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3B-334-4O HF Triband STACK antenna

3B-334-4O HF Triband STACK antenna
Product Code: 0109
Price: 840.00€
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3-Band STACK antenna 3B-334-4O

Tri-Band antenna with central wide spaced elements that can fit in antenna towers up to 1m wide. Specially designed for rotary towers and for antenna stacks.

Stack-tri-band-antenna-3B-334-4O3

Antenna design with wide spaced central elements was proposed by our 4O3 friends. 3-Band antenna can fit in the middle of rotary tower or fixed to USA or Japan in antenna stacks (in EU). We propose tower not wider than 0.8 m. It will perfectly fit with about 13 cm space from all elements to tower. Ideal for Triband stack.

Antenna uses common feed line. Input power limited by feed line only. Very low SWR, excelent F/B. Wind survival speed 170 km/h.

Electrical Specifications      
  14 MHz 21 MHz 28 MHz
Frequency Range: 14.0 - 14.35 MHz 21.0 - 21.45 MHz 28.0 - 29 MHz
Free Space Forward Gain: 7 dBi 7.8 dBi 9 dBi
Front to Back Ratio: 22 dB 26 dB 21 dB
3 dB Horizontal Beamwidth: 66° 65° 56°
Nominal Input Impedance: 50 Ohm 50 Ohm 50 Ohm
Maximum SWR at any freq.: 1 : 1.3 1 : 1.3 1 : 1.2
Maximum Power Input: More than 1.5 kW More than 1.5 kW More than 1.5 kW
       
Matching Method: Direct feed through current balun. One cable for all three bands.  
Connector: SO239 or "N"    
       
Mechanical Specifications      
Boom length: 6 m    
Boom: 80 x 80 mm or 70mm OD    
Longest element: 11.5 m    
No. of elements: 10    
Turning radius: 7 m    
Surface Area: 1.25 m2    
Mounting Mast Diameter: 43 - 70 mm    
Survival Wind Speed:   160 km/h     
Weight: 54 kg    

Two antenna stack:

Electrical Specifications Stack characteristics  
  14 MHz 21 MHz 28 MHz
Frequency Range: 14.0 - 14.35 MHz 21.0 - 21.45 MHz 28.0 - 29 MHz
Free Space Forward Gain: 9.66 dBi 11.27 dBi 12.15 dBi
Front to Back Ratio: 22 dB 19 dB 22 dB
3 dB Horizontal Beamwidth: 66° 65° 56°
Nominal Input Impedance: 50 Ohm 50 Ohm 50 Ohm
Maximum SWR at any freq.: 1 : 1.3 1 : 1.3 1 : 1.3
Spacing between antennas:   9 m
How two antenna stack behave: Like 14 MHz 5 el. monobander on 12 m boom Like 21 MHz 6 el. monobander on 12 m boom Like 28 MHz 7 el. monobander on 13 m boom
 
There are two versions of antenna:
 
1. Tri-band antenna 3B-334-4O to be used alone. 3-Band antenna have best SWR across all bands 
 
2. Tri-band antenna 3B-334-4O-Stack to be used in stack. Small difference is in element lengths that will improve SWR on all bands. 3-band antenna in stack will have best possible SWR as UPPER, LOWER and in STACK.
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