ORBIT FR Field Probes User Manual
Page 4

Field Probes
High-Precision Aperture Field Probe
AL-4608 Series
The AL-4608-1 high-precision aperture field probe has two linear travel ranges: 48" or 100". These 
high precision models are extremely accurate and have very low deflection under maximum load. 
 
The models with 48" linear travel can be mounted on an AL-760-1P polarization positioner for 
maximum load of 50 lbs, or on AL-1260-1P for maximum load of 100 lbs. 
 
The models with 100" linear travel can be mounted on an AL-1260-1P polarization positioner for a 
maximum load of 50 lbs, or on an AL-1760-1P for a maximum load of 100 lbs. 
 
Options 
 
 ABI01 Installation of absorbing material. 
 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.
Ordering Information
Supplied Accessories
Al-4608-1 High-Precision Aperture Field Probe
