ALC on the ALS-600

Link to ALS-600 on line Manual. 

Here is a breif description of adjusting the ALC on the ALS-600 that I found on the net.  It is more about what it's for than actual adjusting.

"AMERITRON ALS-600 (PDF File) ...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.

So, are you supposed to increase the ALC till the output quits rising?  Or are you supposed to increase the ALC until your SWR begins to rise?

Check out the manual link above.

More info about the Amp:

www.lachaussie.net/Manuals/als-600.pdf




The Ameritron ALS-600 is a 600 nominal watt 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 (160 thru 15 meters) with no tuning adjustments. Broad band 5 pole low pass filters provide output harmonic suppression in excess of all FCC requirements. An AMR-MOD-10MB modification kit is available to extend operation up to 30 MHz with a copy of a valid amateur license.

The ALS-600 uses four MRF-150 FET's operating at 50 volts in a double ended pushpull 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 separate power supply, ALS-600PS, is shipped factory wired for 120 volt, 50/60 Hz power mains and is easily converted to other supply voltages between 100 and 240 volts.