Topband: RG6

[Jerry Bares]

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