From a PDF: "6.10 TASKER SYSTEMS
Tasker Systems, a division of Whittaker Corporation of Los Angeles,
California, produces RVR instrumentation. Recently Tasker Systems design[ed] a new
system, the RVR 500 which supersedes previous systems. They also have designed
modification kits for the FAA/NBS transmissometers.
6.10.1 RVR SYSTEM MODEL 400
Although the FAA has many RVR 400 systems currently deployed, and they
are still available from Tasker on a special order basis, current and future procurements
are for the RVR 500 systems.
The RVR 400 System provides functions similar to those of the RVR 500
System detailed in the next section. The basis differences are that the RVR 400 is
limited in table selection by having only three day tables and three night tables,
there is no continuous failure monitoring in the 400 systems, and update cycle is
fixed at 48 sec. These units consist of the following:
RVR 400/1 Signal Data Converter
RVR 400/2 Power Supply and Control Unit
RVR400/4P Remote Display Programmer
RVR 400/5 Runway Light Setting Unit
RVR 400/10 Transmissometer System
RVR 400/12T Tower for Transmissometer System.
6-26 6.10.2 RVR SYSTEM MODEL 500
The RVR Series (References 39 and 40) provides improved reliability,
has reduced size and weight, uses integrated circuits (IC), and at the same time
performs more functions that the older RVR 400 equipment.
The new series consists of the following:
RVR 500/1 Computer Main Frame
RVR 500/2 Signal Data Converter Module
RVR 500/3 Ambient Light Sensor
RVR 500/4P Remote Display Programmer
RVR 500/5 Runway Light Setting Unit
RVR 500/10 Transmissometer Systems
RVR 500/12TM Support Tower Assembly, Modified.
For price information, see Subsection 8.2.4.
Some of the new units are detailed below. "
Alex