Dual C-Band LNB question

[Greg Mueller]

On a feedhorn like the ADL-RP1
ADL C-Band Linear RP1 Feeds
How would you wire the LNBs together to feed to the receiver?
Some kind of switch I presume.

 

[sergei]

Just run two cables to the dish, that's what I did on my Chaparral Dual Feed feedhorn.

 

[Anole]

FAQ:

See this post in the Switches Simplified FAQ, and look under:
- Special Case: old Primestar LNB
It applied directly to your two-LNB question, when used with modern FTA receivers, using voltage-controlled LNBs.

There has also been some discussion about the fact that one of the LNBs gets 18 volts, and the other only about 12 volts.
Some LNBs don't like the lower voltage.
And two solutions discussed (in other threads) include Power Inserters, or a modification to the MultiSwitch.

 

[Greg Mueller]

Thanks
A particular brand to recommend?

Would something like a DP34 switch work?

 

[Greg Mueller]

Just run two cables to the dish, that's what I did on my Chaparral Dual Feed feedhorn.

But what did you do when they got to the receiver? There's only one input on mine.


I was kind of hoping there was a way to hook both of them up at once so no switching was involved.

 

[truckracer]

i have dual c and dual ku lnbs on my dish. my vertical lnbs only get 13v and work fine. my horizontal lnbs get the full 18v and work fine. I use powered multiswitches two of them.
one 4x2 for c band and one 4x2 for ku.

c band only would only require one multiswitch. I recommend a powered one out next to the dish to minimize the power loss from longer coax runs as far as the 13v lnb is concerned.

 

[sergei]

What type receiver are you using, is it a 4DTV, FTA or both?

 

[Greg Mueller]

I have a 922, but not sure I will use it. I want to get a PCI card for the computer. I think the Technotrend at this point but, that is still up in the air.

Do they make a C-band LNB that has the switch built in? One simple package? Or do you loose efficiency when you do it that way?

 

[voomvoom]

I have a Chaparral Dual C-Band feedhorn. I use 2 @ 1x2 HF splitters (one port power pass) and the power pass port goes to a 4dtv, while the other port goes to a 4x4 multi-switch to V/H respectively. The lnb's get there power from the 4dtv and both get 18 volts. The 4x4 switch feeds 4 DVB receivers.

This way I have 4 cables, 2 for the 4dtv and 2 for my DVB system

 

[Greg Mueller]

This one
17K B1 SAT Stack C-Band LNBF
seems to have the switch built in.

Anyone using one of these?
How's it work?

 

[truckracer]

the signal stacked lnbf will not work with the dsr-922 because the IF frequency is different.
Most fta receivers can use it however.

I use a dsr-905 4dtv set to "dual c and dual ku lnbfs" in the antenna menu.
My chaparall orthomode dual c dual ku feedhorn (has two c lnbs and two ku lnbs) works like an lnbf but with a bit better performance imo.

My c-band lnbs are dms bsc211's. they work fine at 13v. I have fed them 18v before and cannot tell any signal quality increase at all.

My switches are in a plastic nema enclosure on the mounting pole at the dish to minimize the vertical's 13v low voltage losses.

I feed a 4dtv, pansat 9200HD, fortec ultra lifetime, old ariza fta box that i use to get equity channels from 123w ku. My 9200's new firmware from pansat does not allow equity's audio and video pids to scan in correctly making it impossible to receive some of the channels.
something screwy in the placement of the pids to show the video.

 

[Greg Mueller]

I'm really wondering if I need the 922 if I don't plan to subscribe to anything.
Seems like a pci card would have a few advantages over the 922 versatility wise