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C3S-JK - 2 Elements on 20M / 2 Elements on 15M / 2 Elements on 10M / 12 Foot Boom
Re-Designed, Optimized & Improved from the Classic Force 12 design
The C3S-JK (Tribander) has been re-designed, optimized & Improved from the very popular Force 12 Tribander
Here are the important changes/features from the classic design ....
1. The feed point for 20M, 15M & 10M 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 72".
3. The overall gain and swr on all bands is consistent & provides excellent performance.
Peak Gain is shown over a dipole in Freespace
Dipole in Freespace = 2.14dBi
Price : US$965.00 **
Approx wt. = 39 lbs
Wind Area "C" = 5.82 Sq. Ft
"G" = 10.47 Sq. Ft
Projected Area = 8.72 Sq. Ft
Max Wind Speed = 100 Mph
Max Turning Radius = 19.5 Ft
Feedpoint = Direct 50-Ohm
Click here for a PDF version of the C3S-JK manual
FREESPACE PLOTS - Single Antenna
2
7.5 ft
4+ dBd/6+ dbi
10+ dB
10+ dB
800 kHz
550 kHz
18 ft
2
8.75 ft
4 dBd/ 6.3+ dbi
10+ dB
10+ dB
450 kHz
300 kHz
24.25 ft
2
9.5 ft
4+ dBd/6.5 dbi
10 dB
10 dB
Less than 1:5:1
350 kHz
36.5 ft
10M
15M
20M
Number of
Elements
Active Boom Length
Peak Gain *
Peak F/B
Peak F/R
2:1 SWR Bandwidth
1.5:1 SWR Bandwidth
Max Element Length
STACK Plots - spaced at 32Ft. (Freespace)
35 ft above Ground PLOTS - Single Antenna
*** Gain above ground are NEC4 modeled numbers over Average/Flat ground ***
** All pricing shown assumes the basic mounting hardware. Additional costs may apply for customized mast plates and hardware