R 4-3/..., R 4-6/...
Directional Antennas with 3 and 6 dBd Gain for the 80 MHz Band
DESCRIPTION
- 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.
R 4-3/...
R 4-6/...
ORDERING DESIGNATIONS
| TYPE | PRODUCT NO. | FREQUENCY |
|---|---|---|
| 2-element Yagi 3 dBd | ||
| R 4-3/l | 120000020 | 66 - 78 MHz |
| R 4-3/h | 120000019 | 75 - 88 MHz |
| 3-element Yagi 6 dBd | ||
| R 4-6/l | 120000022 | 66 - 76 MHz |
| R 4-6/h | 120000021 | 75 - 88 MHz |
SPECIFICATIONS
| ELECTRICAL | |||
|---|---|---|---|
| MODEL | R 4-3/... | R-4-6/... | |
| 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° H-plane: 150° |
E-plane: 70° H-plane: 120° |
|
| BANDWIDTH | 13 MHz | ||
| SWR | ≤ 1.5 | ||
| MAX. POWER | 150 W | ||
| ANTISTATIC PROTECTION | All metal parts DC-grounded (Connector shows a DC-short) | ||
| MECHANICAL | |||
| 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 | |
| COLOUR | “Aluminium” | ||
| 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 | ||
TYPICAL RADIATION PATTERN (E-PLANE)
If the antennas are mounted for vertical polarisation these curves show the radiation patterns in the vertical plane.
TYPICAL RADIATION PATTERN (H-PLANE)
If the antennas are mounted for vertical polarisation these curves show the radiation patterns in the horizontal plane (horizontal coverage).
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