AMERITRON ALS-600 Manuel utilisateur

AMERITRON ALS-600/S

600 WATT NO TUNE

TMOS-FET AMPLIFIER

INSTRUCTION MANUAL

AMERITRON

116 WILLOW ROAD

STARKVILLE, MS 39759 USA

662-323-8211

Revision 6a

Table of Contents

ALS-600 Specifications…………………… …………………………………………. 4

Optional Accessories…………………………… …………………………………. 5

ALS-600 Features............................................................................................................6

Power Supply Features....................................................................................................8

ALS-600PS..........................................................................................................8

ALS-600SPS........................................................................................................8

ALS-600PS and ALS-600SPS.............................................................................8

General Information.........................................................................................................9

Amplifier..............................................................................................................9

Power Supply.......................................................................................................9

Export Modifications...........................................................................................10

Amplifier Circuitry..........................................................................................................10

Wattmeter Circuits...............................................................................................10

ALC (Automatic Level Control)..........................................................................10

Thermal Overload................................................................................................11

Load Fault Indicator.............................................................................................12

SWR Considerations............................................................................................12

Power Supply Circuitry (ALS-600PS)............................................................................13

Line Voltage Modifications.................................................................................13

High Voltage Section...........................................................................................14

Primary Circuit.....................................................................................................14

Low Voltage Circuits...........................................................................................14

Switching Power Supply Circuitry (ALS-600SPS).........................................................15

Line Voltage.........................................................................................................15

High Voltage Section...........................................................................................16

Primary Circuit.....................................................................................................16

Low Voltage Circuits...........................................................................................16

Installation........................................................................................................................16

Amplifier Location...............................................................................................16

Power Supply Location........................................................................................16

Grounding............................................................................................................17

Power Requirements............................................................................................17

Interconnections...............................................................................................................18

Operation..........................................................................................................................20

Duty Cycle Considerations… …………………………………………..20

ALC Set-Up……………………………………………………………………..20

SSB Operation.....................................................................................................20

CW Operation......................................................................................................21

RTTY, FM and Other High Duty Cycle Operation.............................................21

AM Operation......................................................................................................22

Drive Power Requirements..................................................................................22

ALS-600 Remote Control Operation and Automatic Band Tracking.................24

ALS-500RC Remote Control Operation..............................................................25

ARI-500 Automatic Transceiver Frequency Tracking........................................25

Periodic Maintenance...........................................................................................25

Technical Assistance........................................................................................................26

ALS-600 Parts Lists & Schematics..................................................................................27

Meter/ALC Board................................................................................................27

PA Board..............................................................................................................29

Output Filter Board..............................................................................................30

LED Board...........................................................................................................34

SWR Detect Board...............................................................................................35

ALS-600 Chassis Components............................................................................36

ALS-600PS Parts Lists & Schematics.............................................................................38

Power Supply Board............................................................................................38

ALS-600PS Chassis Components........................................................................39

ALS-600SPS Wiring Diagram.........................................................................................40

ALS-600SPS Schematic .................................................................................................41

ALS-600 SPECIFICATIONS

Output Power: 600 Watts PEP SSB, 500 Watts CW typical

Frequency Coverage: 1.5 to 22 MHz (10/12 Meters with MOD-10MB)

Driving Power Required: 100 watts maximum

Input SWR: 1.5:1 maximum

Spurious Outputs: Greater than 45 dB down

Intermodulation Distortion: Greater than 25 dB down

SWR Protection: Amplifier is bypassed if reflected power exceeds 75

watts. Prevents amplifier damage if you select the

wrong band or wrong antenna, or have high SWR

Over Power Protection: If output forward power or reflected power exceeds

safe level, output power is automatically reduced by

controlling the exciter ALC.

Metering (ALS-600): Illuminated Cross-Needle SWR/Wattmeter -- lets you

read SWR, and forward and reflected peak power

simultaneously

Metering (Power Supply): Illuminated Cross-Needle Meter monitors voltage and

current of 50 VDC line.

Operate/Standby Switch: Lets you run "barefoot", or instantly switch to full

power.

ALC Controls: Front Panel - exclusive Ameritron feature -- lets you

adjust your amplifier output power.

Rear Panel – sets ALC range to match your

transceiver.

T/R Relay Drive Rqmts: Must support 12VDC at 100ma maximum, ground to

enable

Indicators: Transmit, ALC and Load Fault LED indicators to keep

you informed.

Accessory Power: Rear panel 12 VDC/200 ma RCA-type output jack for

powering low current accessories.

Power Supply: Separate ALS-600PS or ALS-600SPS power supply

can be placed conveniently out of the way and

plugged into your nearest 120 VAC outlet -- no

special wiring needed. Supplies 50 VDC at 25 amps

to ALS-600 amplifier.

The ALS-600PS includes an exclusive Multi-Voltage

Power Transformer to compensate for stressful high

line voltage and performance robbing low line voltage.

Both the ALS-600PS and ALS-600SPS power

supplies can be configured for 120VAC or 240VAC

operation.

Step-Start Current Inrush Protection extends the life

of power supply components.

Power Requirements: 100-130VAC or 220-250VAC, 50/60 Hz. Wired for

120VAC. The ALS-600PS draws less than 12 amps

at 120VAC, and less than 6 amps at 230 VAC. The

ALS-600SPS draws less than 14 amps at 120VAC,

and less than 7 amps at 240VAC

Dimensions (ALS-600): 6"H x 9.5"W x 12"D (takes up less desktop space than your

transceiver)

Dimensions (Power Supply): 6"H x 9.5"W x 14”D -- can be placed conveniently out-of-

way.

Weight (ALS-600): 12.5 pounds

Weight (ALS-600PS): 32.5 pounds (linear power supply)

Weight (ALS-600SPS): 10 pounds (switching power supply)

OPTIONAL ACCESSORIES

•MOD-10MB Modification Kit for 10/12 meters

•QSK-5 High Power Pin Diode T/R Switch

•ALS-500RC Remote Control Head for ALS-600 (Ser. No. 14378 and higher)

•ARI-500 Automatic Band Switch for ALS-600 (Ser. No. 14378 and higher)

- ARI-500 Interface Cables. Check with Ameritron for pre-made cables for

popular transceivers.

•ARB-704 Amplifier-to-Transceiver Interface

PNP-8D cable for FT-1000, (MP), 900, 767GX, 920, 990, 747GX

PNP-8M cable for FT-890, 840, 817, 857/D, 897/D

PNP-35 cable for FT-100/D

PNP-5M cable for FT-847

PNP-7D cable for TS-440, 690, 450, 180, 140, 950, 130, 870, 2000,

50, 120, 530, 430, 830, 949, 570

PNP-13D cable for IC-706/703/7000 series

PNP-7DK cable for TS-930

PNP-8MK cable for TS-480

PNP-5D cable for FT-980

PNP-8DI cable for ICOM ACC Jack

Check with Ameritron for additional cables as they become available

ALS-600 AMPLIFIER FEATURES

Rugged devices. The ALS-600 uses four rugged MRF-150 RF power FETs

All solid-state means instant warm-up. No-wait amplifier operation.

No tune operation. No tuning is necessary. A simple one knob band selector switch

permits operation on frequencies between 1.5 and 22 MHz (24-30 MHz with MOD-

10MB Modification Kit for 10/12 meters).

ALC protection. The output and reflected power levels control the exciter ALC voltage.

This helps prevent damage to the amplifier.

Front panel ALC control. This unique Ameritron feature allows easy front panel

adjustment of the ALC threshold to control power output.

Load Error Protection. The PA load impedance is monitored and the amplifier is

bypassed if the band switch or the external load is incorrect.

Illuminated Power/SWR meter. The ALS-600 has an illuminated cross-needle peak

reading RF power meter. Accurate directional coupler and peak storage circuits give

simultaneous forward and reflected peak power readings while simultaneously indicating

load SWR.

Operate/Standby switch. This switch allows the amplifier to be by-passed for "barefoot"

operation without turning the main power switch off and on.

Transmit, ALC and Load Fault Indicator LED's. Front panel LED's provide an

indication of amplifier status during operation.

12 volt auxiliary jack. This jack supplies +12v at 200 ma to operate low current

accessories.

Thermal Overload Protection. The transmit relay in the amplifier is disabled if

excessive heatsink temperatures are reached.

Compact size. The ALS-600 weighs only 12.5 pounds and measures 6"H x 9.5"W x

12"D.

Remote Amplifier Operation. The ALS-600 amplifier can be tucked out of the way

when used with the optional ALS-500RC Remote Control Head. The ALS-500RC

provides band switching, transmit and load fault indicators, output power monitoring, and

fault re-setting in a compact control and display unit.

Automatic Transceiver Frequency Tracking. The optional ARI-500 Automatic Band

Switch unit interfaces frequency band information for most transceivers to the ALS-600.

So as you change frequency bands on your transceiver, the ALS-600 automatically

follows these band changes. The ARI-500 may be configured for automatic fault re-

setting of the ALS-600 if desired. These features make the ARI-500 particularly

convenient for contest operations. The ARI-500 Automatic Band Switch includes an

input for the ALS-500RC Remote Control Head, so both may be used simultaneously if

desired.

POWER SUPPLY FEATURES

ALS-600PS

Multi-voltage heavy duty transformer. A unique "buck-boost" winding allows

compensation for up to six different power line voltages centered on 115 and 230 volts.

This versatile Ameritron feature maintains optimum voltages on the amplifier

components for maximum performance and life.

Choke input filtering. The ALS-600PS standard power supply uses an input choke to

provide a low power factor to the power lines. This reduces the peak currents drawn from

the line and improves the voltage regulation of the supply.

ALS-600SPS

Light weight. The ALS-600SPS is a light weight switching power supply to use with the

ALS-600 amplifier. It is 1/3rd the weight of the ALS-600PS linear power supply. The

ALS-600 amplifier with the ALS-600SPS switching power supply is ideal for travel.

Hash free. The specially designed switching and filter circuit makes the power supply

hash free.

Simple power line voltage options. The power supply will safely operate from 90-135

VAC in the 120 VAC setting, and 185-260 VAC in the 240 VAC setting.

ALS-600PS and ALS-600SPS

Step-start circuit. This circuit uses a relay and resistor to limit the inrush current to the

power supply. This circuit extends the life of the power supply components.

Current and output voltage metering. An illuminated cross needle meter monitors the

output voltage and current of the 50 volt output line.

GENERAL INFORMATION

Amplifier

The Ameritron ALS-600 is a 600 watt nominal output, solid state, linear amplifier using

state-of-the-art, high voltage, RF TMOS FET devices in the power output section. The

ALS-600 provides continuous frequency coverage from 1.5 through 22 MHz with no

tuning required. Broad-band 5 pole low pass filters provide output harmonic suppression

in excess of all FCC requirements. The MOD-10B kit provides operation up to 30 MHz

(copy of a valid amateur license is required to purchase the MOD-10B).

The ALS-600 uses four MRF-150 FET's operating at 50 volts in a double ended push-

pull parallel output configuration. High quality RF components combine with an

accurate peak detecting directional coupler, front panel adjustable ALC circuit with

automatic SWR foldback, and one switch frequency selection to make this one of the

easiest to operate amplifiers available. The matching power supply, an ALS-600PS or

ALS-600SPS, is shipped factory wired for 120 volt, 50/60 Hz power mains. The power

supplies are easily converted to other supply voltages between 100 and 240 volts.

Low Pass Filter Selection

Low pass filter networks must be selected for the different HF frequency ranges in order

to meet FCC requirements. The ALS-600 uses relay-selected low pass filter networks to

permit the selection of the proper filter networks by three different methods:

•The FREQ switch on the front panel of the ALS-600

•The band switch on the optional ALS-500RC Remote Control Head

•Automatically by the optional ARI-500 Automatic Band Switch

Power Supply

The ALS-600PS power supply is designed to power the ALS-600 amplifier from 50 to 60

hertz AC power mains that range from 100-130 VAC and 210-240 VAC. The ALS-

600SPS has a terminal strip where the AC voltages can be selected as either 120 or 240

volts 50/60 Hz, and will safely operate from 90-135 VAC in the 120 setting, and 185-260

VAC in the 240 VAC setting. All ALS-600PS/ALS-600SPS supplies are wired for

standard 120 volt systems and are shipped with a NEMA 5-15P three wire plug.

Both power supplies provide the power required to operate the ALS-600 in typical

continuous amateur service at 600 watt output levels. The ALS-600PS/SPS power

supplies provide the three DC voltages required by the amplifier unit. The high voltage

section supplies approximately 50 volts at a load current of 25 amperes.

10/12 Meter Modification

A simple modification allows operation on frequencies up to 30 MHz. A parts kit to

make this modification is available by sending a written request for the MOD-10MB

modification kit, along with a copy of your valid amateur license to Ameritron. There is

a nominal charge for this kit. Export models are shipped with this modification installed.

The ALS-600(S)Y is the export model for 115-130 VAC operation and the ALS-600(S)X

is the export model for 220-240 VAC operation.

AMPLIFIER CIRCUITRY

Wattmeter Circuits

The BIAS/WM/ALC board contains the peak power detector circuits. The rear panel

directional coupler connects to IC101D/C. IC101D/C drives Q101/102 to charge

C103/106 to the peak voltage from the directional coupler. C103/106 is lightly loaded by

IC101A/B and R103/107. This allows enough "hang" time for the meter to accurately

indicate peak power levels.

Accurate forward peak power readings are obtained under mismatched load conditions

when the reflected power is deducted from the forward power readings.

The average and peak envelope power values are EQUAL on CW, FSK and FM (modes

that do not have amplitude changes in the carrier). The average power level of voice or

other complex waveform signals has NO SET RATIO of peak to average power.

ALC (Automatic Level Control)

The ALC circuit functions by using a comparator (IC103A) to reduce the exciter drive

power if the output power of the ALS-600 exceeds a preset value. The ALC circuit also

reduces the drive power if the SWR increases while operating with the ALC controlling

the amplifier output power level. The ALS-600 ALC output should be connected to the

proper exciter external ALC connection point with a shielded audio type cable. Consult

the exciter manual for the proper exciter connection details.

Operation at high audio gain levels on SSB with ALC has the same effect as an RF

speech compressor. RF compression increases SSB "talk power". Background noise

pickup also increases when the exciter gain is operated at high levels to increase

compression. Audio distortion does not normally occur with this type of speech

processing if the ALC circuit in the exciter is properly designed.

Do not attempt to limit the CW power more than a few percent solely with the amplifier

ALC circuit. Using the amplifier ALC to reduce CW power levels may result in pumping

of the output power during dots and dashes. The "ALC SET" control will be correctly

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