Antenna VSWR

Here's a look at tracking antenna VSWR over time. The minimum VSWR frequency shifts down when an antenna gets coated with ice. Also, some repairs, tuning, etc. have taken place over time.
Date
Comments		 A3S Inverted V
40 Meters 20 Meters 15 Meters 10 Meters 40 Meters
August 2019
A3S installation
November 13, 2019
After replacement of TK trap that failed due to ice
February 15. 2020
A3S checked and element lengths set for mid-band. Antenna at top of mast and pointed North.
February 15. 2020
A3S checked and element lengths set for mid-band. Antenna at top of mast and pointed West.
March 15, 2020
Adjust driven element lengths to bring minimum SWR frequency in band
March 21, 2020
After ice melts off antenna
March 22, 2020
Warmer weather (52F) gets any remaining ice off antenna
March 28, 2020
After ice from last night melted. Yagi pointed north.
March 28, 2020
Adjusted driven element guy rope to get DE more parallel with other elements.
July 8, 2020
Adjusted driven element guy rope to get DE more parallel with other elements. A3S pointed NORTH.
July 8, 2020
Adjusted driven element guy rope to get DE more parallel with other elements. A3S pointed EAST.
July 8, 2020
Adjusted driven element guy rope to get DE more parallel with other elements. A3S pointed SOUTH.
July 8, 2020
Adjusted driven element guy rope to get DE more parallel with other elements. A3S pointed WEST.
December 14, 2020
Rotator replaced and driven element guy support post adjusted to make the driven element more parallel with the other elements. Also, it's snowing today, though ice nomrally lowers the resonant frequency (and here, resonant frequencies are high). It does not appear that any traps are damaged. When the weather improves, will investigate further. I SUSPECT the issue is the readjustment of the support mast. A3S pointed WEST.
December 17, 2020
Weather warmed up and snow melted. All looks good! Each band tested with 500 watts or more on A3S. A3S pointed WEST. The inverted V is used on several bands. The images show the frequency (the M2 frequency and VSWR) of each relative minimum in VSWR.




January 14, 2021. VSWR goes wacky. See here for details.
January 17, 2021. Above VSWR wackiness repaired. . See here for details.