Specifications

b. Use additional appropriate DC radio frequency
interference (RFI) power line filter immediately
after the dc output of the power supply. Recom-
mended: 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 paragraph 5 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 con-
necting (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 negative terminal and
leave the other end free. The wave length
corresponds to the wave length of the interfer-
ing frequency. (May not be practical for long
wave lengths)
[ Formula: Wave length (Meters) = 300 /
frequency in MHz
13.
OUTPUT CONNECTION:
28 VDC is supplied through pads under holes S5& S6.
Always ensure that the positive and negative connections
are secure and the screws are tightened properly. Loosely
tightened connections result in excessive voltage drop
and may cause overheated wires and melted insula-
tion.
Use 14AWG wire to connect any device to the power
supply module. This wire size is valid when the device is
within 4 ft. distance from the power supply module. Thicker
wiring will be required for longer distances.
Thinner wires will cause overheating and excessive
voltage drop.
Ensure that the AC power is switched off when any device
is being connected to the power supply module.
Do not allow the ends of the positive and negative wires to
touch each other
FUSE REPLACEMENT:
Ensure that the fuse is a 250V, 4A slow blow
ENVIRONMENT:
Do not expose power supply module to rain, snow or water
spray.
DIS-ASSEMBLY AND REPAIR:
The power supply module should be disassembled or
repaired by a qualified technician. Incorrect reassembly or
repair may result in a risk of electric shock or fire which
may result in personal injury and property damage.
2.