How to minimize loss of Co-axial cable?

Thread Starter

dhivyaraman

Joined Jun 8, 2007
7
How to minimize the loss in co-axial cables? B'coz in our measurement, i am facing lot of problems with cable loss.i am working in the range 9kHz t0 18GHz
 

JoeJester

Joined Apr 26, 2005
4,354
Are your signals of interest within the characteristics of the cable?

Is the cable/connectors constructed properly ... no shorts between shield and center, shorts between shield on one and and the other shield end, shorts between center conductor on one end and the other center conductor end.

Is the sending unit [both hot and return] connected to the cable [center conductor and shield]? Is the receiving unit connected appropriately?

Is the loss within the published "loss" for the cable?
 

Papabravo

Joined Feb 24, 2006
14,393
How to minimize the loss in co-axial cables? B'coz in our measurement, i am facing lot of problems with cable loss.
After it has been manufactured there is almost nothing you can do. Cable loss is a fact of life. There are always more expensive alternatives like hardline.

What frequency range are you working with?
 

John Luciani

Joined Apr 3, 2007
477
How to minimize the loss in co-axial cables? B'coz in our measurement, i am facing lot of problems with cable loss.
You didn't say what frequency you are working with. If you are in the 100's of MHz
you could check out the National Semiconductor LMHxxxx buffer amplifiers. I believe
they have application notes that discuss driving co-ax cables.

(* jcl *)
 

beenthere

Joined Apr 20, 2004
15,819
Ther is coax, and there is coax. Losses in RG-59 are about four times as great as with RG-6. Check the specs on the coax you are using. The parameter that is probably causing the greatest loss is the capacitance per unit of length. You might check an insure that the coax has the proper impedance for your application, too.
 
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