AMERITRON ALS-500M Instruction Manual Download Page 2

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 

the   external load is incorrect. 
 

5. Current 

meter.

 

 

The ALS-500M has a DC current meter to monitor collector current. 

 

6. Off/On 

switch.

 

 

This switch allows the amplifier to be by-passed for "bare-foot" operation without disconnecting 

 

the high current leads. 

 

7.

 

Remote Off/On control.

 

 

A separate connection on the power connector allows low current control of the amplifier Off/On 

 

function for remote mounting. 

 

8.  

Compact size.

 

 

The ALS-500M weighs only 7.5 pounds and measures 3 3/4"H x 9"W x 15 1/2"D . 

 

Summary of Contents for ALS-500M

Page 1: ...dic Maintenance 3 Technical Assistance 3 Export Modifications 4 Installation 4 Location 4 Power Requirements 4 Fuse Holder Installation 5 Auxiliary Battery Installation 5 Grounding 6 Unibody Vehicles...

Page 2: ...impedance is monitored and the amplifier is bypassed if the bandswitch setting or the external load is incorrect 5 Current meter The ALS 500M has a DC current meter to monitor collector current 6 Off...

Page 3: ...it occurs IC 1a compares the voltage from the Power Amplifier temperature diodes to the reference voltage from the temperature sensitivity control R28 If the temperature becomes too high voltage too l...

Page 4: ...ts of reflected power the internal safety circuitry will disable the amplifier Periodic Maintenance The lack of high voltage in this unit eliminates the chance of dirt and dust causing high voltage ar...

Page 5: ...les are not critical The relay control lead can be made from any good quality two wire cable Low level audio type cables sold for stereo and VCR use are ideal for the relay connection The RF cables sh...

Page 6: ...or solder and tape all connections The plug in fuse holders and 30 ampere fuses are for the red high current power leads Do not insert any fuses until wiring is complete These holders have Teflon coat...

Page 7: ...voltage drop in the negative supply lead the body chassis of the vehicle must be securely grounded to the engine The engine block of the vehicle is almost always poorly grounded to the body of the veh...

Page 8: ...ALS 500M Instruction Manual 7...

Page 9: ...s momentarily interrupted and restored This lead can also provide a remote operate standby function This can be accomplished by connecting a remote switch in series with this lead Connecting this lead...

Page 10: ...W FM or RTTY Gradually increase the output power and observe the DC AMPERES meter The current should be around 60 to 80 amperes at full output An external watt meter should indicate 400 watts or more...

Page 11: ...C103 106 Not used C104 105 Capacitor DM15 500 pF 208 5691 D101 102 Diode 1N34A 300 0346 R101 102 Resistor 3 watt 100 ohm 103 2100 R110 Resistor Trimpot 2 5k 104 2520 R103 104 Resistor 1 2 watt 100 ohm...

Page 12: ...3 Capacitor SM15 500v 150 pF 208 5396 C231 232 Capacitor Electrolytic 25v 10 uF 203 0654 D201 202 Diode 1N4007 300 0266 HD202 8 pin header 612 0108 L201 204 Ferrite Beads 412 1599 PCB Power Amplifier...

Page 13: ...ALS 500M Instruction Manual 12...

Page 14: ...0 pF 208 6152 C313 314 Capacitor SM 19 1000v 160 pF 208 6161 C315 316 Capacitor SM 19 1000v 220 pF 208 6221 C318 Capacitor SM 19 1000v 2700 pF 208 6272 C320 Capacitor Mica 500 v 27 pF 208 5270 C321 32...

Page 15: ...ALS 500M Instruction Manual 14...

Page 16: ...Board 862 0500 1 Q401 404 Transistor MJF 3055 305 3055 Q405 Transistor 2N6564 2N5064 321 6564 R401 416 417 424 425 429 Resistor 1 4 watt 470 ohm 100 2470 R402 430 Resistor 1 4 watt 22k 100 4220 R403...

Page 17: ...ALS 500M Instruction Manual 16...

Page 18: ...RCA 600 1225 J4 Jack Power 610 5012 B1 Fan 12 volt muffin 3 410 3512 C1 4 Capacitor Ceramic Disc 25v 01 uF 200 0416 C2 3 Capacitor Ceramic Disc 25v 1 uF 200 0754 Meter 100 Amp Induction Meter 400 2500...

Page 19: ...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...

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