R 4-3/..., R 4-6/...
- R 4-3/… is a two-element Yagi antenna with 3 dBd gain. R 4-6/… is a three-element Yagi antenna with 6 dBd gain. Both antenna types are delivered in two versions – one covering the low end of the band ("l") and one covering the high end of the band ("h"), see specifications below.
- These Yagis incorporate baluns optimized for wide bandwidth and accurate matching. The entire balun unit and feeder cable inlet are completely sealed in a polythene moulding ensuring permanent waterproof connections. The antennas are supplied with a 3 m "tail" of RG 213 terminated with an N-female connector.
- Radiating elements, supporting booms and adjoining metal castings have been constructed in high quality aluminium alloys to prevent corrosion. All metal parts are DC-grounded.
- The antennas are designed for back mounting and are provided with rear extended booms. These antennas can be stacked and fed in phase with a matching harness for increased gain. A mast clamp for fixation on 30-58 mm diameter mast tube is enclosed.
|ANTENNA TYPE||2-element Yagi||3-element Yagi|
|FREQUENCY||l: 66 - 78 MHz
h: 75 - 88 MHz
|l: 66 - 76 MHz
h: 75 - 88 MHz
|IMPEDANCE||Nom. 50 Ω|
|POLARIZATION||Vertical or horizontal|
|GAIN||5 dBi 3 dBd||8 dBi 6 dBd|
|FRONT TO BACK RATIO||12 dBd||17 dBd|
|HALF-POWER BEAMWIDTH||E-plane: 75°
|MAX. POWER||150 W|
|ANTISTATIC PROTECTION||All metal parts DC-grounded (Connector shows a DC-short)|
|TEMP. RANGE||-25°C → +60°C|
|CONNECTION||3 m tail of RG 213 terminated with type “N” female connector|
|WIND SURFACE||0.162 m²||0.203 m²|
|WIND LOAD||205 N @ 160 km/h||257 N @ 160 km/h|
|MATERIALS||Elements/Boom/Saddle clamps: Aluminium alloys.
Fittings: Stainless steel.
|BOOM LENGTH||Approx. 1.6 m||Approx. 1.8 m|
|BOOM DIA.||31.8 mm|
|MAX. ELEMENT LENGTH||Approx. 2.15 m|
|DIA. OF ELEMENTS||19 mm|
|WEIGHT||Approx. 4.9 kg||Approx. 5.3 kg|
|MOUNTING||On 30 - 58 mm dia. mast tube|