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March 17th 14, 03:45 PM
posted to uk.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.misc
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Quad shield coax & dielectric?
In message , Brian
Morrison writes On Fri, 14 Mar 2014 15:51:51 -0700 Bob E. wrote: 75-ohm RG-6 coax: quad shield differs from "standard" RG-6 in that the dielectric is reduced in diameter to accomodate the extra shielding. How does this affect the performance? I'm looking at 1 GHz (HDTV use). Thanks. If the dielectric is reduced in diameter then to maintain the same Zo for the same Er the inner conductor will have to be reduced in diameter too. This will tend to increase the loss in the cable because of the increased resistive losses and the dielectric loss will be higher because the field is more concentrated in the dielectric. What is your prime requirement? Do you need the low loss or the good screening more? See existing thread. -- Ian --- news://freenews.netfront.net/ - complaints: --- |
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