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The Spartan (Tribander) has been designed for the bottom of the sun-spot cycle and also to act as a simple 2-element monobander yagi on 17M, 20M & 40M. This design was accomplished by interlacing a 2-el-20 & 2-el-17 on to the same boom as the JK402.
Here are the important features ....
1. The feed point for 17M, 20M & 40M are connected using a transmission line, the same way as the JK-MidTri & JK-BigTri.
2. The mast mount position is right at the center of the antenna at 108".
3. All the 3 bands are connected with a single-feed (50-ohms)
4. The overall gain and swr on all bands is consistent & provides excellent performance.
Price : US$2085.00 **
Approx wt. = 115 lbs
Wind Area "C" = 10.67 Sq. Ft
"G" = 19.19 Sq. Ft
Projected Area = 16.01 Sq. Ft
Max Wind Speed = 100 Mph
Max Turning Radius = 26 Ft
Feedpoint = Direct 50-Ohm
Peak Gain is shown over a dipole in Freespace
Dipole in Freespace = 2.14dBi
FREESPACE PLOTS - Single Antenna
4.5+ dBd/ 6.5+ dbi
Less than 1:5:1
4.4 dBd/ 6.5+ dbi
4+ dBd/ 6+ dbi
Active Boom Length
Peak Gain *
2:1 SWR Bandwidth
1.5:1 SWR Bandwidth
Max Element Length
*** PLEASE NOTE: 40M Performance or SWR curves can be adjusted for CW vs SSB operations
** All pricing shown assumes the basic mounting hardware. Additional costs may apply for customized mast plates and hardware