A device for mounting an antenna on a surface or object, and is particularly suitable for use on a motive vehicle. The device is rotatable to a fixed operative-position for the antenna, which may have the antenna projecting in an upright or vertical direction, eventhough the surface on which the device is mounted, is inclined with respect to ground. The fixed operative-position for the antenna may be incrementally varied. Upon the application of an external force, the antenna may be released from the fixed position and rotated to a non-operative position for protecting the antenna, in the event the over head space is limited; and thereafter, the antenna may be returned to the precise operative-position.
A linearly polarized omnidirectional antenna includes one or more dipoles having an elongated tubular conductive radiator of a length that is about half the wavelength of the midband frequency, and an elongated inner conductive member extending longitudinally through the interior of the radiator and spaced therefrom. A coaxial cable or other feed means conducts signals to and from one end of the radiator and to and from the inner conductive member. The impedances of the dipole and the feed means are matched over a selected frequency band, such as by the use of a series inductive reactance between the feed means and the radiator. Two such dipoles can be connected to a colinear, center-fed pair, and two or more such dipole pairs can be arranged in a colinear array having a common inner conductive member.
Cassegrain Antenna With Improved Subreflector For Terrestrial Communication Systems
A Cassegrain antenna for use in terrestrial communication systems. The antenna has the conventional subreflector including a central area which provides tapered illumination of the entire main reflector, and a peripheral area which directs spillover from the central area onto the peripheral portion of the main reflector to improve the uniformity of illumination of the main reflector, thereby improving illumination efficiency and reducing gain loss due to spillover. The central and peripheral areas of the subreflector are preferably both surfaces of revolution of conic sections of the same kind, such as hyperboloids, ellipsoids or paraboloids, although the peripheral area may be a frustoconical surface if desired. The virtual focal points of the two conic sections of the subreflector are both coincident with the phase center of the feed horn.
Avera Orthopedic Surgery Specialists 701 8 Ave NW STE A, Aberdeen, SD 57401 6052262663 (phone), 6052260095 (fax)
Education:
Medical School Ohio State University College of Medicine Graduated: 1985
Procedures:
Hip Replacement Occupational Therapy Evaluation Spinal Cord Surgery Spinal Fusion Spinal Surgery Arthrocentesis Carpal Tunnel Decompression Hip/Femur Fractures and Dislocations Knee Arthroscopy Knee Replacement Lower Arm/Elbow/Wrist Fractures and Dislocations Lower Leg/Ankle Fractures and Dislocations Shoulder Arthroscopy Shoulder Surgery
Conditions:
Fractures, Dislocations, Derangement, and Sprains Hallux Valgus Internal Derangement of Knee Internal Derangement of Knee Cartilage Internal Derangement of Knee Ligaments
Languages:
English Spanish
Description:
Dr. Macdougall graduated from the Ohio State University College of Medicine in 1985. He works in Aberdeen, SD and 1 other location and specializes in Orthopaedic Surgery and Orthopaedic Surgery Of Spine. Dr. Macdougall is affiliated with Avera St Lukes Hospital, Huron Regional Medical Center, Mobridge Regional Hospital & Clinics and Sanford Hospital Webster.
Medical School University of Chicago Pritzker School of Medicine Graduated: 1998
Procedures:
Shoulder Surgery Arthrocentesis Knee Arthroscopy Shoulder Arthroscopy
Conditions:
Fractures, Dislocations, Derangement, and Sprains Internal Derangement of Knee Internal Derangement of Knee Cartilage Osteoarthritis Rotator Cuff Syndrome and Allied Disorders
Languages:
English
Description:
Dr. MacDougall graduated from the University of Chicago Pritzker School of Medicine in 1998. He works in Lafayette, CO and 1 other location and specializes in Orthopaedic Surgery and Orthopedic Sports Medicine. Dr. MacDougall is affiliated with Avera St Lukes Hospital, Good Samaritan Medical Center and St Joseph Hospital.
South Hills Cardiology AssocsSouth Hills Cardiology Associates 2000 Oxford Dr STE 305, Bethel Park, PA 15102 4129427900 (phone), 4129427918 (fax)
Education:
Medical School Wake Forest University School of Medicine Graduated: 1981
Procedures:
Echocardiogram Angioplasty Cardiac Catheterization Cardiac Stress Test Cardioversion Continuous EKG Electrocardiogram (EKG or ECG) Pacemaker and Defibrillator Procedures
Conditions:
Congenital Anomalies of the Heart Paroxysmal Supreventricular Tachycardia (PSVT) Abdominal Aortic Aneurysm Acute Myocardial Infarction (AMI) Acute Renal Failure
Languages:
English
Description:
Dr. MacDougall graduated from the Wake Forest University School of Medicine in 1981. He works in Bethel Park, PA and specializes in Cardiovascular Disease. Dr. MacDougall is affiliated with St Clair Hospital.