Initial SWR Graphs for a 2-element SteppIR Yagi mounted at 35′ pointing due North taken 10/23/2012 using a RigExpert AA-54 analyzer and AntScope software.
Element spacing is 72″. Antenna was tuned using CREATE/MODIFY in the controller. Graphs shown here are for 10, 15 & 20 meters. 12 & 17 meter graphs will be added at a later date. With the antenna pointing due North, there may be some interaction with 40M & 80M inverted vees off the other tower.
20 Meter CW 14025 kHz Normal Mode (Driven = 396.4″, Director = 380.6″)10 Meter CW 28025 kHz Normal mode (Driven = 191.0″, Director = 183.0″)10 Meter CW 28025 kHz 180 mode (185.0″, Director 196.2″)10 Meter RTTY 28100 kHz Normal Mode (Driven = 190.3″, Director = 182.4″)10 Meter RTTY 28100 kHz 180 Mode (Driven = 184.4″, Director = 195.5″)10 Meter Phone 28500 kHz Normal Mode (Driven = 187.6″, Director = 179.8″)10 Meter Phone 28500 kHz 180 Mode (Driven = 181.8″, Director = 192.8″)15 Meter CW 21025 kHz Normal Mode (Driven = 262.3″, Director – 247.7″)15 Meter CW 21025 kHz 180 Mode (Driven = 250.5″, Director = 266.6″)15 Meter RTTY 21100 kHz Normal Mode (Driven = 261.0″, Director – 246.5″)15 Meter RTTY 21100 kHz 180 Mode (Driven = 249.3″, Director = 265.3″)15 Meter Phone 21350 kHz Normal Mode (Driven = 257.9″, 243.5″)15 Meter Phone 21350 kHz 180 Mode (Driven = 246.3″, Director = 262.1″)20 Meter CW 14025 kHz 180 Mode (Driven = 382.5″, Director = 403.8″)20 Meter RTTY 14100 kHz Normal Mode (Driven = 395.0″, Director = 379.3)20 Meter RTTY 14100 kHz 180 Mode (Driven =381.1″, Director = 402.4″)20 Meter Phone 14250 kHz Normal Mode (Driven = 390.8″, Director = 375.2″)20 Meter Phone 14250 kHz 180 Mode (Driven = 377.1″, Director = 398.1″)
