Samlexpower SEC-1212 Owner's Manual page 11

7. Following additional guidelines may be followed to reduce
the effects of RF noise:
a. Use additional appropriate AC radio frequency interference
(RFI) power line filter immediately before the ac input of the
power supply. Recommended: Corcom Inc. ( www.cor.com )
"Q" series. Filtered, ferrite coated cord set
(www.emceupen.com ) is another choice. These cord sets,
with integral line interference filters, reduce common and
differential mode interferences over a wide frequency range.
Because they are shielded, they are also effective against
radiated interferences. In addition to the built-in filter networks,
the cable conductors are coated with an RF absorbing ferrite
compound. This provides additional attenuation at high frequen-
cies that is lacking in most regular LC filters. The RF absorp-
tion of the ferrite-coated cable avoids resonance's at high
frequencies, reducing the conducted and radiated RF noises
even further
b. Use additional appropriate DC radio frequency interference
(RFI) power line filter immediately after the DC output of the
power supply. Recommended: Corcom Inc.(www.cor.com )
"DA" / "DC" series
c. Twist the positive and negative wires from the output of the
power supply to the radio
d. The DC side positive and negative outputs of these power
supplies are isolated from the chassis. As explained at para-
graph 6 above, the noise currents are filtered to the chassis
ground and the chassis ground is connected to the earth
ground through the earth ground pin of the AC power outlet
receptacle. Avoid connecting (referencing) the DC negative
output terminal of the power supply to the earth ground.
e. Connect a 1/4" wave length of wire on the negative terminal of
the power supply. Connect one end of the wire to the negatvie
terminal and leave the other end free. The wave length corre-
sponds to the wave length of the interfering frequency.
be practical for long wave lengths)
[ Formula: Wave length (Meters) = 300 / frequency in MHz ]
10.
(May not