— 10 —
AC Mains Power
The SOFIA 568 is provided with an external, inline ‘universal’
switching power supply that accommodates mains voltages be-
tween 88VAC and 264VAC. Self-protection circuits obviate the
need for an external fuse.
The power supply has a detachable IEC-type power cord fitted
with a North-American-standard male plug. If you need to re-
place the mains plug with another, you will find that the indi-
vidual cord conductors are color-coded in one of two ways. US
standards specify black for AC ‘hot,’ white for AC neutral and
green for earth ground. European CEE standards specify brown
for AC ‘hot,’ blue for AC neutral and green with a yellow stripe
for earth ground. Please don’t mix these up.
Radio Frequency
Interference
(RFI)
Although it is expected that the SOFIA 568 will be co-located
with other radio equipment, do practice care and common
sense in locating the unit away from
abnormally
high RF fields.
Ground Loops
A mains frequency or RF ground loop could possibly be formed
between cable shield grounds and the AC power cord ground.
If hum or other constant noise is noted, a ‘ground-lifting’ AC
adapter may remedy the problem, although the chassis must
somehow be returned to earth ground for safety. The optional
rack-mount chassis should satisfy this requirement.
INPUTS, OUTPUTS AND PORTS
Antenna
Input and
Considerations
The rear-panel
ANTENNA
connector is a female, 75-ohm BNC
connector. While the BNC may be an atypical antenna connect-
or, it is nonetheless ubiquitous worldwide, and adapters to
other connector types are readily available.
Many factors will guide your selection of an antenna, not the
least of which is the level and purity of the available off-air sig-
nal. Although the selectivity of the SOFIA 568 is remarkably
good, it’s not impossible that a band-pass or band-stop filter
may be required for situations where the receiver is co-located
with high power FM transmitters.
Analog
Line Outputs
Male XLR left- and right-channel
ANALOG OUTPUTS
on the rear
panel are electronically-balanced. This means that they are
ground-referenced and
not
transformer-isolated.
Analog line outputs may be adjusted under the front-panel
Set-
up / Audio Outputs / Analog Level
menu. These may be set to any
level between
–15dBu
and
+15dBu
, corresponding to 100% mod-
ulation. The dB levels shown beside the slider control repre-
sent the
unloaded
output level. These outputs have a resistive
source impedance of 200 ohms. Feeding a 600-ohm-terminated
load will drop the actual dBm level 2.5dB below the figure
shown by the slider.
Summary of Contents for HD Radio SiteStreamer+ SOFIA 568
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