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MQH0XX-YYDM-ZZZ-2S RF Driver product image

MQH0XX-YYDM-ZZZ-2S

With an operating frequency of 24–110 MHz, a 2-channel 100 watts output into a 50-ohm load, and analog and digital modulation.

Full Product Description
Operating frequency:
24 MHz, 27.12 MHz, 40.68 MHz, 68 MHz, 80 MHz
RF frequency:
24.00 MHz, 27.12 MHz, 40.68 MHz, 68.00 MHz, 80.00 MHz ± 0.01%
RF output power per channel:
Nom: 50 W for 24, 27, and 41 MHz units, adjustable from 12 to 50 watts.*, Nom: 25 W for 68 and 80 MHz unit, adjustable from 12 to 25 watts. *
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Product description

This module is a high-power RF driver, designed to drive a Q-Switch.

The driver has two digital modulation inputs: fixed and variable. These controls allow the customer to issue a pulse command of fixed pulse width, the duration determined by the driver's pulse width control, settable by the customer, or issue a variable pulse command, the duration determined by the input signal’s pulse width.

The output power is controlled by the analog input, where the mode of operation is defined by ZZZ = A05 normal analog mode, or R05 analog switched to full RF mode or a triggered RF Ramp Down mode where ZZZ = FPS first pulse suppression mode or PPK pre-pulse kill mode. The choices of Frequency (XX), Output Power (YY), and Power Control (ZZZ) options are "Factory Set" when ordered.

This RF driver requires forced air cooling.

Key features

  • 24, 27.12, 40.68, 68, 80, or 110 MHz RF frequency (XXX)
  • 0.01% quartz stabilized
  • Up to 100 W RF power output (YY)
  • Analogue Modulation or Triggered RF Ramp Down Mode (ZZZ)
  • Up to 100 kHz pulse rate
  • Fault Protection on Low Power, High Power, and High VSWR

Specifications

NameValue
Operating frequency24 MHz, 27.12 MHz, 40.68 MHz, 68 MHz, 80 MHz
Number of channels2 (RF power split from one oscillator)
RF frequency24.00 MHz, 27.12 MHz, 40.68 MHz, 68.00 MHz, 80.00 MHz ± 0.01%
Spurious levelsMax: -50 dBc
Harmonic distortionMax: -30 dBc
Digital inputsModulation common to both outputs., Fixed mod in: TTL levels, triggered on rising edge. pulse width applied >50 ns, Variable mod in: TTL levels, TTL HIGH = RF off
Extinction ratioMin: 35 dB
Rise/fall timeMax: 500 ns (10% to 90%), Max: 100 ns (90% to 10%)
Modulation repetition rates1 Hz to 100 kHz for fixed modulation, DC to 100 kHz for variable modulation
Fixed modulation output pulse width adjustment range1 to 14 λs, Customer Adjustable
RF output power per channelNom: 50 W for 24, 27, and 41 MHz units, adjustable from 12 to 50 watts.*, Nom: 25 W for 68 and 80 MHz unit, adjustable from 12 to 25 watts. *
Output impedanceNom: 50 Ω
Shutter output0.3 sec delay. Opens on fault. Capable of sinking max: 1 A at 28 V.
Supply voltage+28 VDC ± 1%
Supply current6.5 A for 25 W /ch units, 9.0 A for 50 W /ch units
Operating temperature+10°C to +55°C
Air flow through heat sink> 36 CFM (> 17 litres / second) @ 25°C

* Both outputs must have 50 Ω load

Available pulse control optionsZZZMode
Pulse control mode is "Factory set when ordered":FPSFirst pulse suppression
PPKPre pulse kill
A05Analog control
R05RF switched to analog control
___Digital modulation only
Maximum ratings
Supply voltageMax: 30 V DC
Power outputNo DC feedback allowed
Storage temperature:-20°C to +85°C
Connectors and mechanical
RF output connectorBNC Female
Power supply connectionsVccSolder Post
ReturnGround Lug

25pin D-Sub connector pinout

Located on front panel.

Pin assignment
Pin 1+5V+5V output for external fault indicators, 75 mA availablePin 12MOD IN ANALOGControls the output power level in A05 and R05 models
Pin 2-3NCNo connectionPin 13FAULT RESETPulse LOW to reset the driver from a fault condition. This line should not be held LOW or it will defeat some of the fault conditions
Pin 4THERM RTNGround – to be used as a return for Both THERM and THERM 2Pin 14FPS TRGTriggers a suppression pulse on a RISING edge
Pin 5THERM 2Thermostat connection – driver enters a fault condition unless this is shorted to groundPin 15MOD IN FIXEDTurns the driver off for the duration set by the pulse width control
Pin 6THERMThermostat connection – driver enters a fault condition unless this is shorted to groundPin 16MOD IN VARIABLETurns the driver off while this input is HIGH
Pin 7DRV TEMPNormally HIGH, goes LOW when the driver is in an overheat faultPin17SYNC OUTOutputs a signal synchronized to the modulation output
Pin 8QS TEMPNormally HIGH, goes LOW when no short present on THERMPin 18-19NCNo connection
Pin 9HVSWRHigh VSWR fault, normally HIGH, goes LOW during faultPin 20SHUTTER0.3 sec delay. Opens on fault. Capable of sinking 1 amps at 28 volts maximum
Pin 10LPLow RF Power indicator, normally HIGH, goes LOW while driver output is below the Low RF Power thresholdPin 21-24NCNo connection.
Pin 11HPHigh RF Power fault, normally HIGH, goes LOW during faultPin 25GNDGround
IndicatorsLocated on front panel
PowerPower Indicator – The module has 28V applied on the DC connector
Low PowerFaults after 0.3 second, power below LP Set Point. Resets on power adjusted above Set Point
High PowerFaults when power above HP Set Point. Reset required after removing fault
High VSWRFaults when reflected power above VSWR Set Point. Reset required after removing fault
QS TempFaults on open Thermostat. Resets on closed Thermostat. (Q-Switch below set temperature)
DRV Temp DriverThe internal temperature of the module has reached 60C. The driver will remain in this fault condition until it cools down
AdjustmentsLocated inside unit through holes in module top cover
RF Power Level AdjustmentAdjusts the output RF Power.
LP Set PointAdjusts the minimum power threshold. If the module’s output goes below this set value, the low power warning light will turn on, but the driver will continue to output power. This is a warning, not a true fault condition.
HP Set PointAdjusts the maximum power threshold for the module. If the output rises above this threshold, the module will cease output until it is reset.
VSWR Set PointAdjusts the module’s tolerance for a mismatched load connected to RF Out. If a mismatch is detected, the driver will cease outputting power until reset.
Pulse WidthAdjusts the length of time the driver outputs no RF energy after receiving a trigger. 1µs to 14µs.

The following adjustment is not used on units configured with FPS or PPK:

ThresholdSets the point below which the analog voltage is ignored and the system output is shut off.

The following adjustments are not used on units configured with Analog Input (A05, R05):

FPS StartAdjusts the initial power level of the first pulse
FPS SlopeAdjusts how quickly the RF pulses return to their normal level after the FPS has been triggered. 20 µs to 300 µs
FPS WindowAdjusts the duration of the suppression pulse cycle. 20 µs to 300 µs

Order code

XX = 24, 27, 41, 68, or 80 where RF Frequency = 24.00, 27.12, 40.68, 68.00, 80.00 MHz ± 0.01%.

YY = 50 W nominal for 24, 27, and 41MHz units, adjustable from 12 to 25 watts.

ZZZ = Mode (see table)