4 el. 20m Yagi short boom

20 meter 4 element beam Yagi (14 MHz) - short boom.

Specifications

• Forward gain in free space (dBi): 8.5

• F/B ratio (dB): 21

• Frequency coverage (MHz): 14.000 - 14.350

• Bandwidth @ 1.5 VSWR (kHz): 390

• Feed impedance (ohms): 50

• Power handling (kW): 5

• Longest element (m)/(ft): 11.03/36.2

• Boom length (m)/(ft): 7.10/23.3

• Turning radius (m)/(ft): 6.37/20.9

• Weight (kg)/(lb): 24/52.8

• Wind survival (km/h)/(mph): 130/80.8

• Standard Mast size (mm)/(inch): 50/2 (55/2.25 or 60/2.50 optional at no extra cost).

Insulated guying of the boom

This antenna is supplied with two guys in polyester (longevity > 25 years), stainless steel tensioner/cable clamps and guy clamp that will be fixed to the mast (diameter choice).

Greases supplied

2 kinds of grease are supplied with your antenna:

• Aluminum contact grease: Professional grease containing 30% aluminum particles, recommended for the assembly of aluminum antenna tubes. Prevents binding, corrosion and the formation of aluminum oxide, and allows easy dismantling of antennas after several years.

• Copper conductive grease: Professional conductive grease with a copper base, recommended for all hardware requiring a sound and lasting electrical contact. Prevents oxydisation, damp ingress, and limits chemical reaction between stainless steel and aluminum.

Balun or no Balun ?

• This antenna does not require any balun.

• To avoid having stray current on the braid of a coaxial cable (often the cause of RF and/or TVI/BCI), you can make your own 1:1 choke balun with coaxial cable. Explanations are provided with antenna assembly instructions. (See also our F.A.Q).