Changing LNBs

[RimaNTSS]

Hi! Sometimes we need to receive signals from different satellites and also different frequencies, I mean C-band, Ku-band, Ka-band, Whatever-band. Each band asks for different LNB to be used, so, there are different ways how to handle this issue: Use different antennas, use multifeeded LNBs and whatever. Other way to tackle this would be use one (polar-mounted) antenna and have LNBs changed when needed. Something like: When you push the button on remote, than antenna goes to proper satellite and right LNB is put in antenna's focus. Like on this video
So, my question would be - How to make this happen? Any ideas?

 

[Magic Static]

Some Ku motors can use DiSEqC 1.0 addressing. Move the dish with DiSEqC 1.2/ usals motor and rotate the LNBFs with the DiSEqC 1.0 motor. If I understand your question

 

[FaT Air]

Pretty sweet. Now, "How did you do it?"

 

[KE4EST]

I wanna try this!
I saw a video awhile back like this also.

 

[RimaNTSS]

"How did you do it?"

Well.... it is still in process. Simple- made a drawing , cut some metal, welded everything together, angle-grinded. And repeated process several times till satisfied with the result. Trial and error method, you know.

 

[pacificrim]

It is cool but am unsure of why it is useful. Multiple LNB setup - with C, Ku linear, and Ku circular - on a H2H motor is easier and more practical.
I wouldn't get in the way of a fun project with a good use of power tools though.

 

[RimaNTSS]

Multiple LNB setup - with C, Ku linear, and Ku circular - on a H2H motor

Do you mean that all those 4 LNBs are in antenna's focus? Or they are multifeeded? Of course that is easier way, but, unfortunately, with this setup you will never get maximum performance in all bands.

 

[pacificrim]

I respectfully disagree - at least on my 1.2 - I had a STAB120 motor moving the 1.2 with a Ku PLL in the center and 2 sidecars - 1 Titanium Cband PLL with scalar and a generic circular Ku. I got everything on Ku - including the hardest to get like FSTV on 123 in any weather and my CBand was very,very good. There was virtually nothing ITC on circular Ku, but it was there for when something appeared. The key is always to have a perfectly pointed, level, plumb, straight dish. Also - use a good sat meter not a STB at the dish to peak.
They were about 4 degrees apart and never had a problem. I think it would be fun to make a revolver for LNBs but I doubt my reception would be any better.

 

[RimaNTSS]

Reception on central (that one which is in focus) is always better tan reception from multifeeded LNB, that is axiom. Also means that central LNB will always give better rain margin and stronger signal at all times. Multifeeds are for amateurs and people who like their SAT systems installed and never touch again, they just watch TV.

 

[pacificrim]

Exactly, so put your sensitive Ku in the center and the others to each side and away you go. Cband is very well suited as a sidecar as is circular Ku.

 

[RimaNTSS]

C-band LNB placed in antenna's Focal point will bring better results anyway, and that why LNB-changer is needed.

 

[pacificrim]

What channels are you missing with your current setup?

 

[RimaNTSS]

I do not know, I do not watch TV. OK, sometimes I watch couple of channels, just to be updated what is happening.

 

[. Raine]

Someone had posted a setup they had like you're asking about a while ago, I'll try to find it but I don't remember what thread it was in.

 

[Titanium]

I am drawing a blank on the post as well, but it was by one of the SatelliteGuys UK members. The project was very well implemented and rapidly moved between the various feeds.

 

[RimaNTSS]

I know what are you speaking about... user's name is Trust and I got lots of ideas from him, I even visit him from time to time and get lots of help, theoretically and practically.

 

[. Raine]

I know what are you speaking about... user's name is Trust and I got lots of ideas from him, I even visit him from time to time and get lots of help, theoretically and practically.

That stirred the memory, it was Trust. Here's the thread.

http://www.satelliteguys.us/xen/thr...to-fix-drifting-ku.351585/page-3#post-3728689

 

[(((Garyd)))]

Exactly, so put your sensitive Ku in the center and the others to each side and away you go. Cband is very well suited as a sidecar as is circular Ku.

If you want noise, dead center to reduce noise, and at the right focal point

 

[pacificrim]

Its a cool project for sure. There are some different pics here: http://www.satelliteguys.us/xen/threads/dmx741-c-ku-lnb-mod-to-fix-drifting-ku.351585/page-3

 

[RimaNTSS]

Making another LNB changer. It is still on the table, but already works. Smaller motor this time and it turns fast. 360* in approximately 14 seconds. And a small movie