For a given cable size, impedance, and conductor material - one can
compare center conductor diameters to find the cable with lowest loss.
The one with the airiest dielectric will have the largest center
conductor and the lowest loss.
-Steve K8LX
On 11/14/19 21:26 PM, jimlux wrote:
On 11/14/19 6:08 PM, Robert Harmon wrote:
Interesting stuff. I got on the Trilogy website, they have a
corrugated copper outer conductor too. Can't
find loss specs for lower HF freqs. Also suppliers and cost.
For HF, the loss is dominated by the skin effect in the shield and
center conductor - especially for hardline, which has almost no
dielectric. So the loss will go as sqrt(f). If the loss is, say,
10dB/ft at 10 MHz it will be 3.2 dB/ft at 1 MHz.
More details here:
https://www.microwaves101.com/encyclopedias/coax-loss-calculations
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