ORBIT FR Field Probes User Manual

Field Probes

Field Probes Overview

Aperture Field Probe systems are used to evaluate the extraneous signals
which exist in the location of the Device Under Test due to reflections, other
transmitting sources, etc.

The Aperture Field Probe can rest on a polarization positioner which moves on
a linear carriage, which is mounted on another polarization positioner. Thus a
circular area can be observed at any location in any desired polarization.

The carriage rotation is achieved by a standard polarization positioner, AL-560­1P, AL-760-1P, AL-1260-1P or AL-1760-1P according to series and carriage
size.

The linear slide is used for the radial motion.

The main purpose of the probe polarization positioner is to keep the probe in a
constant polarization by rotating in reverse direction to the Field Probe
polarization positioner. For example, if the probe is in vertical polarization at a
given position, and the Field Probe rotates 30°, then the probe itself rotates -30°
to retain the same vertical polarization. The probe polarization positioner can
also serve to sample the field at several polarizations at any given point.

It is recommended that the probe be mounted on the smallest polarization
positioner which complies with the probe's mechanical constraints (weight and
bending moment).

Options for both series include:
Rotary joint for the probe positioner

 RF cable installation
 Probe fixtures
 Replace the synchro transducer with Incremental rotary encoder. This option

is required when using AL-060-1P or AL-160-1P positioners

 Preparation and installation of absorbing material

Lightweight: AL-4607 Series
High Accuracy: AL-4608 Series

AL-4608-1

Field Probes

Lightweight Aperture Field Probe AL-4607 Series

The AL-4607-1 lightweight aperture field probe has two linear travel ranges: 54" or 108". The
model with 54" linear travel can be mounted on an AL-560-1P polarization positioner for a
maximum load of 20 lbs, or on an AL-760-1P for a maximum load of 50 lbs.

The model with 108" linear travel is mounted on the AL-760-1P for a maximum load of 20 lbs.

Options

 EN001 Replace synchro readout with rotary incremental encoder for all axes. Required

when ordering with AL-160-1

 PRB Probe holder
 RFC RF cable installation through Field Probe
 RJ12L Coaxial single-channel Rotary Joints, DC-12.4 GHz (including precision RF path, N-

type connector and mounting flange), for same or lower axis.

 RJ18L Coaxial single-channel rotary joints, DC-18 GHz (including precision RF path, SMA-

type connector and mounting flange) for same or lower axis.

 RJ40L Coaxial single-channel rotary joints, DC-40 GHz (including precision path, K-type

connector and mounting flange), for same or lower axis.

 RJ12U Coaxial single-channel rotary joints, DC-12.4 GHz (including precision RF path, N-

type connector and mounting flange), for upper Azimuth positioners.

 RJ18U Coaxial single-channel rotary joints, DC-18 GHz (including precision RF path, SMA

connector and mounting flange), for upper Azimuth positioners.

 RJ40U Coaxial single-channel rotary joints, DC-40 GHz (including precision RF path, K-type

connector and mounting flange), for upper Azimuth positioners.

AL-4607 Series

Al-4607-1 Lightweight Field Probe

Ordering Information

Supplied Accessories

Field Probes

Lightweight Aperture Field Probe AL-4607 Series (Cont’d)

Specifications:

AL-4607-1-560-54 AL-4607-1-760-54 AL-4607-1-760-108 AL-4607-1-1260-108

Travel

Polarization Positioner AL-560-1P AL-760-1P AL-760-1P AL-1260-1P

Max. Load

Carriage Bending Moment

Max. Carriage Speed

Carriage Motor hp 1/16 1/16 1/16 1/16

Backlash

Carriage Weight

Data Take-off Accuracy

Planarity

Deflection at max. Load

Repeatability

Probe Positioner 1 AL-160-1 1 AL-160-1P AL-160-1 1 AL-160-1 AL-260-1P 1

mm ±1,371.6 ±1,371.6 ±2,743,2 ±2,743,2
in ±54 ±54 ±108 ±108

kg 9 23 9 9
lbs 20 50 20 20
m-kg 5.5 8.3 5.5 5.5
ft-lbs 40 60 40 40
m/min 5 5 5 5
ft/min 15 15 15 15

mm 0.4 0.4 0.4 0.4
in 0.0016 0.0016 0.0016 0.0016
kg 96 96 125 125
lbs 210 210 275 275
mm ±0.5 ±0.5 ±1.0 ±1.0
in ±0.02 ±0.02 ±0.04 ±0.04
mm ±1.5 ±1.5 ±3.0 ±3.0
in ±0.06 ±0.06 ±0.12 ±0.12
mm ±1.5 ±1.5 ±3.0 ±3.0
in ±0.06 ±0.06 ±0.12 ±0.12
mm ±0.25 ±0.25 ±0.5 ±0.5

in ±0.01 ±0.01 ±0.02 ±0.02

AL-4607 Series

Dimensions:

AL-4607-1-560-54 AL-4607-1-760-54 AL-4607-1-760-108 AL-4607-1-1260-108

Outline Dimensions Drawing Number 11-2450 11-2450 11-2449 11-2449

A Length

B Radius

C Travel

D 1 Thickness

E Width

mm 3,600 3,600 6,400 6,400

in 141.7 141.7 252 252

mm 1,800 1,800 3,200 3,200

in 70.87 70.87 126 126

mm 1,372 1,372 2,743 2,743

in 54 54 108 108

mm 113 1 113 113 1 113 1

in 4.4 1 4.4 4.4 1 4.4 1

mm 160 160 160 160

in 6.3 6.3 6.3 6.3