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  1. #1
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    Default noutate in domeniul lnb-urilor

    am avut azi in mina o nouate, un lnb cu 2 iesiri.
    una dintre iesiri este deja banala si arhicunoscuta, se foloseste pentru un receiver.
    cealalta iesire constituie noutate absoluta. la aceasta iesire se pot lega in serie 4 receivere cu conditia sa se foloseasca doze. cele 4 receivere functioneaza absolut independent pe orce frecventa sau polaritate. pretul actual €100.
    spor la cumparaturi !

  2. #2
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  3. #3
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    Default

    nu, se pare ca nu ai fost atent. acest lnb are doua iesiri in timp ce unicable are doar una. dupa stiinta mea unicable functionau doar cu unele receivere ce aveau integrat un protocol de comunicare, din cite i-mi aduc aminte doar lemon avea asemenea receivere. cred ca acest tip de lnb a avut o viata scurta si un pret imens, undeva bine peste €100.
    aici e vorba de altceva, cu un lnb se pot folosi 5 receivere independent pe doua cabluri. unul separat si 4 legate impreuna neaparat prin doze.

  4. #4
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    Default

    este vorba de acest lnb


    sky it de exemplu il foloseste in "serie" pentru "mysky" pe un canal te uiti si pe altul inregistrezi


  5. #5
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    Default

    da, acesta este principiul. mai stiu ca cel pe care l-am vazut este produs de o firma belgiana.

  6. #6
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    Default

    Quote Originally Posted by costinitalia View Post
    este vorba de acest lnb


    sky it de exemplu il foloseste in "serie" pentru "mysky" pe un canal te uiti si pe altul inregistrezi
    Si de ce ar mai fi nevoie de doze intre receptoare ?sau e neaparata nevoie sa fie receptoare care sa aibe functia SCR? cum ar fi sa pozam totul si ce fel de doze exact ar trebui? spliterele alea mici cu 1 in si 2 out e ok?

  7. #7
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    Question

    la aceasta iesire se pot lega in serie 4 receivere cu conditia sa se foloseasca doze
    Grado, Shure, Audio Technica, Ortofon, Stanton sunt bune?
    Cred ca mai am niste relicve de doze.

    Am o intrebare?
    Cum comuta pe acelasi cablu, dintr-o singura iesire, fiecare receptor pus in serie, banda si polaritatea dorita diferite la momentul tz?
    E un quad digital + 1 ?
    Cat costa o doza?
    Cat un Grado?

    E vorba de un LNB care luvreaza in standard for distributing satellite signals over a single coaxial cable - CENELEC EN50494 - has been developed by a consortium led by SES Astra. ?

    Daca da, m-am lamurit.

    How it works

    Each satellite receiver in the installation has a dedicated user band of a bandwidth approximately the same as a transponder. The receiver requests a particular transponder frequency via a DiSEqC-compliant command. A mixer in the dish-end equipment (an LNB or distribution unit) converts the received signal to the correct user band IF centre frequency for that receiver.[2]

    The converted transponders of the various users are then combined, and sent via the single coaxial cable to the receivers. The combined signal is tapped or split to reach every user.
    [edit] Equipment

    Special LNBs have been developed for use in single cable distribution systems. All four sub-bands of the Ku band (low frequency/horizontal polarity, high frequency/horizontal polarity, low frequency/vertical polarity, high frequency/vertical polarity) are received by a conventional front end, amplified and downconverted to the L-band, to be fed to a number of Single Cable Router (SCR) chips – one for each user that can be connected - to further downconvert the required section of the received spectrum to centre on the user band IF frequency. The LNB further includes a mixer to combine the user bands together and a microcontroller to receive the instructions as to which frequency is required by each user and control the SCR chips. [3]

    Alternatively, a single cable distribution system can use a conventional LNB feeding the four sub-bands to a separate SCR device, as a substitute for a traditional multiswitch, that needs a dedicated coaxial cable for every receiver (or tuner) connected.

    Unicable LNBs and SCRs also include either a legacy mode of operation or a legacy output which provides conventional LNB IF for use with an installation of non-Unicable receivers.

    A receiver required to operate in a single cable distribution installation can be essentially conventional. It should be able to tune to the user channel (within the normal IF tuning range) and modulate the LNB power voltage with the 22 kHz signal required for issuing DiSEqC commands. It will then require only software modification to operate as a single cable distribution receiver.

    For correct operation, two-way splitters are required to feed the combined signal to each receiver. These allow bi-directional passage of both RF and DC signals, to provide for the passing of DiSEqC commands between the LNB and receiver(s).

    As of March 2010, SES Astra's Single Cable Distribution factsheet lists 88 receivers as supporting single cable distribution technology[4] although this list is not exhaustive. Several receivers for the HD+ German high definition platform broadcast from Astra 19.2°E are compatible with the SCR system.
    Nu mai veni cu bombe din astea ca-mi sare inima la tot ce este nou...si cere iar bani...

    Si inca o rugaminte.

    Pune materialele legate de LNB-uri la "OUTDOOR" nou infiintat si al dorinta matale!
    Si o ultima rugaminte.
    Incepe cu majuscula, am si eu un bazdac, tin la forma!

    Cве најбоље!

  8. #8
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    Default unicable

    Este un lnb unicable sau scr.Una din iesiri este clasica,cealalta este unicable la care frecventa intermediara a semnalului de iesire din lnb are in realitate 4 valori pe care decoderul care suporta acerst nou sistem reuseste sa le receptioneze ca si cum ar fi 4 lnb individuale independente.Asa este posibil ca 4 decodere unicable sa poata fi legate la un singur cablu de coborare folosind un simplu distribuitor satelitar 1+4.asteptam la digi un decoder cu aceste capacitati?

  9. #9
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    Default

    eu am inteles ca merge cu orce fel de receiver, nu doar cu cele unicable. sunt toate noile receivere echipate cu protocolul unicable ?

  10. #10
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    Default

    eu am inteles ca merge cu orce fel de receiver, nu dsoar cu cele unicable.
    Cum ?
    Poti sa explici?

  11. #11
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    eu sunt amator, expicatiile trebuie sa le dai tu ca profesionist.

  12. #12
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    Raspunsul e dat mai sus.
    A receiver required to operate in a single cable distribution installation can be essentially conventional. It should be able to tune to the user channel (within the normal IF tuning range) and modulate the LNB power voltage with the 22 kHz signal required for issuing DiSEqC commands. It will then require only software modification to operate as a single cable distribution receiver.

  13. #13
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    Default

    @costinitalia, la ce pret lai gasit ? ce denumire comerciala are ?

  14. #14
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  15. #15
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    Default

    Buna dimineata Florine.Vezi si aici:
    http://www.ewerk-onlineshop.de/sat-t...096e627e8a3163

    Bafta.

 

 

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