Nautel XR6 Preinstallation Manual

Nautel XR6 Preinstallation Manual Manual pdf 54 page image

XR6/XR3 Pre-installation Manual Control and monitoringPage 6-12 Issue 3.0 2009-07-15Remote performance monitoringThe transmitter provides outputs that let you monitor RF performance. They include dc voltages thatrepresent the forward power level, the reflected power level, the B+ voltage and the dc current. Inaddition, a true RF sample of the RF output voltage waveform is available for external monitoring.These outputs are provided on the remote interface PWB.Analog samplesSample voltages, in the range of 0 to 4 V are provided for the following system parameters:• J2-1: Fwd Power• J2-3: Refld Power• J2-5: B+ Voltage• J2-7: Dc Current• J8: RF MonitorForward power level. A buffered dc voltage that reports the forward power level on J2-1. Thisvoltage is a pure square law function and will be 3.9 ± 0.5 V when the forward power is 6.5 kW (XR6)or 2.8 ± 0.5 V when the forward power is 3.3 kW (XR3). The monitoring circuit’s impedance must begreater than 1,000 ohms.Reflected power level. A buffered dc voltage that reports the reflected power level on J2-3. Thisvoltage is a pure square law function and will be 3.9 ± 0.5 V when the reflected power is 960 W(XR6) or 2.8 ± 0.5 V when the reflected power is 480 W (XR3). The monitoring circuit’s impedancemust be greater than 1,000 ohms.B+ volts. A buffered dc voltage on J2-5 that is directly proportional to the dc voltage from the maindc power supply. This voltage will be 3.0 V when the dc voltage being applied to the RF stage is312 V. The monitoring circuit impedance must be greater than 1,000 ohms.Dc Current. A buffered dc voltage on J2-7 that reports the dc current level of the main B+ powersupply. The output is 3.0 ± 0.5 V with a dc current of 40 A.