R.F. SYSTEMS - DX 500/ADAP - 220V A.C. TO 12V D.C. ADAPTER/POWER SUPPLY - LINEAR TYPE WITH PROTECTIONS

The 12 volts supply voltage for the DX 500 active antenna or other other ham radio antennas and accessories must be hum and
noisefree for optimum reception. 

With 12 V battery supply this is no problem, especially because all indoor units have built-in filters to reject hum and noise. 

But if a 12 V mains adapter is used, this filtering is sometimes not enough.

The mains adapter must deliver not more than 13,8 Volts dc, free from hum and noise.

Most low-cost unstabilized 12 V mains adapters give a higher output voltage with low current consumption.
They give also too much hum. It is an advantage if the power supply rejects also interference from the 230 V mains. 
Switching mode wallsocket mains adapters cannot be used with communications equipment! 
They give too much interference.
The DX 500/ADAP is a special stabilised, short-circuitproof mains adapter for the use of the 12 Volts DX 500 indoorunits on the
230 V ac mains. 
The DX 500/ADAP rejects interference from the mains, is double insulated and suited for continuous operation. 

• Input 210 – 240 Vac 50/60 Hz via a standard European 2 prong IEC mainsplug
• Output stabilized at 12 V dc, 300 mA max 
• Hum and noise rejection more than 70 dB. 

The output cord ends in a standard 2,1 x 5,5 mm plug which will fit directly to the DC input jack of the 12 V indoor units.