6.
Following additional guidelines may be followed to reduce the ef-
fects 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” se-
ries. 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 ab-
sorbing ferrite compound. This provides additional attenuation at
high frequencies that is lacking in most regular LC filters. The RF
absorption 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 sup-
ply.
Recommended:
Corcom Inc.(www.cor.com ) “DA” / “DC”
series
c.
The positive and negative terminals of the dc output side of the
power supply are isolated from its chassis. As pointed out at para
5 above, all the noise currents that are internally filtered are by-
passed to the chassis of the power supply and onward to the
earth ground of the 230 VAC system through the earth ground
pin of the power cord. Therefore, the negative terminal of the
power supply should never be connected / bonded to the chassis
of the power supply.
d.
Twist the positive and negative wires from the output of the
power supply to the radio
6.