Coax Collinear Element Materials and Velocity Factor
Hi Owen
I would like to put a question regarding a previous discussion.
Not having your e-mail address, I have to catch you on another thread.
I report below what you wrote at that time:
QUOTE
From TLLC, the matched line loss in dB of LMR400 (a foam coax of similar OD to
RG213) is
3.941e-6*f^0.5
+1.031e-11*f
The first term is due to R and the second due to G.
At 144MHz, the percentage of power lost per meter due to R is
(1-10^-(3.941e-6*f^0.5)/10)*100 is 1.08%. If you do similar for G, the loss is
0.034%, so loss in R is more than 30 times loss in G
UNQUOTE
I put those formulas on a spreadsheet, but I only obtain the 0.034% figure if I
change the second formula into +1.031e-5*f (instead of +1.031e-11*f)
Any comment?
Thanks and 73
Tony I0JX
Rome-Italy
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