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Discussion Starter · #1 ·
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.
 

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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".
 

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Discussion Starter · #3 ·
veryoldschool said:
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".
Appreciate the input VOS. I'll run this test a few more times when I get more WiFi DECAs.
 

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dielray said:
Appreciate the input VOS. I'll run this test a few more times when I get more WiFi DECAs.
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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