RG6 measurement: RG6 Double Shield Flooded CopperClad center
Source: ebay
CommScope Underground RG6 Coaxial Cable Burial 1000ft ( 180974083483 )
Product Code 4844003 DJT061220121
Measured Data - 1000ft +/- 2.5 %
Spool#1 DC Ohms Shield 7.7 Center 26.3
Spool#2 DC Ohms Shield 7.9 Center 27.9
Connectors installed
Spool#1 Shield resistance 8.6 Ohms
Spool#2 Shield resistance 9.3 Ohms
RF measurement HP 8753B 50Ohms
|s21|- insertion loss
Spool#2 Freq/loss[dB] 1.8/4.17, 3.5/4.82, 7.0/5.8, 10/7.3
Spool#1 Freq/loss[dB] 1.8/4.13, 3.5/4.80, 7.0/5.75, 10/7.27
Inserted two 5filliar 50/75 transformers < 0.1 dB loss and recalibrated VNA
|s21| in 75Ohms system
Spool#1 Freq/loss[dB] 1.8/4.4, 3.5/5.0, 7.0/5.8, 10/6.5
Spool#2 Freq/loss[db] 1.8/4.5, 3.5/5.17, 7.0/5.9, 10/6.6
|s11| Return loss - floor >50dB with calibration 75 Ohms load
Spool#1 Freq/RL[dB] 1.8/ 30, 3.5/32, 7.0/33, 10/34
Spool#2 Freq/RL[dB] 1.8/29, 3.5/33, 7.0/42, 10/34
Conclusion:
Could not find Commscope Product code 4844003, the product is more like
4843003 but black.
Double shield not as good as quad especially at low frequencies, may not be a
issue for me.
Need to figure out how to install connectors without the additional shield
resistance increase.
Ref:
http://www.commscope.com/catalog/broadband/product_details.aspx?id=46933
73, Jerry, na0m
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Topband Reflector
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