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657
174-230MHz TV Panel Arrays
657, 658 Series

This series of panel antennas have been designed for three-sided arrays and provides a customized horizontally polarized coverage for single or multistation use in Band III. Model 657 has a nominal gain of 7dBd and the 658 has a nominal gain of 10dBd.
Construction from a thick-walled tube and solid steel bar gives a heavy-duty panel which is designed for operation in very harsh environments. This design also ensures ideal hot-dip galvanizing for optimum corrosion protection. Colours are available for aviation visibility and even further corrosion protection.
The coaxial feed system can be fully pressurized and features twin "O" ring seals on the feed point insulators. The panels are tolerant of light icing (radomes are available for use under heavy icing conditions down to -40 degrees C) and have a very low VSWR (typically less than 1.05:1) over the entire 174 - 230MHz band depending on the system configuration.
These panels are ideal array elements for a triangular mast with a 1.2m face and can provide omnidirectional patterns with <1 dB variation. By varying the number and positions of panels and feed amplitude/phase, patterns can be customized to optimize coverage over a given service area. The use of three panels around the structure offers significant cost and wind load reduction over four-sided arrangements.

FEATURES / BENEFITS

  • Suitable for single or dual channel use
  • Three-sided array design - lower cost
  • Cyclone rated
  • Rugged galvanized steel construction for maximum corrosion protection
  • Low wind load
  • Pressurizable coaxial feed
  • Horizontal polarization
  • Array design allows a variety of standard horizontal radiation patterns as well as customised patterns, contact RFS for details
  • Medium power, unpressurized version available
  • Temperature range -40 to +60 degrees C available
  • For detailed technical information use the external document link below.


657 and 658 Antenna Series showing 657 Panel Array

Technical features

Structure

Product LineAntenna TV
Product TypeBand III (High VHF) TV 657 Panel Arrays

Electrical Specifications

Frequency Range MHz174 - 230
Operating Frequency Ranges MHz174 - 202
202 - 230
PolarizationHorizontal
Nominal Gain (Mid-band) dBd7
Half Power Beamwidth Azimuth degrees77
Return Loss dB23
Power Rating kW3
4
Impedance (unbalanced) Ω50

Mechanical Specifications

Number of ChannelsMultichannel
Input Connector7-16 DIN
7/8" EIA Flange
Mounting (Standard) mm (in)4 x 12mm (4 x 1/2") bolts
Effective Area Front (full antenna) No Ice m² (ft²)0.40 (4.30)
Effective Area Side (full antenna) No Ice m² (ft²)0.50 (5.38)
Design Wind Speed km/h (mph)240 (150)
Pressurization Operational kPa (psi)10 - 25 (1.5 - 3.6) 7/8" EIA Version
Pressurization Test kPa (psi)100 (15) 7/8" EIA Version
Weight kg (lb)33 (73)

Material

Material - InsulatorsPTFE
Material - RadiatorsHot Dipped Galvanised steel
Material - Reflecting ScreenHot Dipped Galvanised steel


Radiation Pattern


657 Panel

External Document Links

Notes

Note 1 Power rating is limited by the input connector type. 3.0kW for 7-16 DIN, 4kW for 7/8" EIA