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MQH0XX-YYDM-ZZZ RF Driver product image


With an operating frequency of 24–110 MHz, a 100 W 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, 27.12, 40.68, 68.00, 80.00 MHz ± 0.01%
RF output power:
Adjustable from 25 to 100 W, Nom: 50 W for 80 MHz units, Adjustable from 20 to 50 W.
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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


Operating Frequency24 MHz, 27.12 MHz, 40.68 MHz, 68 MHz, 80 MHz
RF frequency24.00, 27.12, 40.68, 68.00, 80.00 MHz ± 0.01%
Spurious levelsMax: -50 dBc
Harmonic distortionMax: -30 dBc
Digital inputFixed 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 µs, Customer Adjustable
FPS trigger / Analog inputUnits configured with FPS, PPK: TTL levels, Triggered on TTL rising edge. Units configured with A05, R05: 0 to 5 V analog.
RF output powerAdjustable from 25 to 100 W, Nom: 50 W for 80 MHz units, Adjustable from 20 to 50 W.
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 50 W units, 9.0 A for 100 W units
Operating temperature+10°C to +55°C
Air flow through heat sink> 36 CFM (> 17 litres / second) @ 25°C

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 available.Pin 12MOD IN ANALOGControls the output power level in A05 and R05 models
Pin 2-3NCNo connection.Pin 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 THERM.Pin 14FPS TRGTriggers a suppression pulse on a RISING edge.
Pin 5NCNo connection.Pin 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 ground.Pin 16MOD IN VARIABLETurns the driver off while this input is HIGH.
Pin 7DRV TEMPNormally HIGH, goes LOW when the driver is in an overheat fault.Pin17SYNC OUTOutputs a signal synchronized to the modulation output.
Pin 8QS TEMPNormally HIGH, goes LOW when no short present on THERM.Pin 18-19NCNo connection
Pin 9HVSWRHigh VSWR fault, normally HIGH, goes LOW during fault.Pin 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 threshold.Pin 21-24NCNo connection.
Pin 11HPHigh RF Power fault, normally HIGH, goes LOW during fault.Pin 25GNDGround
IndicatorsLocated on front panel
PowerPower Indicator – The module has 28 V 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. 1s to 14s.

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

Output frequency is "Factory Set When Ordered"

XX = 24, 27, 41, 68, or 80.

YY = 50 or 100 W nominal for 24, 27, 41, and 68 MHz units.

ZZZ = Mode (see table)