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Ameritron ALS-1300 

1200-watt 

NO TUNE

  

TMOS-FET AMPLIFIER

 

 

The Ameritron ALS-1300 is a 160 through 15-meter 1200-watt output solid-state amplifier. An optional user-
installed MOD-10MK filter assembly extends operation to 12- and 10-meters.  The ALS-1300 uses eight 50-
volt conservatively rated linear RF MOSFETS. These 50-volt linear FET’s produce an exceptionally clean 
signal compared to other solid-state amplifiers. Fan speed is regulated by temperature sensors assuring 
conservative cooling with minimum noise.  
 
Nominal driving power is 90 watts for 1200-watts output (approximately 11 dB gain) on most bands. The 
compact 10.5” wide by 6.75” high amplifier package (depth only 19”) fits nearly any station configuration. The 
attractive desk-top amplifier unit weighs only 22 pounds.  
 
An external 50-volt 50-ampere regulated switching power supply powers the ALS-1300. The supply is wired 
for 240 VAC (200-260 VAC, 50-60 Hz, 15 amperes), but can be rewired for 120 VAC operation for lighter duty 
operation.  
 
 
 

Summary of Contents for ALS-1300

Page 1: ...olid state amplifiers Fan speed is regulated by temperature sensors assuring conservative cooling with minimum noise Nominal driving power is 90 watts for 1200 watts output approximately 11 dB gain on most bands The compact 10 5 wide by 6 75 high amplifier package depth only 19 fits nearly any station configuration The attractive desk top amplifier unit weighs only 22 pounds An external 50 volt 50...

Page 2: ...ements 4 Power Supply Features 4 Power Supply Location 4 GENERAL INFORMATION 5 Amplifier 5 Power Supply 5 INSTALLATION 5 Airflow 6 INTERCONNECTION WIRING 7 AMPLIFIER REAR PANEL 8 FRONT PANEL 9 OPERATION 10 MARS OR CAP OPERATION 11 INITIAL OPERATION 12 CIRCUIT BOARDS 14 TECHNICAL INFORMATION 26 ...

Page 3: ...etering PEP forward power and PEP reflected power metering Reflected power protection Bandswitch error protection Standard negative going ALC output with front panel adjustment ALC metering and an ALC LED indicator 5 milliseconds receive to transmit relay switching Adjustable Forward and Reflected peak meter hold time Adjustable meter brightness Fully regulated external power supply Compact size 1...

Page 4: ...ation is minimially affected by 120 volt operation Fuse size should be 25 amperes maximum at 120VAC Power Supply Features Efficient operation from 200 260 volts ac 12 amperes minimum and 100 135 volts 20 amperes minimum Wide range of power line frequencies 40 400 Hz Fully regulated current limited outputs Step start to limit stress on power supply components Exceptional filtering and RFI suppressi...

Page 5: ...ter The right hand meter continuously displays forward RF peak envelope power on one dedicated scale while the second movement is switch selected between reflected power combiner mismatch voltage ALC and the drain voltage of each power amplifier While this amplifier will run more than 1200 watts PEP output linearity will suffer Ameritron recommends running no more than 1200 watts peak power for ma...

Page 6: ...andard NEMA 6 15P 15 ampere 240 volt plug The round center pin is the safety ground Do not remove the safety ground CAUTION Before connecting the power supply to an electrical outlet always be sure you have completed the following four steps 1 Insert the 15 ampere 250V fuses into the two black fuse caps 2 Insert the fuse and cap assemblies into the power supply s fuse holders The fuses lock in pla...

Page 7: ...7 Interconnection Wiring ANT RLY ALC OUT IN RLY ALC TRANSMITTER TRANSCEIVER ALS 1300 POWER SUPPLY INTERCONNECTIONS ANTENNA ANTENNA TUNERS SWITCHES FILTERS REMOTE A B FUSE FUSE Interconnections Figure 1 ...

Page 8: ...ltage from the ALS 1300 is 12 volts positive with only 15 mA current You should always check your transceiver s manual but almost any standard transceiver directly interfaces to this amplifier 4 Connect the OUT output port to the appropriate point in your station This is the high power RF output cable This connection would go to your 1500 watt rated Power SWR meter antenna or antenna matching devi...

Page 9: ...9 Front Panel Amplifier Front Figure 2 ...

Page 10: ...mplifier to a safe level when the rear ALC Jack is connected to the transceiver s ALC input The ALS 1300 produces an ALC control voltage of 0 to 4 volts DC ALC Indicator Fig 2 6 page 9 illuminates when the ALC circuit begins producing a negative voltage at the rear panel ALC jack SWR Indicator Fig 2 6 page 9 illuminates when the Antenna VSWR reaches an unsafe level for the amplifier When this occu...

Page 11: ...is amplifier is very simple to operate Once you have established proper connections please set the amplifier Fig 2 ref 3 to one of the following bands Band Frequency Range Notes 160 1 8 2 1 MHz 80 3 2 4 2 MHz 40 6 0 7 5 MHz 30 7 5 14 0 MHz US domestic power limit is 200 watts maximum 20 13 5 14 5 MHz 17 14 5 19 0 MHz 15 19 0 22 0 MHz 12 22 0 25 0 MHz Export Only Requires user installed MOD 10MK fo...

Page 12: ... 1 Place the MULTIMETER switch fig 2 ref 7 in the HV2 position Place the ALC SET control fig2 ref 5 fully clockwise 10 on scale 2 With the STANDBY OPERATE switch fig 2 ref 8 on STANDBY turn the power switch ref 9 ON 3 There will be a 3 5 second step start circuit delay and then a click as the power supply turns on HV2 fig 2 ref 2 should immediately rise to nearly full scale and after a slight dela...

Page 13: ...d increase slightly on both scales of the current meter fig 2 ref 1 No other lights should illuminate 11 Briefly increase drive power no more than 100 watts until the ALS 1300 output is 1200 watts 12 If ALC is connected between the amplifier and transceiver rotate the ALS 1300 front panel ALC control counter clockwise until the ALS 1300 output power just begins to drop 13 After you have verified a...

Page 14: ... outputs of the two 600 watt PA modules It is a traditional 50 ohm magic T combiner with an output matching transformer FL10 The FL10 filter assembly MOD 10MK is optional and only appears in export models It enables 10 and 12 meter operation MB1 The MB1 is located behind the front panel below the meters It contains peak envelope power detection circuits multi meter switching fault indicators and A...

Page 15: ...through a rear panel hole Schematics Filter 2KWF rev 03 Mar 2009 Gnd Gnd 10 15 20 40 80 160 081210 FL10 2KWF 1R1 Ant Rly PA Out Rly FL 10 FL 10 PA Comb Out PA A PA B C99 Gimmik PA IN RADIO RLY9 C23 1 C24 1 C25 1 C26 1 C27 1 RLY12 RLY10 RLY8 RLY6 RLY4 RLY2 12VDC RLY11 RLY9 RLY7 RLY5 RLY3 C22 1 RLY11 J1 J4 C17 180 C13 270 C5 680 C1 1500 C9 360 L9 6 5T RLY12 RLY10 RLY8 RLY6 RLY4 RLY2 C20 180 L10 6 5T...

Page 16: ...2V 10 15 20 40 80 160 G 12V 12V 10 12 15 17 20 30 40 80 160 9 8 7 6 5 4 3 2 1 SW 1 rear view BS 1 J3 D1 1N4001 D2 1N4001 D3 1N4001 D4 1N4001 D5 1N4001 D6 1N4001 J1 J2 LED1 160 LED2 80 LED3 40 LED6 17 LED5 20 LED4 30 LED8 12 LED7 15 LED9 10 R1 1k BS1 bandswitch figure 4 ...

Page 17: ... 1 U2B U2D U2A U2C C21 47 Q3 3904 Q4 3904 Q7 3055 Q6 3055 C10 01 VR10 25k 40 C4 01 C1 1 50v C16 1 J6 C27 1 C26 1 C25 1 C24 1 C23 1 C36 1 C32 47 50v VR1 1k 40 VR2 1k 40 VR4 1k 40 VR3 1k 40 VR8 1k 40 VR7 1k 40 VR6 1k 40 C33 47 50v VR5 1k 40 C37 1 C34 1 J3 D10 916 C13 1 Q12 3055 C7 01 50V C17 1 C18 1 C20 47 U5 LM7809 U4A LM358 U4B LM358 D9 D8 C22 47 C15 47 U4pin4 U4pin8 U2pin11 U2pin4 DC12V Switched ...

Page 18: ...0 watt CMB CMB 081217 rev0a 100 50 OHMS OUT 50 OHMS IN 50 OHMS IN T5 T6 PA A PA B CMB combiner board Figure 6 Filter FL10 FL10 081210 Out In L2 1 C4 130pF C3 130pF C2 130pF L1 1 C1 130pF FL10 filter 10 meter Figure 7 ...

Page 19: ...CAL REF SPEED CAL FWD SPEED CTRL C14 1 D3 LED1 D2 LED2 Q1 2N3904 C15 1 Q2 2N3904 D1 LED3 D6 1N916 D2 1N916 C16 1 D4 LED4 C12 1 C7 1 U2B LM358 U1A LM324 R39 10k 10 C4 2 2uF C3 2 2 U1C U2A U1D U1B R16 1m 40 R15 1m 40 C17 1 C13 1 R C V1 V2 R C A V1 A V2 C5 1 J2 J3 J4 R2 2 5k 40 C2 1 D3 1N916 C8 01 D1 1N916 J1 C6 1 C1 1 R1 2 5k 40 D4 1N916 D5 1N916 C9 01 C10 1 D7 1N916 C11 1 D8 1N916 D9 1N916 R22 1k R...

Page 20: ...33uF C1 1uF C4 1uF C5 1uF C8 1uF C17 33uF C16 33uF C12 1uF C14 1uF C15 1uF C18 1uF Q4 Q3 C10 470pF R1 NTC R2 NTC R21 470 R12 470 R28 470 R5 470 R18 22 R17 22 R16 22 R13 22 R14 22 R15 22 R6 18 R8 18 R9 1k R7 1k R4 1 R3 18 R11 1 R10 18 R22 18 R24 18 R25 1k R23 1k R20 1 R19 18 R27 1 R26 18 PAM power amplifier module Figure 9 Power Divider PD8 081126 PD8 rev0 8db splitter T1 T2 I n Out Out R7 100 R5 2...

Page 21: ...2 C1 0 1uF D2 D1 J3 CONN Pin1 Pin2 Pin7 Pin5 Pin3 Pin4 Pin8 Pin6 Pin1 Pin2 Pin7 Pin5 Pin3 Pin4 Pin6 Pin8 1 2W R2 560 R1 1k RJ45 interface Figure 11 Relay Board PA OUT HD1 HD4 RL4 RL1 ANTENNA RADIO PA IN RLA 081210 MAY 21 2008 RLY antenna relay Figure 12 ...

Page 22: ...22 WHITE GREEN ...

Page 23: ...23 White 50V ...

Page 24: ...24 ...

Page 25: ... control board Figure 5 17 CMB combiner board Figure 6 18 FL10 filter 10 meter Figure 7 18 MB1 alc metering board Figure 8 19 PAM power amplifier module Figure 9 20 PD8 power divider Figure 10 20 RJ45 interface Figure 11 21 RLY antenna relay Figure 12 21 Meter Wiring 22 Power Plug Wiring 23 Power Supply Wiring 24 Tables Frequency Limits Table 1 1110 ...

Page 26: ... isolation occurs regardless of input port termination The attenuators also work in concert with the magic T to provide a 50 ohm input termination for each PA module The 50 ohm termination and input port isolation results in unconditionally stabile PA modules PA Amplifiers Power amplification comes from two 600 watt power amplifier modules Each PA module PAM 600 consists of four MFR 150 field effe...

Page 27: ...nced and illuminates the PA front panel light 2KWF Lowpass Filter Assembly The output of the high power combiner goes into the 2KWF lowpass filter assembly Power enters through a directional coupler consisting of T2 C28 98 and 99 and R2 This system detects power amplifier termination errors Any significant error will trip the power amplifiers off A comparator on the CB1 control board monitors dire...

Page 28: ...ginal container or equivalent fully insured and with shipping charges prepaid Correct maintenance repair and use are important to obtain proper performance from this product Therefore carefully read the Instruction Manual This warranty does not apply to any defect that Ameritron determines is due to 1 Improper maintenance or repair including the installation of parts or accessories that do not con...

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