HF Log-Periodic Antenna
CL247-X
The CD short-medium range CL247 series antenna system
has been designed to provide, unsurpassed short to
medium range performance through their respective
frequency ranges. Due to the characteristics in
log-periodic designes, these system provide radiation
efficiency which is maintained at a high level. This high
radiation efficiency assures that maximum input power is
radiated rather than partially dissipated. These systems
exhibit VSWR characteristics below 2.0:1 across the
designed frequency spectrum with the VSWR remaining
below 1.6:1 over 80 percent of the specified bandwidth.
The radiation pattern of these antennas exhibits a
front-to-back ratio exceeding -10 dB with front-side ratio
exceeding 20dB relative to the principle lobe intensity.
These characteristics assure a minimum of off-path
interference. Radiation pattern characteristics are shown
in the specification summary and have been examined
through calculations to provide maximum front gain at
take-off angles optimum to specified or required path
distance. Ground screens are not a part of these system
nor are they required, due to insignificant effects upon
performance over average or poor earth.
SPECIFICATIONS
Model No. CL247L CL247B CL247M
Frequency Range 2~30MHz 3~3OMHz 4~30MHz
Forward Gain
Azimuth Half Power
lOdBi 1 IdBi 12dBi
Beam Width 80°~60° 75°~60° 70°~55°
Front/Back Ratio lOdB lOdB lOdB
VSWR, Maximum
Power Handling
2:1 2:1 2:1
Capability – Refer to Note Below –
Input Impedance
Wind Loading
50 ohms 50 ohms 50 ohms
Capability 45 m/s 45 m/s 45 m/s
System Net Weight 1950 Kg 1100 Kg 1050 Kg
Note: Use an appropriate sub-model number when specitying or ordering a system.
Power
CL247x-l. Receive
CL247X-1. Transmit, lkW/2kW PEP
CL247x-3. Transmit, 5kW/10kW PEP
CL247x-4. Transmit, 10kW/20kW PEP
Connector
-N- Female
-N- Female
7/8″ EIA Female
1-5/8″ EIA Female