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Group Buy Of Norsat 8000RI Extended C Band LNB

Discussion in 'DISH SETUP: Single sat, Multi-Sat & Motorised' started by moonbase, Feb 16, 2017.

  1. Feedsat_DXer

    Feedsat_DXer Specialist Contributor

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    From my point of view and my "small " experience, if your dishes are smaller than 1.80m, it s better to forget about cband extencted experience; especially for tv programms like at 40.5°W or 65°W.

    There is a big step between "find a frequency " and "lock a frequency" if you see what I mean...
     
    otokoc, nelson_b, scopus and 4 others like this.
  2. hvdh

    hvdh Specialist Contributor

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    Regretfully, both the 3.4...3.7 and 4.5...4.8 GHz ranges are frequently referred to as "extended C-band".
    I don't think there is a consistent or official (ITU?) naming for these bands.
    For 4.5...4.8 GHz, I read "Super-Extended C-band" here for the first time. "INSAT" I've read before, but isn't so great because other operators use the band as well.
     
    Feedsat_DXer likes this.
  3. Channel Hopper

    Channel Hopper Suffering fools just so you don't have to Staff Member

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    The Norsat LNB is not built/specified to reach frequencies below 3.625 GHz , thereby missing out on the lower frequencies that are 'relatively' common. Moonbase has posted the original technical detail fo the device that confirms the LNB has a local oscillator set to 5.75 GHz which goes halfway to how the LNB will perform. Unfortunately the mechanical design of the feed connection is standardised at the 5.150 L.O. with a CPR/WR 229 flange, which is rated for 3.4 - 4.2, but so far I cannot see a performance curve that provides confirmation the upper frequencies are not affected.

    Nevertheless, the LNB does have to bolt onto a dish feed and/or corotor/BullsEye type combiner so a compromise had to be made.

    Perhaps some enterprising individual will make a bespoke feed tuned throughout the extended/super extended/Carlos Fandango range at a later date.
     
  4. s-band

    s-band Regular Member

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    L Band & S Band 0.3dB NF LNA/C, Tit C Band or Band C ka occasionally fitted. 1.8m CM - work in progress
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    Why? ........

    For
    Covers 4.5-4.8G as well as the “normal” band
    WR229 flange - chose your own feed
    35K probably means 35K with Norsat
    May cover down to 3.4GHz with TBS6983 etc (subject to verification)
    The best 4.5-4.8 LNBs are very limited in use, this is a compromise

    Against
    35K may mean it’s a dB or 2 worse than the best pro LNBs
    DRO, not PLL
    WR229 - needs a feed which should be wide band
    Single polarity - need 2 for OMT or polar rotor
    Not much to receive, no TV on small dishes in Europe.
    Expensive

    Why am I getting one?
    Curiosity
    The modified Tit wasn’t good at 4.8G
    It’s WR229 so works with a straight through feed and others
    TBS6983/6903 cards cover up to 2350MHz allowing use to 3.4GHz
    If it is OK and works <3.6G, I might modify it to PLL or use it as a wide band LNA (once I’ve finished the big dish mount and done dozens of other things)
     
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  5. Channel Hopper

    Channel Hopper Suffering fools just so you don't have to Staff Member

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    In the same manner as upper Ku band, where the higher (Telecom) frequencies were better received once the dish manufacturers had made adjustments to their feedhorns and transfers (resulting in a slightly smaller diameter).

    The CPR229 specification is now commonplace but historically is derived from an earlier WG11 specification from the beginnings of GHz reception with dimensions of approximately 29 x 58mm. There is another port for this band however, mechanically smaller, WR187 which has dimensions of 22 x 47mm (again approx) and the centre frequency is better aligned with requirement of a super-duper wideband LNB.

    I would hazard a guess the latter might perform better at the upper 4.5-4.8GHz wavelengths.
     
  6. moonbase

    moonbase Regular Member

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    Unfortunately we did not get the required number of orders to fulfill the minimum order requirement. This group buy should now be considered closed.
    Thanks to forum members John and s-band for expressing interest in the group buy, also thanks go to other forum members for their technical input on the topic.

    Rgds
     
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  7. satosk

    satosk Member

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    4.5-4.8 GHz has always been referred to as "Insat C band" as Insat was probably the first satellite operator that openly provided service in this band. I personaly bought a Norsat 8115I back in 2011 and it took more than 3 years when the first picture appeared on the TV screen and believe me or not, $120 was not even the half of the price I paid.
    DXtv.de | C-Band Empfang | Extended C band (4.5-4.8 GHz)
    Extended C band (4.5-4.8 GHz) : Pasmo-C - Forum TV-SAT
    Anyway, 35K (or typical 20K) is nothing for small dishes. I`d like to point out to the fact, that it was the Superior Satellite company that announced this LNB as the first one...and then, because of the cooperation with Norsat, Norsat started offering their Norsat 8000RI.
    http://superiorsatelliteusa.com/pdf/8000RI-LNB.pdf

    Later more companies started selling similar product even I think it is the same lnb with different stickers. http://www.images.com.br/wp-content/uploads/2016/08/LNB_Banda-larga_800RI_rev_A.pdf

    Also, there is a reason why Superior Satellites recommends to use this LNB on "bigger" dishes - 3.7m +.
    Modified Frequencies C-Band – SSE
    Those of us who have some experience with different LNBs know why....

    By the way, only fools wait until orbit is full of signals and satellite equipment is as cheap as chips! You have no idea how much fun and joy you miss guys!
    Everybody fishes in the same river of Ku band....a small group of people is not afraid to go and fish in the lake of C band...those few of us try their luck in the sea of Ka or Extended C band...but only 3 as far as I know dare to conquir the almighty ocean of X band!
    We are there `cause we dare, not because we can afford that!
     
    Last edited: Feb 20, 2017 at 11:55 PM
    Trust1, s-band, Lazarus and 1 other person like this.
  8. John

    John Enthusiast.

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    My Satellite Setup:
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    Ku - Ka -C & Ext C.
    PC cards-TM5402 receivers.
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    Well said.
     

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