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  Satellite Internet forum › iDirect Forum: hubs and terminals › Incompatible LNB in iDirect HUB
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Incompatible LNB in iDirect HUB

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was2006
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Posts: 24
Sep 9th, 2009 at 5:36am  
Hi,

At the moment we are using NJR2754HH DRO LNB with our remote satellite terminals. We have a plan on changing HUB service provider and new provider says that there is no option to assign my LNB type on his iDirect 5IF HUB chasis. Are there any compatible LNB types for that.

Pls. advice.

Regards,

Was
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Eric Johnston
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Reply #1 - Sep 9th, 2009 at 9:07am  
"Ku band" is rather wide, 10.7 - 12.75 GHz, and several different LNBs are needed, each covering a section of the band.

Each type has a different local oscillator frequency, used to downconvert the satellite frequency into the L band frequency within the cable to the modem.

10.95-11.7   LO=10 GHz       NJR2784  
11.7-12.2     LO=10.75 GHz  NJR2744
12.25-12.75 LO=11.3 GHz    NJR2754
...

More details about How LNBs work
More details of NJR LNBs

Ask your new service provider what type LNB is required to work with their service.  The type will depend on their outlink carrier frequency.

Your existing LNB NJR2754  is only suitable for downlink carriers in the range 12.25 - 12.75 GHz.

Best regards, Eric.
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Ex Member
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Reply #2 - Sep 9th, 2009 at 11:55am  
Quote:
Hi,

At the moment we are using NJR2754HH DRO LNB with our remote satellite terminals. We have a plan on changing HUB service provider and new provider says that there is no option to assign my LNB type on his iDirect 5IF HUB chasis. Are there any compatible LNB types for that.

Pls. advice.

Regards,

Was

Tell your hub operator to to build your LNB from scratch in the the LNB section of the Remote RFT in iBuilder.  Tell him to right click, and add a new LNB (with your specs).   He will need to know the stability of your LNB when he builds one.
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Agor
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Reply #3 - Sep 25th, 2009 at 12:04pm  
In addition to the frequency range issue, there is another factor to be considered:
If the forward carrier has low data rate, the remote IDU may not be able to lock on the carrier with DRO LNB . In this case PLL LNB is required.

BR,

AGOR
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Ex Member
Ex Member
Reply #4 - Sep 26th, 2009 at 2:14pm  
I will agree/concur with that.
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Email me: eric@satsig.net

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