Barrett 4050 HF SDR Operating And Installation Manual

Also see for 4050 HF SDR: OPERATING AND INSTALLATION Manual Operating manual Installation guide OPERATING AND INSTALLATION Manual

Contents

Barrett 4050 HF SDR Operating And Installation Manual Manual pdf 135 page image

123BARRETT 4050 HF SDR TRANSCEIVER - INSTALLATION4011 Automatic Antenna Tuner for Base Station InstallationsAntennaVarious antenna configurations, such as vertical whips, long wires and loops,can be used for base station installations, using the Barrett 911 automaticantenna tuner. However, the following points should be considered:The antenna should be mounted as far away as possible from buildings, trees,vegetation and sources of electrical interference. If metallic masts or supportsare used for a long-wire antenna, arrange insulators to ensure the antenna isspaced at least two metres from the mast. Remember the radiating part of theantenna starts at the tuner. The location of the bottom portion of the antennais very important.Horizontal wire antennas have maximum radiation broadside to the antennawhen the frequency is less than ¼ wavelength. Radiation is at a minimum atthe end points of the antenna. Inverted “V” installation of horizontal antennasminimises the directivity and is recommended for omni-directional coverage.High voltages are present on the antenna system. The antenna tuner andantenna should be located or protected so that there is no possibility of acci-dental contact.The Barrett 4011 Automatic Antenna Tuner is designed for operation in landbase station and military whip installations.Housed in a fully weatherproof enclosure, the 4011 will tune long wire anten-nas effectively up to a length of 10 metres and wire loop antennas or whipantennas over a frequency range of 2 to 30 MHz. Tuning is rapid, typically lessthan one second the first time RF is applied, either whilst the operator is talkingor when the “Tune” control is activated on the transceiver (see page 83).The 4011 tuner features a memory facility that stores the configuration requiredto tune to a frequency. On any subsequent use of that frequency, the 4011reconfigures to the stored settings in typically less than 130 milliseconds. Fol-lowing initial tuning, the antenna’s VSWR is monitored. If any significant varia-tion occurs, the 4011 will re-tune the antenna automatically.The 4011 is supplied complete with coaxial / control cable having an overalllength of 30 metres (P/N 4017-01-01). The cable is a composite design incorpo-rating coaxial, power supply and control cables.