Varian VJW-2722H Remote Control Unit 010002850-01 Microwave Satcom 19" 2U

Varian VJW-2722H Remote Control Unit 010002850-01 Microwave Satcom 19" 2U

The Varian VJW-2722H is a 2U 19-inch rackmount remote control unit built by Varian's Microwave Equipment Division in Santa Clara, California. It is designed to provide remote monitoring and control of Varian microwave amplifier systems — most likely traveling wave tube (TWT) amplifier chains used in satellite communications (satcom) and microwave transmission systems. The front panel includes a multi-digit LED display for RF power output, discrete controls for RF drive and power limits, high-voltage sequencing, heater time delay, and Auto/Manual/Local/Remote mode selection, along with fault and alarm indicator LEDs and an Emergency Off button.

Specifications & What's Included

• Manufacturer: Varian Microwave Equipment Division, Santa Clara, CA
• Model: VJW-2722H
• Part Number: 010002850-01 (label reads 01002850-00)
• Form Factor: 2U, 19" rackmount
• Front Panel Display: Multi-digit LED display — RF Power Output (Watts, Peak, dBW selectable)
• RF Power Controls: Watts / Peak / dBW mode select buttons; Low Limit and High Limit adjust; RF Drive Adj rotary knob
• High Voltage Controls: Off/Stdby and On pushbuttons with LED status indicators
• Heater / Sequencing: Heater Time Delay On button with LED indicator
• Mode Selection: Auto, Manual, Local, Remote pushbuttons with LED indicators
• Fault Indicators: Sum Fault, Ext Intlk (external interlock) — red LED indicators
• Alarm Indicators: Hi RF, Lo RF — red LED indicators
• Additional Controls: Reset, LED Test, Aux
• Emergency Control: Large red Emergency Off pushbutton (front panel)
• Rear Connectors: Two multi-pin D-sub style connectors for system interface cabling
• Country of Manufacture: USA
• Included: Unit only; no interface cables or accessories included

Applications

The Varian VJW-2722H was designed as a system-level remote control and monitoring interface for Varian microwave power amplifier equipment, most commonly traveling wave tube (TWT) amplifiers used in ground-based satellite uplink and microwave relay stations. TWT amplifiers require careful sequencing of heater warm-up and high-voltage application to avoid damage to the tube — a process this controller manages through its Heater Time Delay, High Voltage Off/Stdby/On, and Auto/Manual sequencing functions. The RF power output metering (Watts, Peak, dBW) and limit controls allow operators to set and monitor transmitter output levels, while the fault and alarm indicators (Sum Fault, External Interlock, Hi RF, Lo RF) provide real-time status for automated or attended station operation. Local/Remote mode switching allows the unit to be operated either from the front panel or from a remote control system. This type of satcom ground equipment was widely used in C-band and Ku-band earth station facilities from the 1970s through the 1990s and remains relevant wherever legacy Varian TWT amplifier systems are still in service.