Barrett PRC-4090 - 4011 Automatic Antenna Tuner for Base Station Installations

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BARRETT PRC-4090 TACTICAL HF SDR TRANSCEIVER - INSTALLATION
4011 Automatic Antenna Tuner for Base Station Installations
Antenna
The following points should be considered when mounting an antenna with
the 4011:
• The antenna should be mounted as far away as possible from buildings,
trees, vegetation and sources of electrical interference. If metallic masts or
supports are used, arrange insulators to ensure the antenna is spaced at
least two metres from the mast.
• The radiating part of the antenna starts at the tuner. The base of the
antenna should be centrally located as per above criteria.
• High voltages are present on the antenna system. The antenna tuner and
antenna should be located or protected so that there is no possibility of
accidental contact or danger of RF burns.
Antennas such as long-wires, vertical whips and loop congurations require an
Antenna Tuning Unit to operate correctly.
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 whip
antennas over a frequency range of 2 to 30 MHz. Tuning is rapid, typically less
than one second the rst time RF is applied, either whilst the operator is talking
or when the “Tune” control is activated on the transceiver (see page 107).
The 4011 tuner features a memory facility that stores the conguration required
to tune to a frequency. On any subsequent use of that frequency, the 4011
recongures to the stored settings in typically less than 130 milliseconds. Fol-
lowing initial tuning, the antenna’s VSWR is monitored. If any signicant varia-
tion occurs, the 4011 will re-tune the antenna automatically.
The 4011 is supplied complete with coaxial / control cable having an overall
length of 30 metres (P/N 4017-01-01). The cable is a composite design incorpo-
rating coaxial, power supply and control cables.
Transceiver and Tuner Mounting
The transceiver should be mounted in a suitable position allowing easy operator
access. The antenna tuner should be mounted, preferably out of the weather,
and as close to the ground (earth) point as possible. The interconnect cable sup-
plied with the antenna tuner should be routed, away from other cables, back
to the transceiver and connected as indicated in the diagram. The maximum
interconnect cable should be less than 25 metres.