|ALYX ANTENNA GUIDE
RHOMBIC ANTENNA FOR SHORTWAVE RADIO BROADCASTING
The rhombic antenna is a diamond-shaped antenna, suspended between 4 masts.
The 3 parameters of a rhombic antenna are:
- l : antenna leg length
- g : one half of the large interior angle
- h : antenna height
All legs of the antenna are the same length, and opposite angles of the diamond are equal.
The leg lengths of the rhombic must be an integral number of half wavelengths.
A typical rhombic antenna design would be at a height of between a half and a full wavelength.
There are 2 versions of the rhombic antenna, the resonant rhombic antenna and the terminated rhombic antenna.
The resonant rhombic antenna is bidirectional, while the terminated rhombic antenna is unidirectional.
A considerable amount of power may be lost in the terminating resistance
and represents the price that has to be paid for some desirable features
such as simplicity of construction, relatively wide bandwith of operation
and high directivity gain.
|TYPICAL RADIATION PATTERNS|
|Azimuth pattern||Elevation pattern|
|TYPICAL COVERAGE MAP|
|Frequency ranges||5-35 MHz|
|Input impedance||600-800 ohm balanced|
|Power ratings||up to 100 kW average|
|VSWR||2.5 : 1 or less|
|Specifications may change without notice|
|THIS TYPE OF ANTENNA IS AVAILABLE FROM|
|Manufacturer||Type number||Power Level|
|Power Level||L||low||1-5 kW|