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Bob Groome
Account Manager, Western US Radio Market
Sacramento, CA

Region: US - AK, AS, AZ, CA, CO, GU, HI, ID, KS, MT, ND, NE, NM, NV, OK, OR, SD, TX, UT, WA, WY

Telephone: +1 (916) 681-4969
Cell: +1 (916) 705-0040
Fax: +1 (413) 683-6907
Email: bgroome@eriinc.com
Carl Davis
Account Manager, Eastern US Radio Market
Raleigh, NC

Region: US - AL, CT, DC, DE, FL, GA, MA, MD, ME, NC, NH, NJ, NY, PA, PR, RI, SC, VA, VI, VT, WV

Telephone: +1 (919) 381-5257
Fax: +1 (812) 925-4030
Email: cdavis@eriinc.com
Joe Meleski
Director of Domestic Sales

Region: US
Telephone: +1 (812) 925-6000
Fax: +1 (812) 925-4030
Email: Joe@eriinc.com
Paul R. Dadian
Account Manager, Central US Radio Market
West Chester, OH

Region: US - AR, IA, IL, IN, KY, LA, MI, MN, MO, MS, OH, TN, WI

Telephone: +1 (513) 847-1220
Cell: +1 (513) 200-2213
Fax: +1 (812) 925-4030
Email: pdadian@eriinc.com
Bill Ramos
Area Sales Director, Mexico and Latin America

Region: Mexico and Latin America
Telephone: +1 (480) 659-8381
Fax: +1 (812) 925-4030
Email: BRamos@eriinc.com
Jim Hauptstueck
Director of Global Channel Management/ Inside Sales
Chandler, IN

Region: Inside Sales, US, Asia Pacific
Telephone: +1 (812) 925-6000
Fax: +1 (812) 925-4030
Email: JHauptstueck@eriinc.com
David White
Senior Sales Engineer
Chandler, IN

Region: Inside Sales
Telephone: +1 (812) 925-6000 ext 295
Fax: +1 (812) 925-4030
Email: DWhite@eriinc.com
Denise Ruffin
Sales Engineer
Chandler, IN

Region: Inside Sales
Telephone: +1 (812) 925-6000
Fax: +1 (812) 925-4030
Email: DRuffin@eriinc.com
Stephen Rabin
Area Sales Director, Europe, Africa, and Middle East

Region: Europe, Africa, and Middle East
Telephone: +44 (0)20 8360 0480
Fax: +44 (0)87 0199 2091
Email: SRabin@eriinc.com
Catalog > Antennas > FM Antennas > ROTOTILLER Rotofiller Series

ROTOTILLER ® Rotofiller Series Circularly Polarized FM Antenna

Characteristics

Product Line:ROTOTILLER
Product Series:Rotofiller 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:1.15:1, maximum with field tuning
Maximum Power Rating:64 kW

ERI’s Rotofiller™ Series ROTOTILLER® FM antenna utilizes variable bay to bay spacing to further reduce downward radiation. As compared with a standard X Series half wave spaced antenna. The Rotofiller series provides reduced vertical plane radiation which helps to comply with FCC regulations for downward radiation. This vertical plane sidelobe reduction to less than -30 dB lessens interference with ground level studio and telecommunications systems. In addition, the possibility of ground reflections that can cause mulitpath interference is reduced. The Rotofiller™ puts radiation where you need it— in the main beam.

The Rotofiller Series ROTOTILLER FM Antenna is available in low, medium, and super high power models. Higher power gain (without sidelobe reduction) can be obtained by using ERI’s standard half wave antennas.

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

Ordering Information

Type Number Definition  
a - b c d e - f - g - h  
a 
 Model: SHPXF | MPX | LPXF 
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:  SHPXF-4AC6 
Description:  ERI Model SHPXF ROTOTILLER FM Antenna, four bay, 4 1/8 inch interbay line, center fed, omnidirectional azimuth pattern, 6-1/8 inch RF input. 

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); Second null fill not available for LP 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.

Related Publications

ROTOTILLER® Rotofiller™ Series Circularly Polarized FM Radio Antenna

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

Topics Include: Antennas

(Type: Brochure; Publication Number: 20090316003_AEN; Language Code: EN; Revision: 01)


Type Number Number of
Bays		 Power Gain,
Numeric | dB		 Bay Spacing,
Wave Lengths		 Power Rating, kW
12
3.1113 numeric | 4.9294 dB
64
12
3.1113 numeric | 4.9294 dB
39
12
3.1113 numeric | 4.9294 dB
18
12
3.1113 numeric | 4.9294 dB
12
10
2.5997 numeric | 4.1492 dB
64
10
2.5997 numeric | 4.1492 dB
39
10
2.5997 numeric | 4.1492 dB
18
10
2.5997 numeric | 4.1492 dB
12
8
2.1129 numeric | 3.2488 dB
64
8
2.1129 numeric | 3.2488 dB
39
8
2.1129 numeric | 3.2488 dB
18
8
2.1129 numeric | 3.2488 dB
12
6
1.5997 numeric | 2.0404 dB
64
6
1.5997 numeric | 2.0404 dB
39
6
1.5997 numeric | 2.0404 dB
18
6
1.5997 numeric | 2.0404 dB
12
4
1.1294 numeric | 0.5285 dB
64
4
1.1294 numeric | 0.5285 dB
39
4
1.1294 numeric | 0.5285 dB
18
4
1.1294 numeric | 0.5285 dB
12
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