ALS-500M Instruction Manual TABLE OF CONTENTS ALS-500M Features ........................................................................................................1 General Information.........................................................................................................2 Load Fault Circuit................................................................................................2 Bias Control Circuits ............................................................................
ALS-500M Instruction Manual ALS-500M FEATURES 1. Rugged devices. The ALS-500M uses four rugged linear RF power devices. 2. Fast warm-up time. The ALS-500M has no vacuum tubes to warm-up. 3. No tune operation. Tuning adjustments are not necessary. A simple one knob selector switch permits operation on frequencies between 1.5 and 21.6 MHz. 4. Load Fault Protection The PA load impedance is monitored and the amplifier is bypassed if the bandswitch setting or external load is incorrect. the 5.
ALS-500M Instruction Manual GENERAL INFORMATION Load Fault Circuit The ALS-500M features a load fault trip circuit that bypasses the amplifier if the amplifier frequency switch is set to a lower frequency range than the exciter or if the load reflected power exceeds 70-100 watts. This circuit virtually eliminates the danger of component failures due to operating errors.
ALS-500M Instruction Manual Supply Voltage Low voltage solid state amplifiers are very sensitive to power supply voltage changes. For maximum performance, the voltage should be maintained as high as possible consistent with component life. The devices used in this amplifier have demonstrated excellent life with supply voltages up to 16 volts, and will produce the rated output power at 14 volts dc.
ALS-500M Instruction Manual Written assistance is also available. Due to time delays in processing mail, please allow a minimum of three weeks for a written reply. Send questions to: Ameritron, 116 Willow Road, Starkville, MS 39759 Export Modifications A simple modification will allow operation on frequencies above 22 MHz. A parts kit to make this modification is available by sending a written request for an 19-10600 export modification kit along with a copy of your valid amateur license to the Ameritron.
ALS-500M AWG (single conductor) 10 gauge 8 gauge 6 gauge 4 gauge Instruction Manual Voltage Drop at 40 amps 0.04 V/ft 0.025 V/ft 0.015 V/ft 0.01 V/ft Maximum Length For Full Performance 5 ft. 8 ft. 12 ft. 20 ft. For best performance the voltage drop at maximum power in the high current power and ground leads should be limited to a 0.2 volt maximum. Refer to the Interconnections section for information on the wiring and fuse requirements of this amplifier.
ALS-500M Instruction Manual The battery should be securely mounted in a well ventilated area. The hydrogen gas that forms when the battery is charging can be explosive if trapped in a confined area. Remember that hydrogen gas rises, and it can be trapped in the top of any compartment. Vents must exit vertically above the area to be ventilated. Ventilation holes below the battery do not remove the hydrogen gas. The battery mounting must be secure and outside the passenger compartment of the vehicle.
ALS-500M Instruction Manual 7
ALS-500M Instruction Manual INTERCONNECTIONS 1. The negative battery lead must be disconnected from the battery post. 2. The positive battery terminal must be disconnected from the positive battery post. 3. Add a heavy ground strap from the engine block or the battery's negative lead to the chassis of the vehicle. 4. The long heavy black ground lead on the amplifier power plug should be connected to battery's negative ground cable terminal.
ALS-500M Instruction Manual OPERATION Follow these instructions in numerical order. Consult the manual for the exciter, if necessary. Be sure all electrical connections is properly wired and the vehicle is running with a fully charged battery. See the Installation instructions for wiring details. 1. Set the ALS-500M front panel ON-OFF to OFF. 2. Set the amplifier's frequency range switch to the same frequency as the exciter. 3. With the amplifier still OFF transmit into the antenna with the exciter.
ALS-500M Instruction Manual ALS-500M PARTS LIST Combiner Board Parts List Designator C101,102 C107,108 C109 C103,106 C104,105 D101,102 R101,102 R110 R103,104 R105,106 R107,108 R109 T101,102 T103 W101,102 Description Capacitor, Trimmer, 500V, 3-12 pF Capacitor, Ceramic Disc, 50v, .01 uF Capacitor, Monolithic, 50v, .33 uF Not used Capacitor, DM15, 500 pF Diode, 1N34A Resistor, 3 watt, 100 ohm Resistor, Trimpot, 2.5k Resistor, 1/2 watt, 100 ohm Resistor, 1/2 watt, 4.7k ohm Resistor, Film, 1/4 watt, 2.
ALS-500M Instruction Manual Power Amplifier Board Parts List Designator C225,226 C227,228 C237,238 C201,208,211,212-216, 229,230,235,236 C202,207,209,210,233,234 C203,205 C204,206 C217-220 C221,224 C222,223 C231,232 D201,202 HD202 L201-204 PCB Q201-204 R201,204,211,214 R202,203,205-209,210, 212,213,215,216-220 R221-232 R233-236 R237,238 R239,240 T201 T202,203 T204,205 T206,207 W201-202 Description Capacitor, DM19, 500v, 360 pF Capacitor, SM19, 500v, 750 pF Capacitor, DM19, 500v, 820 pF Capacitor, 50v, .
ALS-500M Instruction Manual 12
ALS-500M Instruction Manual Output Filter Board Designator C301,308 C302,307 C303,309 C304,310 C305,311,319 C306,312,317 C313,314 C315,316 C318 C320 C321-323 L301,306 L302,307 L303,308 L304,309 L305,310 RLY301 SW301(a&b) Description not used *Capacitor, SM-19, 1000v, 180 pF *Capacitor, SM-19, 1000v, 270 pF *Capacitor, SM-19, 1000v, 360 pF *Capacitor, SM-19, 1000v, 680 pF *Capacitor, SM-19, 1000v, 1500 pF *Capacitor, SM-19, 1000v, 160 pF* *Capacitor, SM-19, 1000v, 220 pF* *Capacitor, SM-19, 1000v, 2700 pF
ALS-500M Instruction Manual 14
ALS-500M Instruction Manual Bias Board Parts List Designator C401,406-421, C402-405 D401,402 D403 FB401-405 For IC401 IC401 IC402 HD401 HD402 PCB Q401-404 Q405 R401,416,417,424,425,429 R402,430 R403 R404,407 R405,411,414,419,422 R406 R408 R409,410,428 R412,420 R413,415,421,423,431,432 R418,426 R427 R433 Description Capacitor, Ceramic Disc, 50v, .1 uF Capacitor, Tantalum, 50v, .47 uF Diode, 1N4007 Diode, Zener, 5.
ALS-500M Instruction Manual 16
ALS-500M Instruction Manual ALS-500M Chassis Components Designator J1, 2 J3 J4 B1 C1,4 C2,3 Meter LED1 LED2 P1 SW1 Description Jack, SO-239 Jack, RCA Jack, Power Fan, 12 volt, muffin, 3" Capacitor, Ceramic Disc, 25v, .01 uF Capacitor, Ceramic Disc, 25v, .
ALS-500M Instruction Manual 116 Willow Road Starkville, MS 39762 Limited Warranty Ameritron warrants to the original purchaser that this product shall be free from defects in material (except tubes and RF output transistors) or workmanship for one year from the date of original purchase.
