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Catalog > Antennas > FM Antennas > ROTOTILLER H Series

ROTOTILLER ® H Series Horizontally Polarized FM Antenna

Characteristics

Product Line:ROTOTILLER
Product Series:H Series
Frequency Range:88 - 108 MHz
Multiplexed Versions Available:No
Broadband Applications:No
Polarization:Horizontal
Azimuth:± 2 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

Notes:The VSWR specifications apply over a frequency ± 200 kHz from the tuning point of the antenna. Where deicing heaters are not used, this tuning point is customarily set 200 kHz above the station operating frequency to provide improved performance under icing conditions. Parasitic elements tend to reduce the VSWR bandwidth of the antenna.

The H series, horizontally polarized antennas will afford broadcasters all the advantages of ERI’s standard internal feed and fully pressured design, plus higher antenna gains and increased omnidirectional pattern characteristics.

Horizontal polarization only allows station owners to choose between circular polarization or increased antenna gain to achieve optimum market penetration. Maximum allowable ERP is maintained while reducing the required transmitter power and minimizing cost.

The H Series antenna can also be combined with the P-300 series (vertical only) antenna to achieve custom horizontal to vertical component ratios. This technique can be useful in reducing the problems associated with multi-path in mountainous terrain. The antenna’s rugged construction and resistance to the effects of radial ice make this combination unbeatable.

Both antennas are constructed of large diameter copper tubing, brass fittings and TIG welding. The antennas operate in a totally pressurized environment with all welded feed point connections. These features contribute to the superior power handling capabilities, excellent bandwidth and durability of the system. The antenna pattern is ± 2 dB when mounted on a Lambda system or on a small diameter antenna pole. Side mounting the antenna on a typical tower structure will affect the azimuth pattern. ERI offers pattern measurements and optimization to improve the circularity of the antenna system.

Features/Benefits

  • Low VSWR, Superior VSWR Band Width, Minimal weather related VWSR problems
  • Internal feed, Fully pressurized, Welded feed connections, Series fed radiation elements
  • High input power capacity
  • Modular construction facilitates easy installation and repair, Custom modifications are available
  • Rugged brass construction - TIG welding, Stainless steel support brackets and hardware, Corrosion resistant construction
  • Deicing heaters not normally required for ice radial less than 1/2 inch

Ordering Information

Type Number Definition  
SHP-H - a b c d - e  
a 
 Number of Bays 
b 
 Interbay Line Size: A = 3 1/8 inch | B = 4 1/8 inch | C = 6 1/8 inch 
c 
 Input Feed Configuration: E = End Fed | C = Center fed for even number of bays, off center fed for odd number of bays 
d 
 RF Input Size: Blank = 3 1/8 inch | 6 = 6 1/8 inch 
e 
 Design Note 1: Blank = Omnidirectional | DA = Directional Azimuth Pattern 
Example:  SHP-H-2AC 
Description:  ERI Model SHP-H ROTOTILLER FM Antenna, two bay, 3 1/8 inch interbay line, center fed. 

Options*

  • Anti-Rotation Brackets
  • Quarter wave stub
  • Beam tilt (center fed antennas only)
  • First null fill (center fed antennas only)
  • Second null fill (center fed antennas only)
  • Radomes
  • 600 W/ 220 V Deicers
  • 300 W/ 220 V Deicers Stem heaters
  • Teflon coating
  • 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® H Series Horizontally Polarized FM Radio Antenna

ROTOTILLER® H Series Horizontally Polarized FM Radio Antenna Brochure > Download File

Topics Include: Antennas

(Type: Brochure; Publication Number: 20090317002_AEN; Language Code: EN; Revision: 01)


Type Number Number of
Bays		 Power Gain,
Numeric | dB		 Bay Spacing,
Wave Lengths		 Power Rating, kW
12
13.725 numeric | 11.3751 dB
1
112
12
13.725 numeric | 11.3751 dB
1
64
12
13.725 numeric | 11.3751 dB
1
39
11
12.527 numeric | 10.9785 dB
1
112
11
12.527 numeric | 10.9785 dB
1
64
11
12.527 numeric | 10.9785 dB
1
39
10
11.33 numeric | 10.5423 dB
1
112
10
11.33 numeric | 10.5423 dB
1
64
10
11.33 numeric | 10.5423 dB
1
39
9
10.137 numeric | 10.0591 dB
1
112
9
10.137 numeric | 10.0591 dB
1
64
9
10.137 numeric | 10.0591 dB
1
39
8
8.947 numeric | 9.5168 dB
1
112
8
8.947 numeric | 9.5168 dB
1
64
8
8.947 numeric | 9.5168 dB
1
39
7
7.761 numeric | 8.8992 dB
1
112
7
7.761 numeric | 8.8992 dB
1
64
7
7.761 numeric | 8.8992 dB
1
39
6
6.581 numeric | 8.1829 dB
1
120
6
6.581 numeric | 8.1829 dB
1
112
6
6.581 numeric | 8.1829 dB
1
64
6
6.581 numeric | 8.1829 dB
1
39
5
5.408 numeric | 7.3304 dB
1
120
5
5.408 numeric | 7.3304 dB
1
112
5
5.408 numeric | 7.3304 dB
1
112
5
5.408 numeric | 7.3304 dB
1
64
5
5.408 numeric | 7.3304 dB
1
39
5
5.408 numeric | 7.3304 dB
1
32
4
4.246 numeric | 6.2798 dB
1
120
4
4.246 numeric | 6.2798 dB
1
112
4
4.246 numeric | 6.2798 dB
1
112
4
4.246 numeric | 6.2798 dB
1
64
4
4.246 numeric | 6.2798 dB
1
39
4
4.246 numeric | 6.2798 dB
1
32
3
3.1 numeric | 4.9136 dB
1
112
3
3.1 numeric | 4.9136 dB
1
112
3
3.1 numeric | 4.9136 dB
1
64
3
3.1 numeric | 4.9136 dB
1
56
3
3.1 numeric | 4.9136 dB
1
39
3
3.1 numeric | 4.9136 dB
1
32
2
1.981 numeric | 2.9688 dB
1
80
2
1.981 numeric | 2.9688 dB
1
80
2
1.981 numeric | 2.9688 dB
1
64
2
1.981 numeric | 2.9688 dB
1
56
2
1.981 numeric | 2.9688 dB
1
39
2
1.981 numeric | 2.9688 dB
1
32
1
0.914 numeric | -0.3905 dB
1
40
1
0.914 numeric | -0.3905 dB
1
40
1
0.914 numeric | -0.3905 dB
1
32
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