TLDetails calculates additional 0.77db loss with 150 Ohm at the feed point
and 0.8db at 16.67 Ohm with your example.
With Belden 8262 of the same length the program shows additional losses of
From: email@example.com [mailto:towertalk- And since we're
talking numbers, consider this one -- the WORST CASE
additional loss due to a 1.5:1 mismatch (measured at the antenna) is
0.18dB, no matter how long the line or how much the matched loss, and
for lines with low loss the additional loss is even smaller. Using that
previously cited family of plotted curves in the ARRL Handbook for your
28 MHz example, a 2 dB matched loss (about of 300 ft of LMR400 at 28
MHz) would be increased by only 0.1dB by a 1.5:1 mismatch.
TowerTalk mailing list