ORBIT FR DBDR User Manual

MEDIUM & HEAVY DUTYDBDR SERIES

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Model Towers – DBDR:
Dielectric Belt-Driven,
Medium & Heavy Duty

DBDR-MD Shown with absorber
platter (Opt. 003)

➊ APPLICATIONS

• Medium-directivity Antenna Testing

• Far-Field or Spherical Near-Field

Applications

• Indoor Use

➋ PRODUCT HIGHTLIGHTS

• Low Electromagnetic Profi le for Small

Broad-Beam Antennas

• Interchangeable AUT Foam Bracket –

See Options Table

• Compatible with Rotary Positioners

(Support Wiring Required)

128

DBDR-MD Shown with lower positioner and triangular base plate
(Opt. 002)

The Dielectric Belt Driven Rotator (DBDR) model tower series is a lower-scattering alternative to
conventional metal towers with a roll axis. They are generally used for omni-directional antenna
measurements and are available in two capacity categories: medium and heavy duty.

The primary components include an integrated gearhead roll positioner, mast and a ma­nual linear offset slide, which allows users to position the AUT’s phase center over the lower
azimuth axis. The base plate of the DBDR assembly provides a convenient interface to
the specifi ed lower positioner. The DBDR series is available in either encoder or synchro
format. Typical axis geometry confi gurations include Roll/AZ.

supplied accessories

technical notes

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CD-ROM Documentation Set:

 User Manual (Installation, Setup, Operation & Maintenance)

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Cables:

 Cable Carrier
 Interconnect Cable for Connection to Lower Positioner

optional accessories

 Lower Positioner

options

 Option 001

 Option 002

• Foam Bracket w/ Interface

Plate, Up to 4.4 lbs (2 kg)

• Portable Triangular Base Plate

(Increases Overall Height)

 1 Model tower height is defi ned as the distance from

the base of the offset slide to the center of the roll axis.

 2 The lower positioner may require electrical wiring and/

or an RF path to support the model tower. Options are
available for the lower positioner, including EX002, SR,
and RJ. Lower positioner purchased separately.

 3 All accuracy data is based on no-load conditions.

Contact ORBIT/FR for accuracy under load conditions.

 4 Roll axis is equipped with adjustable limit switches

capable of approx 20° to 900° total travel. When rotary
joint options are specifi ed, limit switches remain but
are electrically disabled. Roll axis is factory-set at 400°
(± 200°).

 5 Rotary joint options may alter the original physical

profi le of the roll axis stage. Consult ORBIT/FR.

 6 Verify model tower’s maximum swing radius

(G - clearance to absorber) when specifying this
product for use inside an anechoic chamber.

 7 Dimensions may vary depending on fi nal confi guration.

 Option 003

• Absorber Platter

ORDERING INFORMATION

• Build your confi guration using the ordering example below.

DBDR MD 21 60

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Basic Model

Tower Series

Capacity:

MD - Medium

HD - Heavy

> Model Towers

Linear Offset

Slide Travel (in)

Total Roll-to-Base
Height (in or mm)

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