A430S10
A430S10
The document provides specifications for two models of 70cm Yagi Antennas: A430S10 and A430S15. Both models operate within the 430-440 MHz frequency range and have a power rating of 100 W with a nominal impedance of 50 Ohms. The A430S10 offers a gain of 13.1 dBi and a front-to-back ratio of 15 dB, while the A430S15 provides a gain of 14.8 dBi and a front-to-back ratio of 14 dB. The boom lengths are 1190mm for A430S10 and 2245mm for A430S15, with respective weights of 0.65 kg and 1 kg.
Antenna Assembly
The assembly process involves removing the antenna from the package, adjusting elements to the marked positions, and tightening wingnuts. Weatherproofing connections is recommended to prevent moisture absorption in coaxial cables. The antennas can be installed for vertical or horizontal polarization. For vertical polarization, a non-metallic support is advised, and coax cables should be run away from the beam at right angles. Horizontal mounting is straightforward with center boom mounting. Phasing of two beams can be achieved using a 75-ohm coaxial cable and T-connector.
Installation Recommendations
The document emphasizes minimizing metal effects in the vertical plane and suggests using a fabricated extension for mounting. It also provides guidance on the positioning of the antennas when phasing two beams, ensuring cable connections enter from the same side.
Distribution
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY, located in Braselton, GA.
Catalog excerpts
A430S10 & A430S1570cm Yagi Antennas Model: A430S10 Impedance (nominal): 50 Ohms 50 Ohms Front To Back Ratio: 15 dB 14 dB Driven Element diameter: 0.50” 12.7mm Parasitic Elements diameter: 0.37” 9.4mm Antenna Assembly (1) Remove antenna from package and adjust elements to proper position. You will find a small mark on the center of each element to aid in its positioning. Tighten each wingnut after verifying proper positioning. (2) Weatherproofing connections. As coaxial cables tend to absorb moisture through their connectors, it is recommended that the connector be sealed. There are several products available for this purpose, including a good grade of electrical type or a rubber compound tape. The Diamond 70cm Beam Antennas are easy to assemble and install. Only a few cautions are necessary in their installation. The A430S10 & A430S15 may be installed for either vertical or horizontal polarization. (a) Vertical polarization (preferred for FM operation): If mounting to a vertical support or pole at the boom center, be sure this support is non-metallic. A fiberglass or waterproofed hardwood extension should work satisfactorily. End mounting is a good option with the A430S10, as the coax cable may be run along the boom and down the vertical support. The idea is to minimize the effects of metal in the vertical plain. It will be necessary to fabricate an extension capable of sliding inside the boom, being secured by the screw passing through the boom (at the reflector element). Another way of mounting vertical beams is on a bracket to position beam away from the vertical support in order to reduce its effects. Coax should be run away from the beam at right angles (or off the reflector end). See Figure 2. (b) Horizontal mounting to the vertical support is easily accomplished with center boom mounting. (c) Phasing of two beams may be accomplished with a special coax phasing section using 75 ohm coaxial cable and T-connector. Note that the two antennas are mounted to the stacking boom in the same position. The cable connection must enter each from the same side as shown in Figure 4.
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Position element for center marker Tighten Wingnuts Figure 3 DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY 5340 BBS Way • Braselton GA 30517 •(770) 614-7443
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