The CX2500/13.56 RF amplifier operates at a frequency of 13.56 MHz. The power source produces maximum transfer of power into a 50 ohm resistive load and is designed to withstand large deviations in load impedance without failure. The primary features of the CX2500 series are its solid-state design, small physical size and reliability.
CX2500 series power amplifiers can be supplied with internal frequency sources or may be driven from external frequency sources having a 50 ohm output and a digital drive level of 0-5 V.
The CX2500 series amplifier is constructed with three main sections DC power supply, RF power stage and control and interface. This section includes all of the filter capacitors, rectifiers and regulators as well as the three-phase 208 VAC power transformer. The bridge rectifiers are mounted on a water-cooled heatsink. These components are operated at about half of their rated outputs to insure the high reliability of this section. The RF section of the amplifier is mounted around the DC section. This section consists of the internal/external oscillator frequency control board (OCB), driver, two PA1250 power amplifiers on one water-cooled block, an RF combiner, and an output matching network/harmonic filter. The driver, power amplifier and combiner modules are mounted on water-cooled heatsinks. All components are used well below their dissipation ratings for long life and low maintenance operation. The control and interface section is mounted to the front panel assembly. On this assembly there is a 20 x 2 character florescent display, CX
microprossesor PCB, softkey input interface PCB and a CX interface PCB. The CX interface PCB consists of a remote interface, amplifier interface, local interface and low voltage dc power supplies.
A. Electrical Specifications
AC Input Voltage: 188-228VAC; no neutral; three phase with ground.
AC Line Frequency: 50/60Hz nominal; 49 to 61 Hz range.
AC Input Current: 15 amps maximum.
Output Characteristics:
4.1 0 to 2500W continuous forward power at the unit’s rear bulkhead RF connector into a 50ohm load.
4.2 The forward power out is to track the command setpoint for any load conditions where the reflected power is less than: 375W.
4.3 Accuracy/Regulation: +/- 3.0% of setpoint, from 10% to 100% max. output, as measured by either the actual output power and/or the forward analog read back signal
4.4 Linearity: +/- 2.0% deviation from a straight line for successive requested setpoint power increment changes, from 10% to 100% max. output, as measured by either the actual output power and/or the forward analog read back signal.
4.5 Short Term Stability: +/- 1.0% for any given output power setpoint during one continuous hour of output.
4.6 Long Term Stability: +/- 5.0% for any given output power setpoint during 3 years of continuous output.
4.7 Rise Time: less than 100ms; from leading edge of enable signal to 90% of power level requested.
4.8 Zero Setpoint: less than 1.0W actual output power and less than 1.0W read back power when setpoint signal is at zero or at a negative voltage.
4.9 Frequency stability: 13.56 MHz +/- 0.005%
4.10 Output Filtering: (for full power into 50 ohms)
Harmonic Signals: less than -30dBc Spurious Signals: less than -40dBc AM & FM Noise: less than -40dBc (@ 50 KHz offset)
Protection Features:
5.1 Mismatch Protection: Continuous operation into any impedance mismatch condition without damage or malfunction; forward power foldback shall occur within 500us if reflected power exceeds 375W.
5.2 AC Line Protection: A manually resettable circuit breaker on the rear panel opens upon overcurrent conditions.
5.3 RF Output Power Connection Interlock: A Hard-wired interlock that disables the input AC power contactor upon removal of either of the RF output cables.
5.4 Safety Interlock: Disables the input AC power contactor via either of the control I/O connection signals; open between Pins 10 & 23.
5.5 Over Temperature Fault: Output disabled on high internal temperature.
5.6 Control Signal Protection: Unit not to be damaged if a short circuit or up to 30 volts AC or DC is placed between any input signal, return signal, and ground.
Control Signals
6.1 Signal Input Impedance: 10K ohms, minimum.
6.2 Signal Input Isolation: 1000VAC minimum to the A/C supply line.
Rear Panel Electrical Connections
7.1 Input Power Connection: TBD
7.2 Output Power Connector: Type “N” female coaxial bulkhead connector.
7.3 Control I/O Connector: 25 pin sub miniature ”D” type (female) receptacle.
Control I/O Pinout & Signals (Refer to Figure CX INTERFACE).
Pins 1 & 14: DO, Max. RF power, Active = 2500 Watts forward.
Pins 2 & 15: AO, Ref Power Output: 0 to +10VDC = 0 to 2500W linear.
Pins 3 & 16: AO, Fwd Power Output: 0 to +10VDC = 0 to 2500W linear.
Pins 4 & 17: DI, RF Power Enable, Activated Enables RF output.
Pins 5 & 18: AI, Remote Setpoint Input: 0 to +10VDC = 0 to 2500W linear.
Pins 6 & 19: Unregulated DC output: 15 – 30 VDC.
Pins 7 & 20: DO, RF Power On Output, Active = RF ON.
Pins 9 & 22: DO, Indicates status of heatsink temperature, Active = HOT.
Pins 10 & 23: AC Interlock loop, Jump to enable AC power to unit
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