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C31XR-JK - 3 Elements on 20M / 4 Elements on 15M / 6 Elements on 10M / 30 Foot Boom
Re-Designed, Optimized & Improved from the Classic Force 12 design
Click here for a PDF version of theC31XR-JK manual
The C31XR-JK (Tribander) has been re-designed, optimized & Improved from the very popular Force 12 Tribander of all times for contesters and Dx'ers.
Here are the important changes/features from the classic design ....
1. The Boom has been shortened by a foot to make it a 30Ft boom yagi
2. The feed point for 20M, 15M & 10M are connected using a transmission line, the same way as the JK-MidTri & JK-BigTri.
3. The mast mount position is right at the center of the antenna at 180" with a gap of 25" on either side for a total gap of 50", which enables unhindered mounting on ring-rotors or side-mounting on towers.
4. The total number of elements on 10M has been reduced by 1 (one) element while optimizing gain and swr.
5. 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$2,395.00 **
Approx wt. = 110 lbs
Wind Area "C" = 12.4 Sq. Ft
"G" = 22.32 Sq. Ft
Projected Area = 18.60 Sq. Ft
Max Wind Speed = 100 Mph
Max Turning Radius = 24 Ft
Feedpoint = Direct 50-Ohm
FREESPACE PLOTS - Single Antenna
6
24 ft
8+ dBd/10+ dbi
20+ dB
20+ dB
850 kHz
650 kHz
18 ft
4
24.5 ft
7.5 dBd/ 9.5+ dbi
15+ dB
15+ dB
Less than 1:5:1
450 kHz
24.25 ft
3
26.5 ft
6+ dBd/8.2 dbi
18 dB
18 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 35Ft. (Freespace)
70 ft above Ground PLOTS - Single Antenna
*** Gain above ground are NEC4 modeled numbers over Average/Flat ground ***
90/55 feet STACK above Ground PLOTS
*** 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