Barrett 911 AUTOMATIC ANTENNA TUNER
SPECIFICATIONS
GENERAL
ANTENNA SELECTION
Frequency Range
1.6 to 30.0 MHz
Maximum power input
150 Watts (PEP)
Input impedance range
50 ohms nominal
DC power requirement
13.8V DC
Input current (average)
0.9 Amps
Random tune time
Typically less than 2 seconds
Recurrent tune time
Typically less than 10 milliseconds
Minimum antenna length
2.6 metres
3.3 to 30.0 MHz
7.0 metres
1.6 to 30.0 MHz
Operating temperature
-10C to +60C
Dimensions
350 x 284 x 70 mm
Weight
3.4 Kg
The Barrett 911 Automatic Antenna Tuner is designed for use in land base station
and maritime HF services. Primarily designed for operation with end-fed un-
balanced antennas such as whips and long wires, the tuner is built in a waterproof
impact resistant, moulded ABS plastic enclosure.
The 911 Automatic Antenna Tuner will operate into almost any end-fed antenna
with a length exceeding 2.5 metres, providing an effective ground (earth) is used.
The antenna efficiency will be proportional to the length of the antenna and will
be maximum when the length of the antenna approaches 1/4 wavelength. It is
advisable to limit the wire antenna to 1/4 or 3/4 wavelength at the highest
frequency to be used.
