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Old 29th Sep 2019, 5:38 pm   #99
James Duncan
Pentode
 
Join Date: May 2010
Location: Wick, Scotland, UK.
Posts: 164
Default Re: Antenna recommendation for 40 and 80M bands

Well done
that is exactly the way a correctly cut dipole will perform ,
20 works well on a 80 meter antenna as it is the harmonic.
if you want 40 just add an extra dipole to your antenna,and all will work well.
as to SWR, it is often overlooked that a dipole has an impedance of 73 ohms and the coax is 50 ohm so 75/50 = near 1.5 to 1 is the best real SWR that should be expected, anything up to 2-1 is fine.
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