Active Receiving Antennas - Broadband Power Technology：有源接收天线的宽带电力技术.pdf

Active Receiving Antennas Dressler Active Receiving Antenna Installation Information ARA 2000 shown New Installation information: (See page 4) The ARA 60 and HDX 100 antennas operate very well when mounted at ground level. Low mounting greatly reduces the possibility of the coax reacting with the RF signal to inadvertantly increase the effective length of the monopole antenna and minimizes man made noise pickup by the antenna and coax. Read more in the ARA 60 and HDX 100 mounting section on page 4. Introduction: The Dressler ARA Active Receiving Antenna products are an excellent investment for your shortwave listening pleasure. Our customers routinely tell us that they consider them to be the best commercially available active antenna product on the market. The ARA antennas are small, light and very easy to install. Even indoors, they provide excellent performance across their entire band ranges without any tuning. The ARA 60 compares favorably with long wire antennas in terms of signal strength. In addition, the ARA products are Electrically Short and offer the advantage of receiving a lower level of disturbances due to electrostatic discharge and other man made (QRM) noise. The ARA low profile also offers wind resistance to 100 MPH, when mounted on a suitable structure. All standard ARA models provide about 7-14 dB of gain and low noise figures which can enhance the sensitivity of virtually any shortwave receiver. We now offer LMR-240 (Ultra-Flex) low loss cable as an option for the ARA UHF products. The low loss cable typically increases signal sensitivity by about 6 dB* as compared to using standard RG-58/U cable. The HDX models are designed to withstand a higher level of ambient signal level and are best suite for urban locations with high