Dual C-Band feed Configuration

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oncewaslost

oncewaslost

Thread Starter
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Feb 5, 2007
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I was thinking about buying one of these dual c-band lnbf's
http://www.adventistsat.com/shop/item/LN-GEO+C2
and using a 2X4 multi switch to distribute.
However, my C-Band Legacy receiver (AKA Drake 1524) does not support LNBF. I want to feed an fta receiver and a DVB card in addition to the c-band receiver.
My dish is 140ft away. Attached is one configuration that I thought of, I am not sure if it will work with the splitters.
What do you all think?
 

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Mr Tony

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Nov 17, 2003
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actually you might need both sides to pass voltage and make sure ot match them up right (H on the analog matches 18v on the multiswitch)

Yes it will work. I have 5 recievers running off mine using 2 splitters and a 3x4 multiswitch
 
oncewaslost

oncewaslost

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Feb 5, 2007
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Iceburg

I found an old thread where you were setting yours up. Are you still using the dual feed with LNB's, or are you using LNBF's now?
 
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Mr Tony

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both

for 99 (G4/G16) I use the dual LNBF (as noted above) and for 103 I have an old LNB that I have to manually skew the little "notch" inside the LNB to get it to skew (the polorotor box busted off recently)
 
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Mr Tony

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Here is an older picture. I dont have the new one up with the "old" LNB to the right for 103 ;)
 

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oncewaslost

oncewaslost

Thread Starter
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Feb 5, 2007
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actually you might need both sides to pass voltage and make sure ot match them up right (H on the analog matches 18v on the multiswitch)

I see now how I could have a problem with the c-band receiver if no other device is tuned to the same polarity, nothing would power the LNBF.

Letting both pass voltage is a scary thought. They always made a big deal about using the blocked splitter when splitting a c-band feed to an FTA box.

What happens with the voltage in a multiswitch? Is the voltage from multiple units applying power to the LNBF?
 
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Mr Tony

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Nov 17, 2003
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Letting both pass voltage is a scary thought. They always made a big deal about using the blocked splitter when splitting a c-band feed to an FTA box.
correct. But in this case both units need to have power sent to the LNB. As long as the polarities are correct (ie: the cable from one output goes to the H side of the C-band box and to the 18v side of the multiswitch) you will be fine.

What happens with the voltage in a multiswitch? Is the voltage from multiple units applying power to the LNBF?

one reciever powers the multiswitch. When you select a H polarity, it sends 18volts to the multiswitch and up that line (18v on the multiswitch). If you select a V polarity, then it sends 13v to the switch
 
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Mr Tony

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Hey Ice what satellite's are you picking up with your dish with your 3 lnb's

its just 2 LNB's

the dual is on G4/G16 for the nets mainly and some HD
the single one is on AMC1. The signal is low but stable.
 
oncewaslost

oncewaslost

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Feb 5, 2007
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Iceberg,

What has me confused, is that my c-band receiver only sends out about 16.5V (no LNBF support). I assume that 16.5V will force the LNBF to H, so for the LNBF designated as H, splitting will work OK . Now I can't pass that 16.5V to the LNBF that is designated for V, or it will force it to H. But If I don't pass any voltage to it (using a splitter with c-band side voltage blocked) then the c-band receiver will not be able to tune V unless another device is tuned to V and powering the LNBF.

See, I am confused:confused:
 
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Mr Tony

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Nov 17, 2003
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interesting

I know when I hook the line diretcly to my HTS Tracker IV it is only H polarity too. I dont have separate H & V inputs. I thought you did on your box?
 
oncewaslost

oncewaslost

Thread Starter
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Feb 5, 2007
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I have two separate inputs that can be configured with one as C and the other as KU, OR they can be configured as dual C. This is selectable from the setup menu. However, 16.5V is what comes out to power an LNB either way.
 
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Mr Tony

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uh oh...not good. I figured the receiver could control it
 
oncewaslost

oncewaslost

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Feb 5, 2007
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OK

Back to the drawing board.
 
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vittles69

Active SatelliteGuys Member
Jul 6, 2005
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Hi Iceberg,

I just got my Fortec 6 foot prime focus dish setup with an actuator and G4 @99 degrees is the last sat I can see due to a fence restriction. Just wondering if you can provide some info regarding which transponders on AMC1 Cband you can lock and watch with your second LNBF. I am thinking of maybe trying this?
 
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Mr Tony

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Nov 17, 2003
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I can lock on all of them (digital) that are DVB (I dont have a 4DTV)

Pax (3840 H ) & TLN (4005 H) jump between 30-45 on the Pansat which is stable enough
The other religious channel (CTN) (3984 H) is higher (50 or so)
NY Legislature fluxuates greatly. MOst of the time I can lock on it but sometimes its nothing.

The only thing I can't get is DWTV (3740 V) and thats because I have an old LNB that manually has to be skewed. Even if I get it, the high FEC (7/8) makes it unstable

http://www.lyngsat.com/amc1.html
 
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