Model 201

The WATTS MODEL 201 HIGHLY DIRECTIVE LOCALIZER SYSTEM provides final approach azimuth guidance information to a landing aircraft, enabling the pilot, or autopilot, to maintain the proper course during the approach and landing.  The Model 201 is engineered to provide Category III ILS signal quality for the most complex airport environments in the world and represents R&D in ILS antenna system design well ahead of today’s standards.

  • Substantially Reduces ILS Critical and Sensitive Areas
  • Provides Maximum Runway Capacity, Allowing Increased Airport Development and New Construction.
  • Modular Course Antenna – Adjustable Antenna Aperture
  • Frangible Design
  • Minimize Coaxial Cable and Low Tune-up Time – Adjustment by Trimming One Coaxial Cable
  • Three Configurations:
  1. Model 201 Wide-Aperture Slotted Cable Course Antenna:
    The narrow course beam produces Category III signal-in-space
    course structure quality and adequate signal levels to meet
    all FAA usable distance requirements.
  2. The 8-Element LPD Reduced Clearance-Sector Antenna Array:
    Provides limited azimuthal coverage with course roughness comparable
    to a 14-element array since energy is suppressed outside +/- 15 degrees
    in azimuth and meets usable distance.
  3. The Model 201-8 Two Frequency Localizer System:
    Combination of the Model 201 Wide-Aperture Slotted Cable Course
    Antenna Array with the 8-Element LPD Reduced Clearance-Sector Antenna
    Array meets all FAA Flight Inspection requirements.

AIRPORT EFFICIENCY AT ITS PEAK…………
CAT II/III INSTRUMENT LANDING SYSTEM
MODEL 201
WIDE APERTURE LOCALIZER ARRAY

ANOTHER TOUGH SITE SOLUTION BY:
WATTS ANTENNA COMPANY
70 North Plains Road – Suite H
The Plains, Ohio 45780-1156
USA – Manufacturing Facility
Phone: +1.740.797.9380; Fax: +1.740.797.9787
WWW.WATTSANTENNA.COM
EMAIL: INFO@WATTSANTENNA.COM

BENEFITS

  1. Designed to Interface with the Electronic Equipment of any Manufacturer
  2. Can be Configured to Provide a Narrow Beam Back-course
  3. Long Term Category II/III Performance – Minimize Future Downtime and
    Costs Associated with Periodic Upgrades of the ILS
  4. Premium Quality Approach Course
  5. The Smallest Critical and Sensitive Areas of any ILS Localizer
  6. Provides Significant Opportunity to Increase the Number of Flight Operations
    During IFR Conditions
  7. Provides Significant Opportunity to Promote New Taxiways and Greater Use
    of Existing Taxiways to Increase Flight Operations
  8. Provides Substantial Opportunities to Permit New Construction on and
    Around the Airport Property Without Degrading the ILS
  9. Increased Confidence that all Airborne Receivers will Provide the Same
    Indications on an Approach. i.e. Reduce Variations Between Flight
    Measurement Systems that Results from Multipath Signals
  10. Potential to Provide Efficient CAT II/III Operations with Super Jumbo Jets
    such as the Airbus A380
  11. Potential to Provide a Greater Density of ILS Localizer Systems and
    Minimize Channel Assignment Constraints
  12. Frangible Design – Thin Wall Fiberglass Tubing Construction
  13. Minimize Coaxial Cable Compared to Conventional Localizer Systems
  14. Reduced Tune-up Time
  15. Simplify Operating Frequency Changes

ILS CRITICAL AREA MODELING
CATEGORY II/III
SCENARIO — 747 AIRCRAFT PARALLEL TO THE RUNWAY
SOME SAID IT COULDN’T BE DONE…….WE DIDN’T LISTEN!

Typical 150 Feet Antenna Array Aperture (Course Only)

Watts 278 Feet Antenna Aperture (Course Only)

GREATER MOVEMENT OF AIRCRAFT WITHOUT DEGRADING THE ILS?
GREATER AIRPORT EFFICIENCY DURING POOR VISIBILITY?
Yes!
MORE AIRCRAFT OPERATIONS PER HOUR!

SPECIFICATIONS

COURSE ANTENNA (64 Slots)
Antenna Aperture 278 Feet (84.7 Meters)
3dB Beamwidth 2.65 Degrees Theoretical
Front-to-Back Ratio 0 to 20 dB (Adjustable with Reflecting Screen)
CSB Sidelobe Level Suppression = 27 dB or Greater
SBO Sidelobe Level Suppression > 27 dB, 31 dB Compared to Existing Systems
Course Width 3 to 4 Degrees (Adjustable)
Transmission Line 7/8 Air-Dielectric
System Air Pressure 5 PSI Nominal
CLEARANCE ARRAY (2 Types)
Antenna Aperture 50 Feet ( 15.3 Meters)
Azimuth Coverage +/- 15 to 20 Degrees
Clearance Array Type 1 8-Element LPD , No Back-Course
Clearance Array Type 2 8-Element Dipole, With Back-Course
Front-to-Back Ratio, Array Type 1, 25 dB or Greater
Front-to-Back Ratio, Array Type 2 0 to 20 dB (Adjustable with Reflecting Screen)
CSB Sidelobe Level Suppression > 30 dB Beyond 22 Degrees, Theoretical
SBO Sidelobe Level Suppression > 30 dB Beyond 22 Degrees, Theoretical
Centerline Power Separation
Course-to-Clearance
15 dB (Minimum)

OUR ADVANCED TECHNOLOGY PRODUCT LINE LEADS
THE INDUSTRY BY:

  1. Providing Substantial Increases in Airport Capacity
  2. Providing Precision Guidance in Difficult Airport Environment
  3. Facilitating Airport Growth Opportunities
  4. Simplifying Air Traffic Control Operations
  5. Improving Signal Quality
  6. Increasing Safety
  7. Reducing Aircraft Fuel Consumption
  8. Reducing Greenhouse Gas Emissions

Watts 2017 Product Brochure

Model 201 Downloadable Hi-Resolution Brochure