On 11/14/2022 11:41 PM, Roy Morgan wrote:
Do not spend money on a remote antenna tuner till you understand transmission
line truth.
Yes, there is much that is misunderstood about transmission lines by
those who have chosen not to learn the fundamentals. The ARRL Handbook
is a great place to start.
Unless the transmission line for a 160M antenna is VERY long, it makes
little sense to go to the trouble of weatherproofing a dedicated
autotuner at the antenna, even if the antenna is a terrible match to the
line. That's because loss in any decent RG8 is quite low at 2 MHz, and
even with a fairly long line, bigger coax is probably a lower cost and
much simpler solution.
If you know the complex feedpoint impedance, there are many computer
programs and apps that can compute the loss in nearly all popular
feedline type. Many analyzers can measure it and output it as a data
file for use in those programs. The CD that comes with the ARRL Antenna
Book includes N6BV's TLW, which can make that calculation for the data
at any single frequency.
73, Jim K9YC
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