C31XR TriBander Yagi
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
PriceUS$2,695.00**
BUY NOWThe 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 ....
- The Boom has been shortened by a foot to make it a 30Ft boom yagi
- The feed point for 20M, 15M & 10M are connected using a transmission line, the same way as the JK-MidTri & JK-BigTri.
- 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.
- The total number of elements on 10M has been reduced by 1 (one) element while optimizing gain and swr.
- The overall gain and swr on all bands is consistent & provides excellent performance.
Specifications
C31XR-JK spec sheet
| 10M | 15M | 20M | |
|---|---|---|---|
| Number of Elements | 6 | 4 | 3 |
| Active Boom Length | 24 ft | 24.5 ft | 26.5 ft |
| Peak Gain * (dBi) | 10+ dBi | 9.5+ dBi | 8.2 dBi |
| Peak Gain * (dBd) | 8+ dBd | 7.5 dBd | 6+ dBd |
| Peak F/B | 20+ dB | 15+ dB | 18 dB |
| Peak F/R | 20+ dB | 15+ dB | 18 dB |
| 2:1 SWR Bandwidth | 850 kHz | SWR less than 1.5:1 across the entire band | SWR less than 1.5:1 across the entire band |
| 1.5:1 SWR Bandwidth | 650 kHz | 450 kHz | 350 kHz |
| Max Element Length | 18 ft | 24.25 ft | 36.5 ft |
Tap a band or swipe the cards →
10M
- Number of Elements
- 6
- Active Boom Length
- 24 ft
- Peak Gain * (dBi)
- 10+ dBi
- Peak Gain * (dBd)
- 8+ dBd
- Peak F/B
- 20+ dB
- Peak F/R
- 20+ dB
- 2:1 SWR Bandwidth
- 850 kHz
- 1.5:1 SWR Bandwidth
- 650 kHz
- Max Element Length
- 18 ft
15M
- Number of Elements
- 4
- Active Boom Length
- 24.5 ft
- Peak Gain * (dBi)
- 9.5+ dBi
- Peak Gain * (dBd)
- 7.5 dBd
- Peak F/B
- 15+ dB
- Peak F/R
- 15+ dB
- 2:1 SWR Bandwidth
- SWR less than 1.5:1 across the entire band
- 1.5:1 SWR Bandwidth
- 450 kHz
- Max Element Length
- 24.25 ft
20M
- Number of Elements
- 3
- Active Boom Length
- 26.5 ft
- Peak Gain * (dBi)
- 8.2 dBi
- Peak Gain * (dBd)
- 6+ dBd
- Peak F/B
- 18 dB
- Peak F/R
- 18 dB
- 2:1 SWR Bandwidth
- SWR less than 1.5:1 across the entire band
- 1.5:1 SWR Bandwidth
- 350 kHz
- Max Element Length
- 36.5 ft
* Peak gain is shown in free space. dBd = dBi − 2.1
Mechanical
- Approx wt.
- 110 lbs
- Wind Area “C”
- 12.4 Sq. Ft
- Wind Area “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
Patterns & SWR
20M · FREESPACE PLOTS - Single Antenna 
20M · STACK Plots - spaced at 35Ft. (Freespace) 
20M · 70 ft above Ground PLOTS - Single Antenna 
20M · 90/55 feet STACK above Ground PLOTS 
20M · SWR 
15M · FREESPACE PLOTS - Single Antenna 
15M · STACK Plots - spaced at 35Ft. (Freespace) 
15M · 70 ft above Ground PLOTS - Single Antenna 
15M · 90/55 feet STACK above Ground PLOTS 
15M · SWR 
10M · FREESPACE PLOTS - Single Antenna 
10M · STACK Plots - spaced at 35Ft. (Freespace) 
10M · 70 ft above Ground PLOTS - Single Antenna 
10M · 90/55 feet STACK above Ground PLOTS 
10M · SWR
Plots by band
*** Gain above ground figures are modeled over average/flat ground ***
*** Gain above ground figures are modeled over average/flat ground ***
*** Gain above ground figures are modeled over average/flat ground ***
Click any plot to open it full size.
** All pricing shown assumes the basic mounting hardware. Additional costs may apply for customized mast plates and hardware