XHDATA D-808 User manual

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XHDATA D-808
FM Stereo/LW/MW/SW-SSB AIR RDS
Digital Signal Processing Receiver
A User’s Manual
By Kevin Davidson
Illustraons by XHDATA

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Table of Contents
Radio - Front View 3
The Display 4
Side Controls 5
Radio Rear 6
Warnings 7
Quick Start Guide 7
Funcons and Operaon 8
Power and Charging 8
Power on Buon and Sleep Timer 8
Alarms 8
Charging the Radio 9
Operaons and Setup 9
FM Tuning Range 9
Longwave Setup 9
Medium Wave step 9
Beep 9
Temperature 10
Seng the Clock 10
Lock 10
Display Light 10
Memory System 11
Auto Tune Storage (ATS) 11
Antennas 11
Display Mode 12
Bandwidth 12
Tuning Speed 12
FM Recepon 13
FM RDS (radio data system) 13
MW (medium wave) 14
LW (longwave) 14
SW (shortwave) 15
Single Sideband (SSB) 16
AIR Band 16
Squelch 17
Reset 17
Specicaons 18

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4
The Display
1. Baery charge indicator
2. Sleep mer acve
3. Key press beep acve
4. Alarm on
5. Frequency Display is kHz or MHz
6. Display temperature mode
7. Signal strength
8. Noise level
9. Band selecon
10. FM Stereo signal
11. FM RDS available
12. Frequency
13. RDS Informaon
14. USB / LSB mode
15. Squelch acve (AIR band only)
16. Alarm acve
17. Display shows Memory locaon
18. Not available on this radio
19. Radio keys locked
20. Tuning knob speed

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Side Controls
21. External Antenna Jack (3.5mm)
22. Volume control
23. Headphone jack (3.5mm stereo)
24. Main Tuning knob (push in for fast/slow/stop)
25. Fine tuning / clarify control for SSB
26. USB Charging port
27. Radio reset buon access hole

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Radio rear
28. Whip antenna used for FM, SW and AIR bands
29. Kickstand
30. Baery door (18650 baery (included)

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Warnings
• Do not expose the radio to water, moisture or excessive humidity.
• Keep radio out of the freezer. Operang temperature range is 0° - 40° C (32° -
104° F).
• Clean with a dry cloth. Don’t use detergents or chemical solvents.
• Do not aempt to open the unit, unless you are really curious. You might break
something.
• Change the baery within one minute to avoid loss of me and other sengs.
Quick Start Guide
1. The radio is shipped with a protecve tab in the baery compartment that
prevents the baery from contacng the baery terminal. Carefully remove
the baery door (back of radio) and remove the baery and the tab. Replace
the baery taking care to align the polarity of the baery (+/-) to match the
diagram on the back of the radio. Replace the baery door.
2. Turn the radio on by pressing the orange power buon on the upper right cor-
ner of the radio.
3. Select a radio band — FM, MW, SW or AIR — then raise the volume with the
knob on the le side of the radio. Increasing volume is in the upward direcon.
4. Tune the radio by rotang the tuning knob on the upper right side of the radio.
Clockwise is increasing frequency. To tune to a staon directly, press the FREQ
buon, then the frequency. If the radio does not tune to the frequency, press
FREQ again to complete the entry.

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Funcons and Operaon
Power and charging
Power On Buon and Sleep Timer
In this manual, the terms “press” and “long press” are used. Press means to press
the buon briey. Long press means to press the buon and hold it for 2 seconds.
The orange power on buon turns the radio on. For 5 seconds, the sleep mer icon
appears on the display ashing. While the sleep mer icon is ashing, further press-
es of the Power buon increment through a list of sleep mes from 120 to 15
minutes or “on” indicang the mer is disabled. When the sleep mer is set, the
radio will automacally power o aer the selected number of minutes. The radio
cannot be turned o while the sleep mer icon is ashing — just wait unl it stops.
The sleep mer seng can be disabled by simply turning the radio o.
Alarms
The radio can automacally power on based on the alarm seng. Alarm mode can
be set on or o with the ALARM buon.
To turn the alarm on or o, turn o the radio and press the ALARM buon. Use the
up arrow buon to toggle through the three alarm modes: Wake to radio, wake to
tone and o. The alarm mode is indicated on the display with a ny speaker symbol
to the right of the word “Timer” for wake to radio, a ny bell to indicate wake to
tone, or no symbol when the alarm is o. Alarm to radio uses the most recently
tuned staon.
To set the alarm me, long-press the ALARM buon and key in the me with the
number buons. For example, to set the alarm for 21:30, long press the ALARM
buon and key 2 1 3 0. The alarm is set at the factory for 7:00 AM, turned o. The
radio does not support a 12-hour clock.

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Charging the radio
To charge the radio, plug a USB-C cable (included) into the USB jack on the right
side of the radio. (Some early versions of the radio use a USB Micro connector.) The
baery icon will cycle while the radio is charging. Charging will stop when the
baery is fully charged or aer 10 hours, whichever is rst. Note: some early ver-
sions of the radio may require long pressing the SSB buon to begin charging.
Opons and setup
FM Tuning range
The radio can be set for dierent tuning ranges that are convenient for FM broad-
casng in dierent regions of the world. With the radio o, long-press the FM
buon. The current seng, showing the lowest frequency of the band, is displayed.
To change the seng, press the FM buon again to cycle through the three op-
ons:
• 64.0 MHz
• 76.0 MHz
• 87.5 MHz
Longwave
The LW band is not enabled by default. To enable it, turn the radio o and long-
press the LW/MW buon. The radio will display the current status of the seng,
“LW ON” or “LW OFF.” To change the seng, press the LW /MW buon. When LW
is on, pressing the LW/MW selects either LW or MW. When it is o, the LW opon
is not available.
Medium Wave Step
The tuning step for medium wave (MW) can be set for 9 kHz or 10 kHz. To change
the seng, turn the radio o and long-press the 9/10 kHz buon (0). The current
seng is displayed. Press the buon again to cycle through the two opons. 10 kHz
us used in the Americas and 9 kHz in the rest of the world.
Beep
The radio as it comes from the factory beeps aer each key press. To disable this,
turn the radio o and long-press the BEEP buon (5). Unlike other opons, mulple

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presses of the buon do not toggle the opon. Long press the key to change it.
Temperature
The temperature scale for display, Fahrenheit or Cengrade, may be selected. With
the radio o, press the DISPLAY buon unl the temperature is displayed, then long
-press the number 3 to change the seng. Repeatedly press the buon to toggle
between F and C.
Seng the clock
The radio clock only supports 24-hour me display only.
To set the clock, turn the radio o and long press TIME SET. The radio will display
“TIME.” Key in the 4-digit me to set. To set the seconds, wait unl about 7 seconds
before the 00 minute, then acvate the me funcon, quickly key in the me and
then press TIME again. Note that me seng mode automacally exits aer about
4 seconds with no key pressed.
The radio has the opon to automacally set the me from an FM broadcast staon
the provides it (refer to the RDS topic for more on this). To enable automac seng,
press the TIME SET buon with the radio o. Use the up arrow key to toggle be-
tween Auto and Manual modes. Note: many FM staons to not broadcast me, and
those that do may not be accurate. You must tune the staon with that informaon
for the me to be set.
Lock
With the radio on or o, long press the INFO buon to disable the keys on the radio.
Long press again to re-enable them. This feature is useful to prevent the radio from
being turned on accidentally during handling or when packed.
Display light
The display is automacally illuminated for about 10 seconds when you press a key
or turn the tuning knob. Pressing the LIGHT buon turns it on indenitely. When
set, the light stays on even when the radio is turned o.

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Radio operaon
Memory System
This radio has 500 memory locaons, 100 for each band, organized into 10 pages
with 10 memory locaons each. A memory locaon stores the staon frequency
along with the stereo seng for FM and the bandwidth for LW/MW/SW.
Select the desired band (MW, LW, FM, SW and AIR) rst. Then to save or retrieve a
staon in memory, rst establish the current memory page by pressing the PAGE
buon and then press the page number buon (0-9).
Once a page is selected, a frequency is stored to a memory locaon within the page
by long-pressing the posion number buon (0-9). To recall a saved staon, just
press the number buon (0-9) of the memory posion within the current page.
Auto Tune Storage (ATS)
This radio has the capability to scan the bands and automacally store staons into
memory. It loads them sequenally by page, and by posion within the page, over-
wring any previously stored staons. ATS is invoked by rst selecng the band and
then with a long press of the band buon, FM, LW/MW, SW or AIR. ATS stores rela-
vely stronger staons, and may skip some that are audible. Also, parcularly on
shortwave, the signal strength may fade in and out, causing the staon to be
skipped. For AIR trac, transmissions are oen short and may not be acve when
the radio scans a parcular frequency.
Also note that for shortwave, the radio only scans within the internaonal broad-
cast frequencies, not amateur radio or commercial bands. Refer to the SW topic.
Antennas
Antennas capture radio signals that are processed by the radio. This radio has 3
antenna opons:
• Internal ferrite bar antenna used for LW/MW
• A 25.5” telescopic whip antenna for SW/FM/AIR
• A 3.5mm jack to connect an external antenna of your choice for SW, .FM, AIR
Cauon: Ensure that an external antenna is clear from power lines.

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The internal ferrite bar antenna is direconal. Physically turn the radio for best re-
cepon. You may nd that moving the radio to a dierent locaon, even slightly,
greatly improves recepon on all bands.
AM recepon can oen be improved by placing a passive loop antenna next to the
radio. Even 10-20 feet of wire can make a big dierence on shortwave.
Display Mode
The display can be set to show dierent informaon, press the DISPLAY buon to
cycle between signal strength/signal to noise rao, me, temperature and alarm
me.
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 indicang 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. Somemes two staons 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 buon. The width is shown on the display, and repeated presses of the buon
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
beer the audio delity 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

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FM Recepon
To receive FM broadcasts, fully extend the whip antenna and press the FM buon.
Here are your tuning opons.
1. Press FREQ, enter the frequency of the staon, and press FREQ again.
2. Long press the FM buon to acvate ATS to store all strong staons into
memory (see secon on the Memory system for how to access them).
3. Press the up or down arrow keys to go to the next frequency.
4. Long press the up or down arrow to scan for the next strong staon.
5. Rotate the tuning knob to tune staons.
Some FM staons broadcast in stereo. In this case, STEREO appears on the display.
Listening to the two stereo channels requires headphones. Stereo can be turned o
and on with the FM ST buon. It may be automacally disabled for a weak signal. In
some situaons, you may get improved recepon by turning stereo o. The stereo
seng is stored in the staon memory when the frequency is saved.
FM RDS (radio data system)
RDS is a means for FM radio staons to transmit data along with their program-
ming. Not all FM staons employ RDS, but the ones that do typically transmit the
staon name, the staon type, the song arst and tle when playing music, and
occasionally the me. When RDS is present, the RDS icon on the display is shown
and the RDS data informaon appears at the boom of the display. Use the INFO
buon to cycle through the RDS data opons. This radio supports the following RDS
informaon:
• PS—Program Service Name
• DATE—Date and Time (“NO DATE” of not present)
• PTY—Program type: News, Drama, Rock music… (“NONE” if not present)
• RT— Radio Text may contain arst and tle informaon for music (“NO RT” if
not present)
RDS date informaon can be used to automacally set the radio clock. Refer to the
Clock Seng topic for addional informaon. MW (medium wave)

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To receive MW broadcasts, press the LW/MW buon. Here are your tuning op-
ons.
1. Press FREQ, enter the frequency of the staon, either 3 or 4 digits.
2. Long press the LW/MW buon to acvate ATS and store all strong staons
into memory (see secon on the Memory system for how to access them).
3. Press the up or down arrow keys to go to the next frequency.
4. Long press the up or down arrow to scan for the next strong staon.
5. Rotate the tuning knob to tune staons.
Rotate the radio for the best recepon. Refer to the Antenna topic for more infor-
maon.
LW (longwave)
Longwave recepon is not enabled from the factory. Refer to the Sengs topic for
how to enable it. Pressing the LW/MW buon when longwave is enabled switches
between the two bands. The display shows which is selected.
Here are your tuning opons.
1. Press FREQ, enter the frequency of the staon.
2. Long press the LW/MW buon to acvate ATS to store all strong staons into
memory (see Memory system topic for how to access them).
3. Press the up or down arrow keys to go to the next frequency.
4. Long press the up or down arrow to scan for the next strong staon.
5. Rotate the tuning knob to tune staons.
Rotate the radio horizontally for the best recepon. Refer to the Antenna topic for
more informaon.

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SW (shortwave)
Fully extend the whip antenna and press the SW buon to selects the shortwave
funcon and tune to the previously accessed shortwave frequency. Repeated press-
es of the buon cycle through the 14 internaonal shortwave broadcast bands The
display shows which meter band is selected briey aer the buon is pressed. The
bands are:
• 120m (2300 - 2495kHz)
• 90m (3200 - 3400 kHz)
• 75m (3900 - 4000 kHz)
• 60m (4750 - 4995 kHz)
• 49m (5730 - 6200 kHz)
• 41m (7100 -7450 kHz)
• 31m (9250 -9900 kHz)
• 25m (11500 - 12100 kHz)
• 22m (13570 - 13870 kHz)
• 19m (15300 - 15830 kHz)
• 16m (17480 - 17900 kHz)
• 15m (18900 - 19020 kHz)
• 13m (21450 - 21850 kHz)
• 11m (25670 - 26100 kHz)
Note: The band ending frequencies are approximate.
Here are your tuning opons.
1. Press FREQ and enter the frequency of the staon. You may need to press FREQ
again to complete.
2. Long press the SW buon to acvate ATS to store all strong staons into
memory (see Memory System topic for how to access them). Note that only the
staons within the 14 internaonal shortwave bands are scanned.

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3. Press the up or down arrow keys to go to the next frequency.
4. Long press the up or down arrow to scan for the next strong staon. Note that
only the 14 internaonal shortwave bands are scanned.
5. Rotate the tuning knob to tune staons.
Posion the radio for the best recepon. Refer to the Antenna topic for more infor-
maon.
Single Sideband (SSB)
SSB is a transmission method used by amateur radio and commercial radio services.
It reduces the power requirements and improves recepon, but it requires special
receiving equipment. Most voice transmissions on the amateur radio bands are
SSB, and you can recognize it by a highly distorted and punctuated sound for voice.
To receive SSB on this radio, rst tune the staon as best you can. Then press the
SSB buon. Aer some delay, the display will show the sideband seng, either
upper sideband (USB) or lower sideband (LSB). In SSB mode, the INFO buon
switches between the two sidebands. LSB is most oen used for frequencies below
7300 kHz and USB for those over 14000 kHz, with excepons.
Use the ne tuning knob (+/- 990 Hz in 10 Hz steps) on the le side of the radio for
the best sound. Be paent; SSB tuning takes pracce .
Refer to the Bandwidth topic for how to improve shortwave recepon.
AIR Band
To receive aviaon transmissions, fully extend the whip antenna and press the AIR
buon. Here are your tuning opons.
1. Press FREQ, enter the frequency of the staon, and press FREQ again if neces-
sary.
2. Long press the FM buon to acvate ATS to store all strong staons into
memory (see secon on the Memory system for how to access them).
3. Press the up or down arrow keys to go to the next frequency.
4. Long press the up or down arrow to scan for the next strong staon.
5. Rotate the tuning knob to tune staons.

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Air band is best received near airports. You can look up the approach frequency for
your closest airports online and set the radio for these frequencies.
Squelch
Air band on this radio has a special feature called “squelch.” When set, the radio
remains silent unl a staon stronger than the set level is received. To acvate the
feature, long press the tuning knob in towards the radio, and when the word
“Squelch” appears in the display immediately rotate the tuning knob to set the
squelch level. The values are 1-9 and OFF. The opmum level is usually the highest
number without background noise. Turning squelch o may enable recepon of
weak signals that would otherwise not be heard.
Reset
Should the radio become inoperable, you may aempt to reset the radio by push-
ing a small object such as a toothpick or paperclip into the Reset hole unl you feel
a click. Take care not to press too hard and damage the radio.

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Specicaons
Radio bands
• FM: 64 - 108 MHz
• MW: 520 - 1710 kHz
• SW: 1711 - 29999 kHz
• LW: 150 - 450 kHz
• AIR: 118 - 137 MHz
Sensivity:
• FM: > 3 µV
• MW: > 0.5 mV/m
• LW: > 10 mV/m
• SW: > 10 µV
• AIR: > 0.5 µV
AM Selecvity: > 80dB
Number of memories: 500 (100 per band)
Baery: 1 x 18650
DC input voltage: 5V
Power consumpon : 140 µA o, 120 mA at maximum volume
Speaker: 8Ω 1 W
Earphone Jack: 3.5mm stereo
Dimensions: 157(W) x 92(H) x 32(D) mm
Weight: 265g (without baery)
Accessories: Earphone, storage bag, external antenna, USB-C charging cable, 18650
baery, English user manual