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I am in the process of making DIY cables for component video and digital using Belden 1695a and Cardas GRMO male RCA's and have a few questions regarding termination. First, should I use a separate telescoping shield? Will it improve or degrade sound quality in any way? Second, depending on answer to first question, if I use a telescoping shild how are the connections made to the RCA's? Please see the diagram below.I understand the center wire (4) attaches to the center pin on both RCA's, and the braided coax shield (3) should be attached to the inside of the barrel on both RCA's, but I am not sure how to connect a separate telescoping shield (1). If we assume the picture represents the load end of a cable, and the telescoping shield (1) is not attached at the other end of the cable (floating), do you attach a 0.01 uF capacitor between the telescopic shield and the RCA barrel at the load end? Is this correct?
----------------------- 1
----------------------- 2
....................................---------- 3
...................................................------ 4
....................................----------
----------------------------------------------
1 - telescopic shield
2 - jacket
3 - sleve with braid over it
4 - center wire
Follow Ups:
[ If we assume the picture represents the load end of a cable, and the telescoping shield (1) is not attached at the other end of the cable (floating), do you attach a 0.01 uF capacitor between the telescopic shield and the RCA barrel at the load end? Is this correct? ]Not quite. You would place the 0.01 uf DISC CERAMIC cap as you stated, but the source end of the extra shield would be connected to ground.
What this type of connection does, is provide a "floating shield" within the operating band of the cable, yet terminates the shield at higher RF frequencies.
Jon Risch
I am also making the DIY digital cables. I am building the
cable using a 0.01 mfd ceramic capacitor, without the
telescoping shield.I am providing a link to an image illustrating how this cable could be made. If this is correct, I will leave this image posted as a reference for others who want to build this type of cable.
To see the image go to:
http://homepage.mac.com/petshop/digitalcableshield01.jpgPlease let me know if this image needs to be corrected. If time permits, I will also post another illustration using a telescoping shield and capacitor.
Thanks,
Petshop
In the previous reply, I had an incorrect illustration of the DIY digital cable with telescoping shield and capacitor. I have corrected the image and Jon Risch approved it. Sorry for any confusion this might have caused.I hope this helps.
http://homepage.mac.com/petshop/digitalcableshield01.jpg
This is not how to connect a coax that does not have an additional outer shield braid, if using the coax stock, the braid MUST be hard connected to gorund at both ends.
Jon Risch
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