The Kenwood TS520SE is designed for SSB and CW modes in the 160 through
10 meter ham bands. It also features receive of WWV at 15 MHz. Power
output is 100W.

Are you sure about the 100 watt output? The spec for the TS520S says
160 watt INPUT on CW and 200 watt INPUT on SSB. The adjustment section
of the service manual for a TS520S states that OUTPUT will be greater
than 80 watts on 3.75, 7.15, 14,175, and 21.225 MHz. It also states that
power output will be greater than 50 watts on 28.3, 28.8 and 29.4 MHz.