High Power RF Driver:
For Acousto-optic Q-Switch

MQH0XX-YYDM-ZZZ
Former Model Number:390XX-YYDMZZZ-A

Description:

Key Features:

The MQH0XX-YYDM-ZZZ module is a HighPower RF Driver, designed to drive a QSwitch. The driver has two digital modulation
inputs: Fixed and Variable. These controls
allow the customer to issue a pulse
command of a "Fixed" pulse width, theduration determined by the Driver's pulse
width control, settable by the customer, or
issue a "Variable" pulse command, theduration determined by the input signal’spulse width. The output power is controlled
by the analog input, where the mode ofoperation is defined by ZZZ = A05 normalanalog mode, or R05 analog switched to fullRF 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) option are"Factory Set" when ordered. The RF Driver
requires forced air cooling.




24, 27.12, 40.68, 68, or 80 MHz RFFrequency (XX)0.01% Quartz Stabilized
Up to 100* watts RF power output (YY)
Two TTL Digital Modulation Inputs: fixedand variable pulse width.
Analogue Modulation or Triggered RFRamp Down Mode (ZZZ)
Up to 100 kHz Pulse Rate.
Fault Protection on Low Power, HighPower, and High VSWR
Operates on 28 VDCApplications:RF Driver for an Acousto-Optic Q-Switch
Device used to spoil the “Q” of a CW
laser so as to output an intense pulse oflight.

Used in industrial, medical, or military
applications.

The product delivered will be manufactured
to be compliant with EU Directive 2011/65/EU
for Reduction of Hazardous Substance. The
product will be manufactured to otherstandards upon customer request.

IWDS038 V1.0

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MQH0XX-YYDM-ZZZ
SPECIFICATIONS:PARAMETERSPECIFICATION

Output Frequency is "Factory Set When Ordered":
RF Frequency:

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

Spurious Levels:-50 dBc maximum

Harmonic Distortion
Digital Inputs:
Fixed Mod In
Variable Mod In-30 dBc maximum

Extinction Ratio:

35 dB minimum

RF Rise Time 10% to 90%

500 ns maximum

RF Fall Time: 90% to 10%

100 ns maximum

Modulation Repetition Rates:

1 Hz to 100 kHz for Fixed Modulation
DC to 100 kHz for Variable Modulation

TTL Levels, Triggered on Rising Edge. Pulse Width Applied >50 ns.
TTL Levels, TTL High = RF off

Fixed Modulation Output Pulse Width Adjustment Range: 1 to 14 s, Customer Adjustable
Available Pulse Control Options:
Pulse Control Mode is "Factory Set When Ordered":

ZZZ = ModeFPS = First Pulse Suppression
PPK = Pre Pulse Kill
A05 = Analog Control
R05 = RF Switched to Analog Control___ = Digital Modulation OnlyFPS Trigger / Analog input

Units configured with FPS, PPK: TTL Levels,Triggered on TTL Rising Edge.
Units configured with A05, R05: 0 to 5 volts analog.

*RF Output Power "Factory Set When Ordered":

YY = 50 or 100 watts nominal for 24, 27, 41, and 68 MHz units
Adjustable from 25 to 100 watts.
50 watts nominal for 80 MHz units, Adjustable from 20 to 50 watts.

Output Impedance:

50 ohms nominal

Shutter Output:

0.3 sec delay. Opens on fault. Capable ofsinking 1 amp at 28 volts Maximum.

Supply Voltage Input+28 VDC  1%

Supply Current Input

6.5 A for 50 W units

Operating Temperature+10C to +55C

Air Flow through Heat Sink

> 36 CFM (> 17 litres / second) @ 25CSee Figure 2
See Figure 3
See Figure 4
See Figure 5
See Figure 6

9.0 A for 100 W units

MAXIMUM RATINGS:
Supply Voltage:

30 volts DC maximum

Power Output:

No DC Feedback AllowedStorage Temperature:-20C to +85CPage 2 of 11

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CONNECTORS & MECHANICAL:

Located on front panel

RF Output Connector:

BNC Female

Power Supply Connections:

Vcc
Return25PIN D-SUB CONNECTOR PINOUT:

Located on front panel. See Detail A of Outline Drawing.

Solder Post
Ground Lug

1+5V+5V output for external fault indicators, 75 mA available.

2–3

NCNo connection.

4THERM RTN

Ground – to be used as a return for THERM.

5NC

No connection.

6THERM

Thermostat connection – driver enters a fault condition unless this is
Shorted to ground.

7DRV TEMP

Normally HIGH, goes LOW when the driver is in an overheat fault.

8QS TEMP

Normally HIGH, goes LOW when no short present on THERM.

9HVSWR

High VSWR fault, normally HIGH, goes LOW during fault.

10LPLow RF Power indicator, normally HIGH, goes LOW while driver
output is below the Low RF Power threshold.

11HP

High RF Power fault, normally HIGH, goes LOW during fault.

12

MOD IN ANALOG

Controls the output power level in A05 and R05 models

13

FAULT RESET

Pulse 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.

14

FPS TRG

Triggers a suppression pulse on a RISING edge.

15

MOD IN FIXED

Turns the driver off for the duration set by the pulse width control.

16

MOD IN VARIABLE

Turns the driver off while this input is HIGH.

17

SYNC OUT

Outputs a signal synchronized to the modulation output.

18-19

NCNo connection.

20SHUTTER0.3 sec delay. Opens on fault. Capable of sinking 1 amps at 28 voltsmaximum.

21 -24NC

No Connection

25GNDGround.

Note: Some Control Signals Shown on Outline Drawing are Not Available on Standard Units.
INDICATORS:

Located 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 Power

Faults when power above HP Set Point.
Reset required after removing fault.

High VSWR

Faults when reflected power above VSWR Set Point.
Reset required after removing fault.

QS Temp

Faults on open Thermostat.
Resets on closed Thermostat. (Q-Switch below set temperature)

DRV Temp Driver

The internal temperature of the module has reached 60C.
The driver will remain in this fault condition until it cools down.
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ADJUSTMENTS:

Located Inside Unit Through Holes in Module Top CoverRF Power Level Adjustment

Adjusts the output RF Power.

LP Set Point

Adjusts the minimum power threshold. If the module’s output goes
Below this set value, the low power warning light will turn on, but the driverwill continue to output power. This is a warning, not a true fault condition.

HP Set Point

Adjusts 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 Point

Adjusts 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 Width

Adjusts the length of time the driver outputs no RF energy after receiving atrigger. 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 Start

Adjusts the initial power level of the first pulse.

FPS Slope

Adjusts how quickly the RF pulses return to their normal level after the FPS
has been triggered. 20 s to 300 s.

FPS Window

Adjusts the duration of the suppression pulse cycle. 20 s to 300 s.

Note: Some Adjustments Shown on Outline Drawing are Not Available on Standard Units.

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeMechanical Dimensions:Dimensions in inches and [mm]Page 5 of 11

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Control Diagrams
Figure 2

MQH0XX-YYDM-FPS (HIGH POWER) First Pulse Suppression Control
Connection and Control Diagrams

External Fault Indicators

HP

LP

HVSWR

QS Temp

DRV Temp

Thermostat on Q Switch

NC

Fault Reset+5V Output

14145615 16 1778910 11 12 132025Shutter Out

C A B
Sync OutTTL HIGH

Mod InA
Fixed TTL LOW
B

Mod In TTL HIGH
Variable
TTL LOWCTTL HIGH
FPSTriggerTTL LOW

RF OutPulse Width
1-14 μsFPS Window
20-300 μs
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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 3

MQH0XX-YYDM-PPK (HIGH POWER) Pre-Pulse Kill Control
Connection and Control diagram

HP

LP

HVSWR

QS Temp

DRV Temp

Thermostat on Q Switch

External Fault Indicators

NC+5V OUTPUT

Fault Reset

141415165617789101120121325Shutter Out

C A B
Sync OutTTL HIGH

Mod InAFixedB

TTL LOWMod In TTL HIGH
Variable
TTL LOWCFPSTrigger

TTL HIGH

TTL LOW

RF OutPulse Width
1-14μsFPS Window
20-300μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 4

MQH0XX-YYDM-A05 (HIGH POWER) Analog 5 Volt Control
Connection and Control Diagrams

External Fault Indicators

HP

LP

HVSWR

QS Temp

DRV Temp

Thermostat

Fault ResetC1414NCA

Mod InFixed

151661778910111220A B

1325Shutter Out
Sync OutTTL HIGH

TTL LOWB

Mod InVariable

TTL HIGH

TTL LOW
5V

Mod InCAnalog
Threshold
0VRF Out

Pulse Width
1-14 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 5

MQH0XX-YYDM-R05 (HIGH POWER) RF Switch to Analog 5 Volt Control
Connection and Control Diagrams
DRV QS HV
Te Te SWmp mp R

Thermostat on Q SwitchLP HP

External Fault Indicators

CFault Reset+5V OUTPUT

1414NCAMod In
Fixed1516A B

5176789101120121325Shutter OutSync Out

TTL HIGH

TTL LOWB

Mod InVariable

TTLHIGH

TTL LOWCMod InAnalog5V

Threshold0V

RF OutPulse Width
1-14 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeFigure 6

MQH0XX-YYDM (HIGH POWER) Digital Control Only
Connection and Control Diagrams

Thermostat on Q Switch
DRQS
VTe Temp mp

HVSWRLPHP

External Fault Indicators
Mod in Analog(Not Used for thisControl Mode.)+5V Output

Fault Reset

1414FPS Trigger(Not Used for thisControl Mode.)15

516 1767891011 1220

1325

Shutter Out

A B
Sync OutTTL HIGH

Mod InA
FixedMod In
B
Variable

TTL LOWTTL HIGH

TTL LOW

RF OutPulse Width
1-14 μs

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As part of our policy of continuous product improvement we reserve the right to change specifications at any timeOrdering Codes:
Example: MQH027-100DM-A05

A 27 MHz RF Driver with two TTL Digital Modulation inputs (fixed and variable pulse width) andan analog input (A05) which enables control of the RF output power. Designed to Drive an AO QSwitch requiring 100 watts RF Power or less. Delivered as a RoHS compliant, forced air cooled
OEM Module.
Optional

M Q H X X X

Option-Y Y Y D M -OptionalZ Z Z-Optional company information
if customized(2 letters +number)
Code - Standard
Frequencies
024 24.000 MHz
027 27.120 MHz
041 40.680 MHz
068 68.000 MHz
080 80.000 MHz

Code – Standard Control Options
A05 - Analog 0 to +5 V Power Control
R05 - Analog 0 to +5 V Power Control - Switched
FPS – First Pulse Suppression
PPK – Pre Pulse Kill
No Code when specified as TTL Digital only

Q-Switch DriverM - OEM Module
S - Rack Mountable Box

D - Digital
RF Power 12 to 100 watts range

Technical Assistance & Customization
Our Engineering and Sales team are available to discuss your requirements and will assist youin selecting the most appropriate acousto-optic Q-Switch/ Driver combination for your application.

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As part of our policy of continuous product improvement we reserve the right to change specifications at any time