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Catalog > Antennas > FM Antennas > ROTOTILLER X Series

ROTOTILLER ® X Series Circularly Polarized FM Antenna

Characteristics

Product Line:ROTOTILLER
Product Series:X Series
Frequency Range:88 - 108 MHz
Multiplexed Versions Available:Yes
Broadband Applications:No
Polarization:Circular
Azimuth:± 2 dB in free space
Axial Ratio:Less than 3 dB in free space
VSWR at Input:
  • 1.07:1 or less (with field matching)
  • 1.25:1 or less (with top pole or LAMBDA Mounting System)
  • 1.50:1 or less (top mounted without field matching)
Maximum Power Rating:120 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.

ERI’s original and distinctive design 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 FM antenna’s unique design consists of two series fed, bent dipole elements which form a space phased, circularly polarized radiator. The antenna’s configuration and the large diameter of the radiating elements contribute to the excellent bandwidth of the antenna system, and also inhibits corona discharge.

The horizontally polarized horizontal plane azimuth pattern of the SHPX series antenna is omnidirectional within ±2 dB when the antenna is pole or LAMBDA™ Optimized Mounting System mounted atop a tower. Side mounting the antenna on a typical tower structure will affect the azimuth pattern. ERI offers a pattern measurement service to assist in determining the effect of the mounting structure on the antenna’s pattern. Using ERI’s pattern optimization service, the pattern’s circularity may be improved through the addition of parasitically excited elements.

Features/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

Ordering Information

Type Number Definition  
a - b c d e - f - g - h  
a 
 Model: SHPX, LPX, MPX 
b 
 Number of Bays 
c 
 Interbay Line Size: A = 3 1/8 inch | B = 4 1/8 inch | C = 6 1/8 inch 
d 
 Input Feed Configuration: E = End Fed | C = Center fed for even number of bays, off center fed for odd number of bays 
e 
 RF Input Size: Blank = 3 1/8 inch | 6 = 6 1/8 inch 
f 
 Design Note 1: Blank = Omnidirectional | DA = Directional Azimuth Pattern 
g 
 Design Note 2: Blank = Full wave length bay to bay spacing | HW = Half wave length bay to bay spacing 
h 
 Design Note 3: Blank = Standard product | SP = Special Design 
Example:  SHPX-4AC-DA-HW 
Description:  ERI Model SHPX ROTOTILLER FM Antenna, four bay, 4 1/8 inch interbay line, center fed, directional azimuth pattern, 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 (600w/220v)
  • Stem heaters (300w/220v)
  • Export packing

Note: Except where noted options available at additional cost.

Mounting Information

Utilize the ERI Advantage

Combine an ERI antenna with an ERI Mounting Structure, Pattern Measurement and Installation. Assure yourself of the best antenna/tower interaction. ERI’s Pattern Measurement service will provide the crucial answers concerning the relationship between the antenna mounting orientation and antenna pattern.

ERI Mounting Sections are designed to achieve optimum antenna performance while reducing weight and wind loads. Only ERI can offer you an antenna/tower/installation package that will achieve your highest expectations in a demanding FM market. Contact Electronics Research for complete electrical and mechanical specifications.

Related Publications

ROTOTILLER® X Series Circularly Polarized FM Radio Antenna

ROTOTILLER® X Series Circularly Polarized FM Radio Antenna Brochure > Download File

Topics Include: Antennas

(Type: Brochure; Publication Number: 20090316002_AEN; Language Code: EN; Revision: 01)


Type Number Number of
Bays		 Power Gain,
Numeric | dB		 Bay Spacing,
Wave Lengths		 Power Rating, kW
12
6.8781 numeric | 8.3747 dB
1
112
12
6.8781 numeric | 8.3747 dB
1
64
12
6.8781 numeric | 8.3747 dB
1
39
12
6.8781 numeric | 8.3747 dB
1
18
12
6.8781 numeric | 8.3747 dB
1
12
11
6.2783 numeric | 7.9784 dB
1
112
11
6.2783 numeric | 7.9784 dB
1
64
11
6.2783 numeric | 7.9784 dB
1
39
11
6.2783 numeric | 7.9784 dB
1
18
11
6.2783 numeric | 7.9784 dB
1
12
10
5.68 numeric | 7.5435 dB
1
112
10
5.68 numeric | 7.5435 dB
1
64
10
5.68 numeric | 7.5435 dB
1
39
10
5.68 numeric | 7.5435 dB
1
18
10
5.68 numeric | 7.5435 dB
1
12
9
5.0826 numeric | 7.0609 dB
1
112
9
5.0826 numeric | 7.0609 dB
1
64
9
5.0826 numeric | 7.0609 dB
1
39
9
5.0826 numeric | 7.0609 dB
1
18
9
5.0826 numeric | 7.0609 dB
1
12
8
4.4872 numeric | 6.5198 dB
1
112
8
4.4872 numeric | 6.5198 dB
1
64
8
4.4872 numeric | 6.5198 dB
1
39
8
4.4872 numeric | 6.5198 dB
1
18
8
4.4872 numeric | 6.5198 dB
1
12
7
3.8935 numeric | 5.9034 dB
1
112
7
3.8935 numeric | 5.9034 dB
1
64
7
3.8935 numeric | 5.9034 dB
1
39
7
3.8935 numeric | 5.9034 dB
1
18
7
3.8935 numeric | 5.9034 dB
1
12
12
3.732 numeric | 5.7194 dB
0.5
112
12
3.732 numeric | 5.7194 dB
0.5
64
12
3.732 numeric | 5.7194 dB
0.5
39
12
3.732 numeric | 5.7194 dB
0.5
18
12
3.732 numeric | 5.7194 dB
0.5
12
11
3.429 numeric | 5.3517 dB
0.5
112
11
3.429 numeric | 5.3517 dB
0.5
64
11
3.429 numeric | 5.3517 dB
0.5
39
11
3.429 numeric | 5.3517 dB
0.5
18
11
3.429 numeric | 5.3517 dB
0.5
12
6
3.3028 numeric | 5.1888 dB
1
120
6
3.3028 numeric | 5.1888 dB
1
112
6
3.3028 numeric | 5.1888 dB
1
64
6
3.3028 numeric | 5.1888 dB
1
39
6
3.3028 numeric | 5.1888 dB
1
18
6
3.3028 numeric | 5.1888 dB
1
12
10
3.126 numeric | 4.9499 dB
0.5
112
10
3.126 numeric | 4.9499 dB
0.5
64
10
3.126 numeric | 4.9499 dB
0.5
39
10
3.126 numeric | 4.9499 dB
0.5
18
10
3.126 numeric | 4.9499 dB
0.5
12
9
2.823 numeric | 4.5071 dB
0.5
112
9
2.823 numeric | 4.5071 dB
0.5
64
9
2.823 numeric | 4.5071 dB
0.5
39
9
2.823 numeric | 4.5071 dB
0.5
18
9
2.823 numeric | 4.5071 dB
0.5
12
5
2.7154 numeric | 4.3383 dB
1
120
5
2.7154 numeric | 4.3383 dB
1
112
5
2.7154 numeric | 4.3383 dB
1
64
5
2.7154 numeric | 4.3383 dB
1
56
5
2.7154 numeric | 4.3383 dB
1
39
5
2.7154 numeric | 4.3383 dB
1
32
5
2.7154 numeric | 4.3383 dB
1
18
5
2.7154 numeric | 4.3383 dB
1
18
5
2.7154 numeric | 4.3383 dB
1
12
5
2.7154 numeric | 4.3383 dB
1
9
8
2.519 numeric | 4.0123 dB
0.5
112
8
2.519 numeric | 4.0123 dB
0.5
64
8
2.519 numeric | 4.0123 dB
0.5
39
8
2.519 numeric | 4.0123 dB
0.5
18
8
2.519 numeric | 4.0123 dB
0.5
12
7
2.217 numeric | 3.4577 dB
0.5
112
7
2.217 numeric | 3.4577 dB
0.5
64
7
2.217 numeric | 3.4577 dB
0.5
39
7
2.217 numeric | 3.4577 dB
0.5
18
7
2.217 numeric | 3.4577 dB
0.5
12
4
2.1332 numeric | 3.2903 dB
1
120
4
2.1332 numeric | 3.2903 dB
1
112
4
2.1332 numeric | 3.2903 dB
1
64
4
2.1332 numeric | 3.2903 dB
1
56
4
2.1332 numeric | 3.2903 dB
1
39
4
2.1332 numeric | 3.2903 dB
1
32
4
2.1332 numeric | 3.2903 dB
1
18
4
2.1332 numeric | 3.2903 dB
1
18
4
2.1332 numeric | 3.2903 dB
1
12
4
2.1332 numeric | 3.2903 dB
1
9
6
1.913 numeric | 2.8171 dB
0.5
120
6
1.913 numeric | 2.8171 dB
0.5
112
6
1.913 numeric | 2.8171 dB
0.5
64
6
1.913 numeric | 2.8171 dB
0.5
39
6
1.913 numeric | 2.8171 dB
0.5
18
6
1.913 numeric | 2.8171 dB
0.5
12
5
1.612 numeric | 2.0737 dB
0.5
120
5
1.612 numeric | 2.0737 dB
0.5
112
5
1.612 numeric | 2.0737 dB
0.5
64
5
1.612 numeric | 2.0737 dB
0.5
56
5
1.612 numeric | 2.0737 dB
0.5
39
5
1.612 numeric | 2.0737 dB
0.5
32
5
1.612 numeric | 2.0737 dB
0.5
18
5
1.612 numeric | 2.0737 dB
0.5
18
5
1.612 numeric | 2.0737 dB
0.5
12
5
1.612 numeric | 2.0737 dB
0.5
9
3
1.5588 numeric | 1.9279 dB
1
112
3
1.5588 numeric | 1.9279 dB
1
80
3
1.5588 numeric | 1.9279 dB
1
64
3
1.5588 numeric | 1.9279 dB
1
56
3
1.5588 numeric | 1.9279 dB
1
39
3
1.5588 numeric | 1.9279 dB
1
32
3
1.5588 numeric | 1.9279 dB
1
18
3
1.5588 numeric | 1.9279 dB
1
18
3
1.5588 numeric | 1.9279 dB
1
12
3
1.5588 numeric | 1.9279 dB
1
9
4
1.307 numeric | 1.1628 dB
0.5
120
4
1.307 numeric | 1.1628 dB
0.5
112
4
1.307 numeric | 1.1628 dB
0.5
64
4
1.307 numeric | 1.1628 dB
0.5
56
4
1.307 numeric | 1.1628 dB
0.5
39
4
1.307 numeric | 1.1628 dB
0.5
32
4
1.307 numeric | 1.1628 dB
0.5
18
4
1.307 numeric | 1.1628 dB
0.5
18
4
1.307 numeric | 1.1628 dB
0.5
12
4
1.307 numeric | 1.1628 dB
0.5
9
3
1.012 numeric | 0.0518 dB
0.5
112
3
1.012 numeric | 0.0518 dB
0.5
80
3
1.012 numeric | 0.0518 dB
0.5
64
3
1.012 numeric | 0.0518 dB
0.5
56
3
1.012 numeric | 0.0518 dB
0.5
39
3
1.012 numeric | 0.0518 dB
0.5
32
3
1.012 numeric | 0.0518 dB
0.5
18
3
1.012 numeric | 0.0518 dB
0.5
18
3
1.012 numeric | 0.0518 dB
0.5
12
3
1.012 numeric | 0.0518 dB
0.5
9
2
0.9971 numeric | -0.0126 dB
1
80
2
0.9971 numeric | -0.0126 dB
1
80
2
0.9971 numeric | -0.0126 dB
1
64
2
0.9971 numeric | -0.0126 dB
1
56
2
0.9971 numeric | -0.0126 dB
1
39
2
0.9971 numeric | -0.0126 dB
1
32
2
0.9971 numeric | -0.0126 dB
1
18
2
0.9971 numeric | -0.0126 dB
1
18
2
0.9971 numeric | -0.0126 dB
1
12
2
0.9971 numeric | -0.0126 dB
1
9
2
0.702 numeric | -1.5366 dB
0.5
80
2
0.702 numeric | -1.5366 dB
0.5
80
2
0.702 numeric | -1.5366 dB
0.5
64
2
0.702 numeric | -1.5366 dB
0.5
56
2
0.702 numeric | -1.5366 dB
0.5
39
2
0.702 numeric | -1.5366 dB
0.5
32
2
0.702 numeric | -1.5366 dB
0.5
18
2
0.702 numeric | -1.5366 dB
0.5
18
2
0.702 numeric | -1.5366 dB
0.5
12
2
0.702 numeric | -1.5366 dB
0.5
9
1
0.4611 numeric | -3.3620 dB
1
40
1
0.4611 numeric | -3.3620 dB
1
40
1
0.4611 numeric | -3.3620 dB
1
32
1
0.4611 numeric | -3.3620 dB
1
12
1
0.4611 numeric | -3.3620 dB
1
9
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