Specifications

Conclusion

The compact Ameritron ALS-600 solid-state amplifier Ameritron, now with remote

control and automatic band changing options, is a very affordable unit with pricing and

features that let it fit many budgets and operating locations.

Note: The ALS-600 QSK modification discussed in the “Modifications” section of this

web site is applicable to this new version of the ALS-600, as well as the older ALS-600.

Supplemental Article – Control/Indicator Unit for the ARI-500

As discussed above, there are no ALS-600 status indicators on the ARI-500, and you

must switch your ALS-600 off to run bare-foot or check exciter drive power.

To remedy these “deficiencies”, I built a compact interface that plugs into the ARI-500

REMOTE A input that includes PWR, TX and O/L LEDs, and a STANDBY/OPERATE

switch. The circuit is shown in Figure 1. While I made my own RJ45 cable interface,

I’ve called out an RJ45 cable so you can just cut off the necessary cable length. The

cable length is non-critical, but it should extend just 3” from the box to the end of the

RJ45 connector if you want to mount the interface unit right on the ARI-500. All parts

(Table 1) are from All Electronics (www.allelectronics.com). The photos show the

internal wiring of the interface unit unit, and the unit mounted on the ARI-500 with

double-sided tape. Labeling was done using Casio “White-on-Clear” labeling tape.

Wiring of ARI-500 Interface Unit. Interface Unit on ARI-500.

J1-8

J1-1

1N4007

O/L (Red)

Figure 1: ARI-500 Interface Unit Schematic

4.7K

J1-3/4

STBY

OPR

PWR (Grn)

J1-2

TX (Yel)

4.7K

J1-7

RJ45 Panel (Socket) View