This small power supply offers in a small case everything the radio amateur needs. The output voltage is either switched to fixed 13.8V, or to a variable output voltage between 9 and 15V. The maximum current is up to 28A. This is sufficient for all 100W transceivers.

The built-in fan is temperature controlled. With little load the fan does not run at all, the PSU-1228 is absolutely quiet. Only with a longer and higher load the fan starts to run to cool the internal electronics. In cases where interferences occur, the PSU-1228 offers a control which shifts the frequency of the birdies, if required.

The back-lit instrument shows (selectable) either Voltage or Current. All controls are conveniently located on the front, the 230VAC and DC connectors are on the rear. The PSU-1228 has the same front panel size and layout as the well known SX- series SWR/power meters and so fits perfectly into the ham shack.

Input Voltage:    180 - 240 VAC
Output Voltage:    13.8V fixed or 9-15V adjustable
Output Voltage Regulation:    < 2%
Protection:    Short Circuit, limited to 28A
Output Current:    28A max., 20A continous
Ripple:    < 80mVpp at rated load
Fuse (Primary):    5A
Size (without controls):    155 x 70 x 205mm (WxHxD)
Weight:    ca. 1.5k