Call us at: +1 475 289 2222

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

 

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$1,895.00 **

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

6

24.5 ft

7.5 dBd/ 9.5+ dbi

15+ dB

15+ dB

Less than 1:5:1

450 kHz

24.25 ft

6

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

The next generation in design, quality and manufacturing

Copyright © 2017 - JK Antennas Inc.

a

Menu

The next generation in design, quality and manufacturing