are actually about the same, even though the Invacom is at about a 2 degree offset from the central feed throat.

I assume you use adjusted angles when you position your dish, right?

Originally Posted by zodiak

Well, this question is not directly related to this thread. I'm talking about
this photo

.


I assume you use adjusted angles when you position your dish, right?

Oh , that's the gear/chain drive for the horizon to horizon mount. That simply moves east/west along the arc. All the elevations/declinations are preset in the dish mounts and hrdware.


Yes, when tuning in a signal with the Invacom I need to track about 2 degree west of the actual satellite location to get the proper bounce angle. Same goes for the dss lnb exept to the eastern side.