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618 Series
174-240MHz Sidemount DAB/TV Dipoles

PRODUCT DESCRIPTION

These vertically polarized antennas for TV and DAB broadcasting applications are intended for use where low wind loadings are required. They are designed to be side-mounted to a tower leg or pole and optional mounting brackets are available for this purpose.
The 618 series are fabricated from stainless steel and will handle up to 4kW input power per bay for standard models. Beam tilt and null fill can be provided on request.
Radomes are available for the 618 series if required.
Multiple element arrays are supplied as a complete package including power dividers and distribution cables. An optional input tuner ensures optimum VSWR performance after installation as it enables the effects of tower steelwork to be eliminated.
The 618 series can be arrayed with up to 6 or more bays as required.
Horizontal radiation patterns can be modified on the RFS antenna test range if required, by adjusting the spacing between the antenna and tower.

FEATURES / BENEFITS

  • Rugged construction for maximum corrosion protection
  • Broadband operation
  • Multi-channel use if required
  • Optional pressurization
  • Low wind load to minimize tower or mast costs
  • Vertical polarization
  • Temperature range -40 to +60 degrees C available.

TECHNICAL FEATURES

Details 

Product Type   Band III (High VHF) TV/DAB Panel Array 618

Electrical Specifications 

Antenna Type   Broadband VHF Dipole Antenna
Operating Frequency Range MHz 174-240
Polarization   Vertical
Azimuth Radiation Pattern   Omnioid
Impedance Ohms  50 

Mechanical Specifications 

Pressurization Operational kPa (psi) 10 to 25 (1.4-3.6)
Pressurization Test kPa (psi) 100 (15)

Model Number Specifications 

Antenna Model   618-1 618-2 618-3 618-4 618-6
Number of Bays   1 2 3 4 6
Nominal Gain (Mid-band) dBd 0 3 4.7 6 7.9
Azimuth Radiation Pattern [note 1] Omnidirectional +3dB
Return Loss dB Typically 20 over 50MHz
30 single channel, field tunable
Power Rating kW [note 2] 4 8 12 16 24
Input Connector   7-16 DIN
7/8" EIA Flange
7/8" EIA Flange
1-5/8" EIA Flange
Dimensions (Height or Length) cm (in) 69.5 (27.4) typical 210 (82.6) 320 (126) 460 (181) 769.5 (303) typical
Dimensions (Width) cm (in) 6 (2.4)
Dimensions (Depth) cm (in) 100.8 (39.7)
Mounting (Standard) mm (in) Clamping Dia. 43 - 76 (1.7 - 3)
Mounting Type   Side
Effective Area Front (Full Antenna) No Ice

m2 (ft2)
[note 3]

0.11 (1.18) 0.22 (2.37) 0.33 (3.55) 0.44 (4.74) 0.66 (7.10)
Effective Area Power Divider m2 (ft2) [note 4] 0.09 (0.97)
[note 3]
0.13 (1.4) [note 3] 0.13 (1.4) [note 3] 0.25 (2.7) [note 3]
Effective Area Comment    [notes 3, 4, 5] Note 3 Connecting cables are not included in calculations - 0.03m2 per meter length should be allowed.
Wind Load@ 50 m/s Front kN (lb) 0.13 (30) 0.26 (60) 0.39 (90) 0.52 (120) 0.78 (180)
Wind Load Comment   [note 5] Note 4 Power divider included and considered adjacent to antennas.
Note 5 Calculated in accordance with AS1170-1989, Part 2:" SAA Loading Code - Wind Forces".
Weight kg (lb) 8 (18) 30 (66) 45 (99) 65 (143) 105 (231)

External Document Links

Notes

Note 1 When antenna is mounted on a mast/tower with a face width of less than 150mm.
Note 2 Input power is limited to 5 kW maximum if a 7/8" connector is used.
Note 3 Connecting cables are not included in calculations - 0.03 metres squared per metre length should be allowed.
Note 4 Power divider included and considered adjacent to antennas.
Note 5 Calculated in accordance with AS1170-1989, Part 2: "SAA Loading Code - Wind Forces".