XHDATA D-808, User Manual, Page: 12 / 18

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The internal ferrite bar antenna is directional. Physically turn the radio for best re-
ception. You may find that moving the radio to a different location, even slightly,
greatly improves reception on all bands.
AM reception can often be improved by placing a passive loop antenna next to the
radio. Even 10
- 20 feet of wire can make a big difference on shortwave.
Display Mode
The display can be set to show different information, press the DISPLAY button to
cycle between signal strength/signal to noise ratio, time, temperature and alarm
time.
Signal strength is expressed in dBu units, the larger the number, the stronger the
signal. The signal to noise radio is expressed in dB units; the larger the number, the
greater the signal quality, with a value of 0 indicating that signal and noise are
equal. The value is also shown as 0 when there is no signal at all.
Bandwidth
While radio signals are centered on one frequency, they actually occupy a range of
frequencies. Sometimes two stations with adjacent frequencies can interfere with
each other. This problem can be lessened by reducing the frequency range
(bandwidth) the radio tunes. This feature is available on LW, MW and SW on this
radio, but typically only used on SW. The bandwidth is selected by pressing the AM
BW button. The width is shown on the display, and repeated presses of the button
will cycle through the values: 6, 4, 3, 2.5, 2, 1.8 and 1 kHz. The bandwidths in SSB
mode are 4, 2, 2.2, 1.2, 1, and 0.5 kHz. Generally, the higher the bandwidth, the
better the audio fidelity and the lower the bandwidth, the lower the interference
and noise.
Tuning speed
The tuning knob has fast, slow and stop modes. Switch between them by pressing
the tuning knob in towards the radio. The display shows the mode in small print.
•
Fast - advance 10 kHz (3 kHz on LW, 9/10 kHz on MW, 25kH on AIE and 100
kHz on FM)
•
Slow - advance 1 kHz (10 kHz on FM)
•
Stop - does not advance