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A Look at Which is Better: W-CCK as Wired Vs. 2way w/CCK

Discussion in 'DIRECTV Installation/MDU Discussion' started by dielray, May 29, 2012.

  1. dielray

    dielray Legend

    234
    1
    Aug 5, 2009
    The WiFi DECA(W-CCK) can be used as a wired bridge to the internet. That leaves the question of: When the wired internet connection is next to a receiver, is it better for the satellite power level to use a W-CCK inline or split the line with a 2way and use a CCK?

    To answer that I used the AIM to run a transponder survey. I used the same coax cables each time, and just replaced the piece connecting the two cables together. I ran the test using an F81, a 2way splitter, and a W-CCK. I ran the test on both SWM channel 1(normally just guide data) and channel 9. Here are my results(abbreviated to just the 99).

    Through F81 - Channel 1
    Code:
    Sat/Tr  Freq(MHz) Pwr(dBm) SNR(dB)  SQ Offset(MHz) Lock Volts(V) Cur(mA)  ODU SWiM
    99/1       274.00    -34.6    13.5  96       -1.07  YES      0.0       0  SL3    1  
    99/2       274.00    -34.6    13.6  96       -1.08  YES      0.0       0  SL3    1  
    99/3       314.00    -34.9    12.5  93       -1.08  YES      0.0       0  SL3    1  
    99/4       314.00    -35.2    12.6  94       -1.08  YES      0.0       0  SL3    1  
    99/5       354.00    -34.8    13.2  95       -1.08  YES      0.0       0  SL3    1  
    99/6       354.00    -34.7    13.2  95       -1.08  YES      0.0       0  SL3    1  
    99/7       394.00    -35.2    12.6  94       -1.08  YES      0.0       0  SL3    1  
    99/8       394.00    -35.1    12.5  93       -1.71  YES      0.0       0  SL3    1  
    99/9       434.00    -34.8    13.3  95       -1.08  YES      0.0       0  SL3    1  
    99/10      434.00    -34.6    13.3  95       -1.09  YES      0.0       0  SL3    1  
    99/11      474.00    -35.3    12.5  93       -1.09  YES      0.0       0  SL3    1  
    99/12      474.00    -35.4    12.4  92       -1.09  YES      0.0       0  SL3    1  
    99/13      514.00    -35.1    13.8  96       -1.09  YES      0.0       0  SL3    1  
    99/14      514.00    -36.0    13.5  96       -1.08  YES      0.0       0  SL3    1  
    

    Through W-CCK - Channel 1
    Code:
    Sat/Tr  Freq(MHz) Pwr(dBm) SNR(dB)  SQ Offset(MHz) Lock Volts(V) Cur(mA)  ODU SWiM
    99/1       274.00    -38.1    13.4  95       -1.09  YES      0.0       0  SL3    1  
    99/2       274.00    -38.4    13.6  96       -1.09  YES      0.0       0  SL3    1  
    99/3       314.00    -38.9    12.5  93       -1.09  YES      0.0       0  SL3    1  
    99/4       314.00    -38.9    12.6  94       -1.10  YES      0.0       0  SL3    1  
    99/5       354.00    -38.6    13.1  95       -1.09  YES      0.0       0  SL3    1  
    99/6       354.00    -38.5    13.2  95       -1.10  YES      0.0       0  SL3    1  
    99/7       394.00    -38.9    12.5  93       -1.10  YES      0.0       0  SL3    1  
    99/8       394.00    -38.8    12.5  93       -1.73  YES      0.0       0  SL3    1  
    99/9       434.00    -38.5    13.1  95       -1.10  YES      0.0       0  SL3    1  
    99/10      434.00    -38.7    13.3  95       -1.10  YES      0.0       0  SL3    1  
    99/11      474.00    -39.1    12.5  93       -1.10  YES      0.0       0  SL3    1  
    99/12      474.00    -39.0    12.4  92       -1.11  YES      0.0       0  SL3    1  
    99/13      514.00    -38.9    13.9  96       -1.11  YES      0.0       0  SL3    1  
    99/14      514.00    -39.7    13.6  96       -1.09  YES      0.0       0  SL3    1 
    

    Through 2way Splitter - Channel 1
    Code:
    Sat/Tr  Freq(MHz) Pwr(dBm) SNR(dB)  SQ Offset(MHz) Lock Volts(V) Cur(mA)  ODU SWiM
    99/1       274.00    -37.6    13.5  96       -1.09  YES      0.0       0  SL3    1  
    99/2       274.00    -37.8    13.6  96       -1.10  YES      0.0       0  SL3    1  
    99/3       314.00    -38.1    12.5  93       -1.10  YES      0.0       0  SL3    1  
    99/4       314.00    -38.1    12.6  94       -1.10  YES      0.0       0  SL3    1  
    99/5       354.00    -37.9    13.2  95       -1.10  YES      0.0       0  SL3    1  
    99/6       354.00    -37.8    13.2  95       -1.10  YES      0.0       0  SL3    1  
    99/7       394.00    -38.3    12.6  94       -1.10  YES      0.0       0  SL3    1  
    99/8       394.00    -38.3    12.5  93       -1.73  YES      0.0       0  SL3    1  
    99/9       434.00    -38.0    13.1  95       -1.10  YES      0.0       0  SL3    1  
    99/10      434.00    -38.0    13.2  95       -1.11  YES      0.0       0  SL3    1  
    99/11      474.00    -38.5    12.5  93       -1.11  YES      0.0       0  SL3    1  
    99/12      474.00    -38.3    12.5  93       -1.11  YES      0.0       0  SL3    1  
    99/13      514.00    -38.2    13.9  96       -1.11  YES      0.0       0  SL3    1  
    99/14      514.00    -39.0    13.5  96       -1.10  YES      0.0       0  SL3    1 
    

    Through F81 - Channel 9
    Code:
    Sat/Tr  Freq(MHz) Pwr(dBm) SNR(dB)  SQ Offset(MHz) Lock Volts(V) Cur(mA)  ODU SWiM
    99/1       274.00    -33.3    13.5  96       -0.92  YES      0.0       0  SL3    9  
    99/2       274.00    -33.3    13.5  96       -0.93  YES      0.0       0  SL3    9  
    99/3       314.00    -33.9    12.5  93       -1.18  YES      0.0       0  SL3    9  
    99/4       314.00    -33.9    12.6  94       -1.18  YES      0.0       0  SL3    9  
    99/5       354.00    -33.4    13.2  95       -0.93  YES      0.0       0  SL3    9  
    99/6       354.00    -33.4    13.2  95       -0.93  YES      0.0       0  SL3    9  
    99/7       394.00    -33.9    12.5  93       -1.18  YES      0.0       0  SL3    9  
    99/8       394.00    -34.0    12.5  93       -1.81  YES      0.0       0  SL3    9  
    99/9       434.00    -33.5    13.1  95       -1.19  YES      0.0       0  SL3    9  
    99/10      434.00    -33.6    13.3  95       -1.19  YES      0.0       0  SL3    9  
    99/11      474.00    -34.0    12.5  93       -1.19  YES      0.0       0  SL3    9  
    99/12      474.00    -33.9    12.4  92       -1.20  YES      0.0       0  SL3    9  
    99/13      514.00    -34.1    13.9  96       -1.69  YES      0.0       0  SL3    9  
    99/14      514.00    -34.8    13.6  96       -1.68  YES      0.0       0  SL3    9  
    

    Through W-CCK - Channel 9
    Code:
    Sat/Tr  Freq(MHz) Pwr(dBm) SNR(dB)  SQ Offset(MHz) Lock Volts(V) Cur(mA)  ODU SWiM 
    99/1       274.00    -37.7    13.5  96       -0.93  YES      0.0       0  SL3    9  
    99/2       274.00    -37.7    13.6  96       -0.94  YES      0.0       0  SL3    9  
    99/3       314.00    -38.3    12.5  93       -1.19  YES      0.0       0  SL3    9  
    99/4       314.00    -38.1    12.6  94       -1.19  YES      0.0       0  SL3    9  
    99/5       354.00    -37.8    13.1  95       -0.94  YES      0.0       0  SL3    9  
    99/6       354.00    -37.8    13.1  95       -0.94  YES      0.0       0  SL3    9  
    99/7       394.00    -38.5    12.6  94       -1.19  YES      0.0       0  SL3    9  
    99/8       394.00    -38.4    12.5  93       -1.82  YES      0.0       0  SL3    9  
    99/9       434.00    -37.9    13.1  95       -1.20  YES      0.0       0  SL3    9  
    99/10      434.00    -38.0    13.3  95       -1.20  YES      0.0       0  SL3    9  
    99/11      474.00    -38.5    12.4  92       -1.20  YES      0.0       0  SL3    9  
    99/12      474.00    -38.4    12.4  92       -1.21  YES      0.0       0  SL3    9  
    99/13      514.00    -38.1    13.8  96       -1.71  YES      0.0       0  SL3    9  
    99/14      514.00    -39.5    13.6  96       -1.69  YES      0.0       0  SL3    9 
    

    Through 2way Splitter - Channel 9
    Code:
    Sat/Tr  Freq(MHz) Pwr(dBm) SNR(dB)  SQ Offset(MHz) Lock Volts(V) Cur(mA)  ODU SWiM  
    99/1       274.00    -37.3    13.5  96       -0.91  YES      0.0       0  SL3    9  
    99/2       274.00    -37.3    13.6  96       -0.91  YES      0.0       0  SL3    9  
    99/3       314.00    -38.0    12.5  93       -1.16  YES      0.0       0  SL3    9  
    99/4       314.00    -37.7    12.6  94       -1.16  YES      0.0       0  SL3    9  
    99/5       354.00    -37.5    13.1  95       -0.91  YES      0.0       0  SL3    9  
    99/6       354.00    -37.5    13.1  95       -0.91  YES      0.0       0  SL3    9  
    99/7       394.00    -37.6    12.6  94       -1.16  YES      0.0       0  SL3    9  
    99/8       394.00    -37.9    12.4  92       -1.79  YES      0.0       0  SL3    9  
    99/9       434.00    -37.4    13.2  95       -1.17  YES      0.0       0  SL3    9  
    99/10      434.00    -37.6    13.3  95       -1.18  YES      0.0       0  SL3    9  
    99/11      474.00    -37.9    12.4  92       -1.18  YES      0.0       0  SL3    9  
    99/12      474.00    -37.9    12.4  92       -1.18  YES      0.0       0  SL3    9  
    99/13      514.00    -37.8    13.8  96       -1.68  YES      0.0       0  SL3    9  
    99/14      514.00    -38.9    13.6  96       -1.66  YES      0.0       0  SL3    9  
    

    It would appear the W-CCK has ~0.5 dB higher loss than a 2way, making the 2way and CCK option more preferable if all you care about is power level.
     
  2. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,683
    348
    Dec 9, 2006
    1) it's nice to see someone using the AIM to make these measurements.

    2) I'm not sure if 0.5 dB is anything more than "measurement error", or simply a variation between components under test. A larger test sample size should give some idea of this.

    3) There are several ways to "skin a cat". It looks like the W-CCK "merely" has a green labeled 2-way, which isn't the most effective method, as it could have been done with a BSF and a bypassing circuit that its DECA was connected to, which would have only needed 12 caps & 12 inductors, "at most".
     
  3. dielray

    dielray Legend

    234
    1
    Aug 5, 2009
    Appreciate the input VOS. I'll run this test a few more times when I get more WiFi DECAs.
     
  4. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,683
    348
    Dec 9, 2006
    I think you've already shown the significant information, which is they're using a damn internal splitter instead diplexing. I just don't understand why, as filtering would be more efficient.


    What this really shows is to NOT use a W-CCK off a 2-way splitter, as the DECA signal will have twice the loss needed to do the job.
     

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