ROTOTILLER® X Series Circularly Polarized FM Antenna
The ROTOTILLER® X Series circularly polarized FM (88 – 108 MHz) antenna combines the exceptional engineering features of an internally fed, fully pressurized system with superior fabrication characterized by totally welded feed connections, rugged brass material and TIG welding. The ROTOTILLER X Series is available in low, medium, and super high power versions and is suitable for single frequency or multiplexed applications.
Characteristics
- Product LineROTOTILLER®
- Frequency Range88 - 108 MHz
- Multiplexed Versions AvailableYes
- Broadband ApplicationsNo
- PolarizationCircular
- Azimuth Pattern Circularity± 2 dB in free space
- Axial RatioLess than 3 dB in free space
- VSWR at Input1.07:1 or less (with field matching)
- 1.25:1 or less (with top pole or LAMBDA™ Mount)
- 1.50:1 or less (top mounted without field matching)
- Maximum Power Rating120 kW
ERI antennas are unchallenged in quality and dependability. ERI is the only manufacturer to use large diameter outer conductors and a completely enclosed, pressurized, internal series feed system. The result is a simple and reliable method of coupling power to the elements. Unlike competing designs, ERI series fed antennas do not require a troublesome secondary current loop for element excitation with all the resulting disadvantages. All ERI antennas include brackets for mounting on leg, pole, or face mounting (up to 42-inch uniform cross section tower); brackets for other mounting configurations are optionally available.
Feature/Benefits
- Low VSWR, superior VSWR band width, and minimal weather related VSWR problems
- Fully pressurized, internal feed and welded feed connections
- High input power capacity
- Modular construction facilitates easy installation and repair
- Rugged brass construction and stainless steel support brackets and hardware – Corrosion resistant construction
- Radomes or deicing heaters not normally required for radial ice less than 1/2-inch; however radomes or deicing heaters are available
- Quarter Wave Stub included
Type Number Definition
a - b c d e - f - g - h- aModel: SHPX | MPX | LPX
- bNumber of Bays
- cInterbay Line: Size A = 3 1/8 inch | B = 4 1/16 inch | C = 6 1/8 inch
- dInput Feed Configuration: E = End Fed | C = Center Fed for even number of bays, off center fed for odd number of bays
- eRF Input Size ("SHPX A" Series only): Blank = 3 1/8 inch | 6 = 6 1/8 inch
- fDesign Note1: Blank = Omnidirectional | DA = Directional Azimuth Pattern
- gDesign Note 2: Blank = Full wave length bay to bay spacing | HW = Half wave length bay to bay spacing
- hDesign Note 3: Blank = Standard Product | SP = Special Design
- ExampleSHPX-4AC-HW
- DescriptionERI Model SHPX ROTOTILLER FM Antenna, four bay, 3 1/8 inch interbay line, center fed, half wave length bay to bay spacing
Options
- Anti-rotation brackets
- Quarter wave stub - Included with SHPX, MPX, and LPX antennas
- Beam tilt (center fed antennas only)
- First null fill (center fed antennas only)
- Second null fill (center fed antennas only); Second null fill not available for LPX antennas
- Beam tilt and first null fill (center fed antennas only)
- Radomes
- Deicers
- Stem heaters
- Export packing
Related Publications
ROTOTILLER® X Series FM Antenna Product Brochure