HF Ultimate Contest Triband Antenna 3B345HD 20m 15m 10m

HF Ultimate Contest Triband Antenna 3B345HD for upper three bands 20m, 15m, and 10m with full-size elements without compromise. Be the first in pileups.

Intended for serious DX hunting and ultimate contesting. Highest possible gain and F/B for its length with excellent SWR on all frequencies.

Rugged construction. Strong boom (80 x 80 mm) and sturdy initial diameters of elements will ensure high resistance to high winds and snow.
20m starting element diameter 35 mm.
15m and 10m starting diameter of elements 25 mm.

 

HF Ultimate Contest Triband Antenna 3B345HD appearance

 

What does 3B345HD mean?

• 3B – 3Band Covers 20m 15m and 10m HF Bands with low SWR
• 3– 3 elements for 20m
• 4 – 4 elements for 15m
• 5 – 5 elements for 10m 
• HD – Heavy Duty Construction

The antenna uses a common feed line. Input power is limited by the feed line only. Very low SWR on all bands.

 

Electrical Specifications of HF Ultimate Contest Triband Antenna 3B345HD

20m band:

Frequency range: 14-14.35 MHz
Free Space Forward Gain: 7 dBi
Front-to-back Ratio: 22 dB
-3 dB Horizontal Beamwidth: 66.1°
Maximum SWR at any frequency: 1.2

 

HF Ultimate Contest Triband Antenna 3B345HD 20m Azimuth Radiation Pattern

 

15m band:

Frequency range: 21-21.45 MHz
Free Space Forward Gain: 8.9 dBi
Front-to-back Ratio: 19 dB
-3 dB Horizontal Beamwidth: 60.3°
Maximum SWR at any frequency: 1.3

 

HF Ultimate Contest Triband Antenna 3B345HD 15m Azimuth Radiation Pattern

 

10m band:

Frequency range: 28-28.8 MHz
Free Space Forward Gain: 10.4 dBi
Front-to-back Ratio: 23 dB
-3 dB Horizontal Beamwidth: 51.8°
Maximum SWR at any frequency: 1.2

 

HF Ultimate Contest Triband Yagi 3B345HD 10m Azimuth Radiation Pattern

 

Common Electrical characteristics of the HF Ultimate Contest Triband Antenna 3B345HD

Nominal Input Impedance: 50 Ohm
Maximum Power Input: More than 1.5 kW (up to 3.5 kW by order)
Matching Method: Direct feed through a current balun. One cable for all three bands.
Connector: SO239 Teflon Silver Plated

 

Mechanical specifications of the ultimate HF antenna 3B345HD

Number of Elements: 12 Full-Size Elements
Elements Diameter: Tapered elements 35mm to 8 mm
Longest Element: 11.5 m
Element Mounting Position: Below the Boom
Balun and Connector: Included
Boom Length: 8m
Boom Size: 80 x 80 mm + 60 x 60 mm
Turning Radius: 7 m
Number of Boom Pieces: 4
Guy rope support: Yes, Included Stainless Steel AISI 316L rope 4 mm
Mounting Mast or Tower Diameter: 43 – 70 mm 1-11/16″ – 2-3/4″ OD (by order up to 500mm)
Clamp: 2 x M12 Stainless Steel AISI 316L (A4)
Survival Wind Speed:150 km/h
Surface Area: 1.2 m2
Net Weight: 75 kg
Gross Weight: 80 kg
Transportation length: 2.7m

 

Stack of two 3B345HD antennas on 11m vertical distance:

20m band gain: 10.32 dBi
15m band gain: 12.14 dBi
10m band gain: 13.26 dBi

 

HF ultimate contest triband antenna 3B345HD and details:

 

HF Ultimate Triband Antenna 3B345HD Common Feed Line

 

HF Ultimate Triband Antenna 3B345HD Gain and Label

 

 

HF Ultimate Contest 3Band Antenna 3B345HD View

 

Antennas-Amplifiers Product Benefits. A Major advance in Amateur Radio antenna design.

 

• Gain and F/B superiority.

All antennas have been calculated using state-of-the-art full 3D Electromagnetic Simulation Software including the influence of the boom, bracket, baluns, and connectors.
The performance of antennas designed using these techniques is exceptional, far better than antennas designed using “wire” programs.

Comparison of EM simulation software

• No tuning antennas
  

Before dispatch, we assemble each antenna and test antenna characteristics. That means you may expect exceptionally good electrical and mechanical characteristics including low SWR across the designed range immediately after assembling.
No need to tune the dipole, or any other element to get perfect SWR on the intended frequency range. Everything is pre-tuned.

• Easy to set up

Everything is labeled, just put number to number. The antenna can be assembled with hand tools.
Everything is included in the antenna box: Antenna, balun with connector, bracket, and pre-set guy rope support. Yours is to assemble and have fun!

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