Output Voltage

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dbshelton

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SatelliteGuys Family
May 4, 2008
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Kountze,Texas
What should the output voltage to the LNB be on a C band receiver? My 4DTV and Toshiba 1420 both show 20 volts. Toshiba TRX80 shows 17.5 volts. What is the minimum to get a picture?
 

truckracer

SatelliteGuys Pro
Sep 17, 2004
4,338
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Charleston wv
That sounds about right, Depends on the lnb, but most are rated from 15 to 24 volts dc.
Your lnb should have the specs on the decal. If not do a google search and find the specs.

17 volts should be fine. PLL lnbs are the most sensitive to low voltage.
 

Mr Tony

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Nov 17, 2003
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Mankato, MN
veritcal polarity is around 13 volts and Horizontal is around 18 so try a vertical channel and see what you get for voltage
 

voomvoom

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May 18, 2004
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Lizella, Georgia Republic
On the lnb's with non-voltage type polarity (servo motors), it's like truckracer said 15-24 volts, I thought it was 17-24 volts, but his answer is close enough for me.
 

Anole

SatelliteGuys Master
Sep 22, 2005
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L.A., Calif.
sample

... most are rated from 15 to 24 volts dc.
I looked on the DMSI site and didn't find any specs on either their C nor Ku LNBs
I looked on the Sadoun site, and didn't find anything useful (to this discussion ;) )
Then, I took a look on a DMSI reseller, IvyStonePlace and found:

BSC211 C-band LNB:
DC SUPPLY +15~25 Volts at 150 mA
NOISE FIGURE 17° K ( MAX )
OPERATING TEMPERATURE -40° C ~ +60° C
R.F. FREQUENCY RANGE 3.4 to 4.2 GHz

That's only one data point and you shouldn't assume yours will work down to 15 volts, but if ya have something fairly new, it might.
So, I guess that leaves us performing a test on what we got, huh? :cool:
 

truckracer

SatelliteGuys Pro
Sep 17, 2004
4,338
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Charleston wv
I have tried my dms bsc 211 lnb on my chaparall feedhorn at 13v dc and it still works!
I am sure there are some losses but it still works.
 
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