4 el. 40/30m Yagi

40/30m 4 element beam Yagi (7-10 MHz).

Shortened element with high-Q loading coils.
No traps or relays, one single coaxial cable.

Boom made from 55 and 50mm tube.
Elements made from 35 to 12mm tube.

Specifications

• Forward gain in free space 40/30m (dBi): 4.9/5.7

• F/B ratio 40/30m (dB): 14/17

• Active element 40/30m: 2/2

• Frequency coverage 40m (MHz): 7.000 - 7.200 MHz

• Frequency coverage 30m (MHz): 10.100 - 10.150

• Bandwidth @ 1.5 VSWR 40/30m (kHz): 100/150

• Feed impedance (ohms): 50

• Power handling (kW): 5

• Longest element (m)/(ft): 13.70/45

• Boom length: 5.50/18

• Turning radius (m)/(ft): 7.54/24.7

• Weight (kg)/(lb): 36/79.2

• Wind survival (km/h)/(mph): 125/77.7

• 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).