Xantech Stereo System XDT77 User Manual

XDT77  
AM/FM STEREO DUAL TUNER  
OWNER’S MANUAL  
Thank you for choosing XANTECH. Read this manual carefully to get the best performance from this unit.  
 
Contents  
Remote Control Unit  
The provided Remote Control Unit allows the unit to be operated  
froma distance.  
When operating the remote control unit, point it towards the  
REMOTE SENSOR on the front panel of the unit.  
Important Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Before Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Remote Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Names of Each Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Radio Reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Preset Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
• Even if the remote control unit is operated within the effective  
range, remote control operation may be impossible if there are  
any obstacles between the unit and the remote control.  
• If the remote control unit is operated near other appliances  
which generate infrared rays, or if other remote control  
devices using infrared rays are used near the unit, it may  
operate incorrectly. Conversely, the other appliances may  
operate incorrectly.  
Appendix  
A (RS-232 Commands). . . . . . . . . . . . . . . . . . . . . . . . 12  
Battery Installation  
Before Use  
Read this before operation  
• Choose the installation location of your unit carefully. Avoid  
placing it in direct sunlight or close to a source of heat. Also  
avoid locations subject to vibrations and excessive dust, heat,  
cold or moisture.  
• Do not open the cabinet as this might result in damage to the  
circuitry or electrical shock. If a foreign object should get into  
the set, contact your dealer.  
1
2
Remove the battery compartment cover.  
Insert two "AAA" (R03, UM-4) dry batteries. Make sure that the  
batteries are inserted with their positive " " and negative "  
poles positioned correctly.  
• When removing the power plug from the wall outlet, always  
pull directly on the plug, never yank the cord.  
"
• Do not attempt to clean the unit with chemical solvents as this  
might damage the finish. Use a clean, dry cloth.  
3
Close the cover.  
• Keep this manual in a safe place for future reference.  
Battery Replacement  
If the distance required between the remote control unit and  
main unit decreases, the batteries are exhausted. In this case  
replace the batteries with new ones.  
Maintenance  
If the surface of the unit gets dirty, wipe with a soft cloth or  
use diluted mild soap liquid. Be sure to remove any excess  
completely. Do not use thinner, benzine or alcohol as they may  
damage the surface of the unit.  
Precautions concerning batteries  
• Be sure to insert the batteries with correct positive " " and  
negative " " polarities.  
• Use batteries of the same type. Never use different types of  
batteries together.  
• Rechargeable and non-rechargeable batteries can be used.  
Refer to the precautions on their labels.  
CAUTION  
• When the remote control unit is not to be used for a long time  
(more than a month), remove the batteries from the remote  
control unit to prevent them from leaking. If they leak, wipe  
away the liquid inside the battery compartment and replace the  
batteries with new ones.  
The product shall not be exposed to dripping or splashing and  
that no object filled with liquids, such as vases, shall be placed  
on the product.  
• Do not heat or disassemble batteries and never dispose of old  
batteries by throwing themin a fire.  
Do not install this equipment in a confined space such as a  
book case or similar unit.  
3
 
Connection  
CAUTION  
Turn off the power of all the equipment before making connections.  
Read instructions of each component you intend to use with this unit.  
< Be sure to insert each plug securely. To prevent hum and noise, do not bundle the connection  
cords with the power cord.  
C
E
F
A B  
D
L R  
R
L
TUNER IN  
TUNER IN  
Amplifier  
Amplifier  
4
 
< If the AM loop antenna provided does not deliver sufficient  
reception (often due to being too far from the transmitter or  
in a concrete building, etc.), it may be necessary to use an  
outdoor AM antenna.  
Use either a high quality commercial AM antenna or, if not  
available, an insulated wire more than 15 ft (5 m) long, strip  
one end, and connect this to the terminal as shown.  
The antenna wire should be strung outdoors or indoors near  
a window. For better reception, connect the GND terminal to  
a reliable ground.  
A
FM Antenna  
Connect an outdoor FM antenna to the FM 75socket.  
Generally, a 3-element antenna will be sufficient; if you live  
in an area where the FM signals are particularly weak, it  
may be necessary to use one with 5 or more elements.  
If standard FM broadcast frequencies are available via your  
cable service, you may connect your 75 ohm FM antenna  
jack to your cable system. Please contact your cable  
service to discuss this option.  
Note:  
Even when using an outdoor AM antenna, do not disconnect  
the AM loop antenna.  
B
AM Indoor Loop Antenna  
The high-performance AM loop antenna provided with this  
unit is sufficient for good reception in most areas.  
To stand the loop antenna on a surface, fix the claw to the  
slot.  
1
2
Connect the loop antenna's wires to the AM antenna  
terminals as shown.  
How to connect  
Press the lever, insert the end of the cord, then release the  
lever. Make sure it is fastened securely by pulling the cord  
lightly. Make sure only the bare, stripped wire is inserted in  
the jack and that no plastic insulation is preventing contact  
between the antenna wire and terminal.  
C
AUDIO OUT  
Connect the component with RCA pin cords. Make sure to  
connect :  
white plug  
white jack(L:left)  
w
red plug  
red jack(R:right)  
w
D
Power cord (AC)  
Be sure to connect the power cord to an AC outlet which  
supplies the correct voltage.  
Hold the power plug when plugging or unplugging the power  
cord.  
Place the antenna on a shelf, for example, or hang it on a  
window frame, etc., in the direction which gives the best  
reception, as far away as possible from the entire system,  
speaker cords and the power cord, to prevent unwanted  
noise.  
E
F
REMOTE  
Used for a wired remote control unit (optional).  
RS-232  
Used for a wired RS-232 standard remote control unit  
(optional).  
5
 
Names of Each Control  
K
K
A B C  
D E F G H  
I
J
D E F G H  
I
J
Buttons for TUNER 1  
Buttons for TUNER 2  
C
J
I
H
F
G
G
E
J
D
I
H
F
E
D
6
 
A
B
REMOTE SENSOR  
When operating the remote control unit, point it towards the REMOTE SENSOR.  
STANDBY indicator  
This indicator lights when the unit is in the standby mode.  
When the unit is turned on, it goes off.  
C
POWER switch  
Press this switch to turn the unit on or off.  
The equipment draws nominal non-operating power from the AC outlet with  
its POWER switch in the OFF position.  
D
E
F
FM button, AM button  
Use these buttons to select FM or AM.  
FM MODE button  
Use this button to select stereo or monaural.  
PRESET button  
Use this button to select the preset tuning mode.  
G
DIRECT button  
Use this button to select the manual tuning mode.  
You can use the numeric buttons to directly input frequency numbers.  
H
I
MEMORY button  
Use this button to store preset channels into memory.  
TUNING/PRESET buttons  
Use these buttons to tune in a station.  
J
Numeric buttons  
These buttons are used either to input frequency numbers or to select preset  
stations.  
K
Display  
Note:  
To simplify explanations, instructions refer to names of buttons and controls on  
the front panel, making no mention of the use of remote control unit.  
7
 
Radio Reception  
B
Manual Selection  
(Selecting stations which cannot be tuned automatically)  
1
2
3
4
2
3
4
TUNER 1  
TUNER 2  
When the TUNING/PRESET button is pressed momentarily (0.5  
second or less), the frequency changes by a fixed step.  
FM : 0.2 MHz steps  
AM : 10 kHz steps  
1
Press the POWER switch to turn the unit on.  
Press the TUNING/PRESET button repeatedly until the station  
you want to listen to is found.  
C
Direct Tuning  
Input the frequency numbers with the numeric buttons.  
2
Select the AM or the FM band by pressing the corresponding  
button.  
Example  
To select FM 88.30 MHz : 8q8q3  
To select AM 1220 kHz : 1q2q2q0  
3
Press the DIRECT button to select the manual tuning mode.  
< When no button is pressed for 3 seconds, the mode will be  
cancelled.  
4
Select the station you want to listen to.  
FM MODE Button  
< "TUNED" is displayed when a broadcast is correctly tuned in.  
A
Auto Selection  
FM MODE  
(TUNER 1)  
FM MODE  
(TUNER 2)  
Pressing this button alternates between Stereo mode and  
Mono mode.  
Hold down the TUNING/PRESET button for 0.5 to 2 seconds.  
When a station is tuned in, the tuning process will stop  
automatically.  
Stereo  
FM stereo broadcasts are received in stereo and the  
"STEREO" indicator lights in the display.  
Mono  
If you want to stop the tuning process, press the  
TUNING/PRESET button.  
To compensate for weak FM stereo reception, select this  
mode. Reception will now be forced monaural, reducing  
unwanted noise.  
8
 
Preset Tuning 1  
5
5
4
2 5  
TUNER 1  
3
5
4
2 5  
TUNER 2  
3
5
1
1
5
While the MEMORY indication is flashing select the preset  
you would like to use for this station by EITHER:  
Manual Memory Presetting  
You can store your favorite FM and AM stations into any of the 30  
preset locations by:  
Scroll up or down using the TUNING/PRESET buttons until the  
preset is displayed. Then press the MEMORY button to store  
1
Select the AM or FM band by pressing the corresponding  
band button.  
2
3
Press the DIRECT button to select the “manual tuning” mode.  
OR enter the 2-digit preset number using the numeric pad. (For  
instance “05” will store the station in preset number 5. “25”  
will store the station in preset location 25.) The preset will  
automatically be stored and the memory indication will stop  
flashing.  
Select the station you would like to store by scrolling through  
the station using the TUNING/PRESET buttons or directly tune  
the station by using the numeric buttons.  
3
5
To store more stations, repeat steps  
through  
.
4
Once the station is tuned, press the MEMORY button.  
9
 
Preset Tuning 2  
Troubleshooting  
If you experience any problems with the unit, please take a  
moment to look through this chart and see if you can solve the  
problem yourself before you call your dealer or service center.  
No power  
eCheck the connection to the AC power supply. Check and  
make sure the AC source is not a switched outlet and that, if  
it is, the switch is turned on. Make sure there is power to the  
AC outlet by plugging another item such as a lamp or fan.  
1
2
3
1
2
3
TUNER 1  
TUNER 2  
Cannot listen to any station, or signal is too weak.  
eMake sure the antenna is properly connected.  
eTune in the station properly.  
How to select preset stations  
eIf a TV is near the unit, turn it off.  
eInstall the antenna again after relocating it to a better  
reception position.  
1
Select the AM or the FM band by pressing the corresponding  
button.  
eAn external antenna may be required.  
Though the broadcast is stereo, it sounds monaural.  
ePress the FM MODE button.  
2
Press the PRESET button.  
Remote control doesn't work.  
ePress the POWER switch to turn the unit on.  
eIf the batteries are dead, change the batteries.  
eUse remote control unit within the range (5m /15ft) and point  
at the front panel.  
eClear obstacles between the remote control unit and the  
main unit.  
eIf a strong light is near the unit, turn it off.  
3
Select a preset channel using the numeric buttons.  
If normal operation cannot be recovered, unplug the power cord  
from the outlet and plug it again.  
Or press the TUNING/PRESET button repeatedly until the  
desired preset station is found.  
Memory Backup  
Settings are stored permanently, even when power is turned off  
and the unit is unplugged.  
10  
 
Specifications  
FM Tuner Section (Without notes 98.1 MHz, 65 dBf)  
Tuning Range. . . . . . . . . . . 87.5 MHz – 107.9 MHz (200 kHz steps)  
Usable Sensitivity (IHF). . . . . . . . . . . . . . . . . . . . . . . . Mono: 15 dBf  
50 dB Quieting Sensitivity . . . . . . . Mono: 21 dBf , Stereo: 41 dBf  
Total Harmonic Distortion (1 kHz) . . . . Mono: 0.3%, Stereo: 0.4%  
Frequency Response . . . . . . . . . . . . . . . . . 30 Hz – 15 kHz, ±1.5 dB  
Stereo Separation (1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 dB  
Signal-to-Noise Ratio. . . . . . . . . . . . . Mono: 67 dB, Stereo: 63 dB  
AM Tuner Section  
Tuning Range . . . . . . . . . . . . . . 530 kHz – 1,710 kHz (10 kHz steps)  
Usable Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 dB/m  
Total Harmonic Distortion . . . . . . . . . . . . . . . . . . . . 1% at 85 dB/m  
Signal-to-Noise Ratio . . . . . . . . . . . . . . . . . . . . . . 40 dB at 85 dB/m  
General  
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . 120 V AC, 60 Hz  
Power Consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 W  
Dimensions (W x H x D) . . . . . . . . . . . . . . . . . . . 435 x 95 x 270 mm  
(17-1/8" x 3-3/4" x 10-5/8")  
Weight (net) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 kg (8-13/16 lbs)  
Standard Accessories . . . . . . . . . . . . . . . Remote Control Unit x 1  
Battery (AAA, R03, UM-4) x 2  
AM Loop Antenna x 1  
FM adapter x 1  
RCA Cord x 2  
< Improvements may result in specifications and features  
changing without notice.  
< Illustrations may differ slightly from production models.  
11  
 
Appendix A  
XDT77 DUAL AM/FM TUNER  
RS-232 COMMANDS  
PURPOSE:  
This document describes the RS-232 commands that will operate the XANTECH XDT77 Dual Tuner  
through the 9-pin RS-232 connector on the rear panel.  
General Information:  
Data Rate:  
Parity:  
19,200 baud  
None  
Word length:  
Handshake:  
Connections:  
8 data bits, 1 stop bit  
No RTS/CTS handshaking  
simple 3 wire (Rx, Tx, Gnd) interface  
DATA ENTRY PROTOCOL:  
The serial buss should follow a standard serial  
communications protocol using Line oriented ASCII data  
stream. The command line must be followed with a  
carriage return for the unit to respond. The unit should  
not echo characters received back to the host.  
Command Codes:  
Character  
Range  
0,1  
1,2  
Function  
Power Off / On  
Tuner #  
Example  
X:  
T:  
B:  
P:  
F:  
A:  
M:  
S:  
X1 = Power On, X0 = Power Off  
T1 = Tuner 1, T2 = Tuner 2  
B1 = AM, Band 2 = FM  
1,2  
Band #  
Preset #  
00 - 30  
4 numbers  
0,1  
P01 = Preset 1, P30 = Preset 30, P00 (just for status) = No Preset Selected  
F0890 = 890 AM, F1045 = 104.5 FM  
Frequency Setting  
Seek Up / Down  
Step Up / Down  
1 = locked, 0 = not  
1 = stereo, 0 = mono  
ask for tuner status  
A0 = Seek Down, A1 = Seek Up  
0,1  
M0 = Step Down 1 step, M1 = Step Up 1 step  
S00 (just for status) = no signal, no stereo, S01 = invalid  
S10 = signal lock (mono), S11 = signal lock (stereo)  
Q1 = Status of Tuner 1, Q2 = Status of Tuner 2  
Q3 = Status of both tuners, 1 then 2  
Signal Lock /  
Stereo Presence  
Query status  
of tuner  
0,1  
Q:  
N:  
L:  
Preset Step Up / Down  
Set Preset  
N0 = Step Down 1 Preset, N1 = Step Up 1 Preset  
L01 = Set Station as Preset #1  
01 - 30  
Command Examples:  
T1B2P01<cr> would command tuner #1 to select band 2 (FM) and tune to FM preset #1  
T2B1F1070L03<cr> would command tuner #2 to set AM frequency 1070 kHz as AM preset #3  
This command however, would not change the current station tuned on Tuner #2  
To select a station to be tuned and THEN set that station as a preset, would require two commands:  
T2B1F1070<cr> would command tuner #2 to select band 1 (AM) and tune to frequency 1070 kHz.  
T2L03<cr> would command tuner 2 to set the currently tuned station (in this example AM 1070) as AM preset #3  
Query Example:  
Q1<cr> would solicit the following response:  
Feedback as to the status of tuner #1, which would include band select, station preset, frequency  
tuned, signal lock and stereo presence. The response string would look like this:T1B2P00F1011S11  
T1 (tuner 1) B2 (FM), P00 (no preset selected), F1011 (frequency 101.1 MHz), S11 (signal lock & stereo)  
Shortcut Commands:  
Note: examples below are assuming Tuner 1 is in FM stereo mode and tuned to a station  
Command Response/Action  
T1N1<cr> Tuner 1 would step up to the next higher preset number  
T1L01<cr> Tuner 1 would set the currently tuned station as FM preset #1  
T1S10<cr> Tuner 1 would switch the FM mode to mono  
T1M1<cr> Tuner 1 would step up the frequency 0.2 MHz  
T1A0<cr> Tuner 1 would go into "seek down" mode  
T1B1<cr> Tuner 1 would go to AM mode and tune to the last previously tuned AM station  
12  
 
AM/FM STEREO DUAL TUNER  
This appliance has a serial number located on the rear panel. Please record  
the model number and serial number and retain them for your records  
Model number:  
Serial number:  
XDT77  
Xantech Corporation 13100 Telfair Avenue, Second Floor Sylmar, CA 91342-3573 Sales: 800.843.5465 Fax: 818.362.9506  
Thank you for choosing XANTECH. Read this manual carefully to get the best performance from this unit.  
 

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