4 el. 17/12m Yagi

17/12 meter 4 element beam Yagi (18-24 MHz).

No traps or relays, one single coaxial cable.
This design uses a Reflector-Driven element on 17m and a Driven element-Director on 12m.

See SWR measurements made by Pat, F6GCP.

Specifications

• Forward gain in free space 17/12m (dBi): 6.4/6.8

• F/B ratio 17/12m (dB): 12/27

• Active element 17/12m: 2/2

• Frequency coverage 17m (MHz): 18.068 - 18.168

• Frequency coverage 12m (MHz): 24.890 - 24.990

• Bandwidth @ 1.5 VSWR 17/12m (kHz): 570/450

• Feed impedance (ohms): 50

• Power handling (kW): 5

• Longest element (m)/(ft): 8.71/28.6

• Boom length: 3.50/11.5

• Turning radius (m)/(ft): 4.65/15.3

• Weight (kg)/(lb): 13.5/29.7

• 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)

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).