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Chronosette-276
User Manual
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Radio Shack Chronosette-276 User Manual

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Chronosette-276 (120-1584) Features Faxback Doc. # 3767
The Chronosette-276 AM/FM Clock Radio offers you all the features of a dual alarm clock, an AM/FM stereo radio, and a tape player/recorder in one convenient package. You can record from the radio in mono or stereo, or you can make live stereo recordings using the built-in microphone.
Other features include:
Lighted Dial - makes tuning easy, even in low light.
Fluorescent Digital Display - makes the clock easy to read.
Sleep Feature - plays the radio or tape for up to 59 minutes before it automatically shuts off.
Snooze Timer - temporarily silences the buzzer, radio, or tape alarm so it sounds again in about 7 minutes.
Back-Up Battery - keeps the clock and alarm running for up to 8 hours if power is interrupted.
Battery Sentinel - lets you know when it is time to replace the back-up battery.
One Button Record - records with the press of a single button.
Full Auto-Stop - saves battery power and reduces tape wear by turning off the motor and releasing the tape-handling parts when the tape reaches its end.
Beat-Cut Switch - reduces interference when you record from a live AM radio broadcast.
External Antenna Terminals - let you connect an external FM antenna for optimum reception.
Variable Alarm Control - sets the alarm volume to a comfortable level.
Chronosette-276 (120-1584) Preparation Faxback Doc. # 3768
CONNECTING TO AC POWER
Plug the power cord into a standard AC outlet.
INSTALLING THE BACK-UP BATTERY
To keep the clock running in the event of an AC power failure, install a 9-volt battery. We recommend Radio Shack's Enercell battery Cat. No. 23-583. A fresh battery can keep the clock running for up to 8 hours and sound the alarm for up to 10 minutes if AC power fails.
Notes: An extra-life battery works best with the battery sentinel feature.
To prevent unnecessary drain on the backup battery, install the battery after you plug in the AC power cord.
If the display flashes after an AC power failure, the battery is too low to accurately run the clock. Replace the battery and reset the clock.
Follow these steps to install the back-up battery.
2. Place the battery connector over the battery contacts.
3. Replace the battery compartment cover.
If the BATTERY SENTINEL indicator lights, replace the battery.
CONNECTING AN EXTERNAL FM ANTENNA
You can connect an external FM antenna (not included) to the Chronosette-276 for improved FM reception. Your local Radio Shack store has a complete line of external antennas to choose from.
To connect an external FM antenna to the Chronosette-276, slightly loosen the 2 screw terminals and slide the antenna's spade lugs underneath the screw heads. Then, tighten the screws.
Chronosette-276 (120-1584) Operation Faxback Doc. # 3769
PLAYING THE RADIO
Follow these steps to play the radio.
1. Set function selector to RADIO.
2. Press RADIO ON to turn on the radio.
3. Set AM/FM/FM STEREO to AM or FM STEREO.
Notes: The Chronosette-276 has two antennas. The AM antenna is built in. Turn the Chronosette-276 to improve AM reception. For best FM reception, fully extend the telescoping antenna and adjust it to the position that provides the best reception.
The FM indicator lights when you receive an FM stereo station.
To improve reception for weak FM radio stations, set AM/FM/FM STEREO to FM. The sound changes from stereo to monaural (mono), but the sound quality improves.
4. Turn TUNING to the desired frequency.
5. Adjust VOLUME for a comfortable listening level.
6. Adjust BALANCE and TONE for optimum sound.
7. To turn off the radio, press RADIO OFF or slide the function selection to OFF.
USING THE SLEEP FEATURE
You can set the radio to play up to 59 minutes and automatically turn off so you can fall asleep as you listen.
Follow these steps to use the sleep feature
1. Set OFF/RADIO/ALARM to RADIO.
2. Press SLEEP. 00:59 shows on the display.
To set the playing time for less than 59 minutes, hold down the SLEEP button..
4. Release SLEEP.
CASSETTE OPERATION
You can play a cassette, record from the radio, or make the live recordings.
LOADING A CASSETTE TAPE
Follow these steps to load a cassette tape.
1. Use your finger or a pencil to turn the cassette's hub and take up any tape slack.
2. Press STOP/EJECT to open the cassette compartment door.
3. Load the cassette with its open edge up and the full reel to the right. The side facing you is the side that plays.
4. Close the cassette compartment door.
PLAYING A CASSETTE TAPE
Load a cassette as described in "Loading a Cassette Tape." Then follow these steps to play the tape.
1. Press RADIO ON.
2. Set the function selector to TAPE.
3. Press PLAY.
4. Adjust VOLUME for a comfortable listening level.
5. Adjust BALANCE and TONE for optimum sound.
To rewind or fast-forward the tape, press REWIND or FAST-F. Press
STOP when you reach the desired section. Press PLAY to resume normal play.
To temporarily stop play, press PAUSE. To resume play, press PAUSE again.
Press STOP/EJECT to stop the tape. Press STOP/EJECT again to open the cassette compartment.
Note: When the tape reaches the end, the Chronosette-276 automatically stops and releases the tape-handling parts.
USING THE SLEEP FEATURE TO PLAY A CASSETTE TAPE
1. Set the function selector to TAPE.
2. Load a cassette tape. (See "Loading a Cassette Tape."
3. Set the sleep time as described in "Using the Sleep Feature."
4. Press PLAY. The tape plays for the set time period and automatically turns off.
To manually stop the tape, press STOP/EJECT. When the tape reaches the end, the Chronosette-276 automatically stops and releases the tape-handling parts.
RECORDING WITH THE BUILT-IN MICROPHONE
You can make live recordings with the built-in microphone. Follow these steps to make a live recording.
Note: Before you record, be sure the erase-protection tabs are in place on the cassette tape. To prevent erasing the cassette tape accidentally, remove the erase-protection tabs.
1. Set the function selector to TAPE.
2. Load a blank cassette tape in the cassette compartment.
3. Press RADIO ON.
4. Press RECORD to start recording. RECORD and PLAY lock down.
Press STOP/EJECT to stop recording. RECORD and PLAY release.
Press STOP/EJECT again to open the cassette compartment door.
Note: When the tape reaches the end, the Chronosette-276 automatically stops and releases the tape-handling parts.
RECORDING FROM THE RADIO
Follow these steps to record radio broadcasts.
1. Set the function selector to RADIO.
2. Set AM/FM/FM STEREO to the desired band.
3. Adjust TUNING to the desired frequency.
4. Load a cassette tape in the cassette compartment.
5. Press RECORD to start recording. RECORD and PLAY lock down.
Note: You might hear a pulsating beat in the background of some AM radio recordings. To eliminate the beat, set BEAT CUT before you record form the AM band. First, record a short segment and play it back to listen for the beating sound. If you hear the beat, set BEAT CUT to its other position and resume recording.
6. Press STOP/EJECT to stop recording. RECORD and PLAY release.
Press STOP/EJECT again to open the cassette compartment.
Note: When the tape reaches the end, the Chronosette-276 automatically stops and releases the tape-handling parts.
RECORDING FROM THE RADIO WHILE AWAY
Follow these steps to record a radio program while you are out.
1. Set the time you want to begin recording as described in "Setting An Alarm."
2. Set the function selector to RADIO.
3. Set OFF/RADIO/ALARM to RADIO.
4. Press RECORD. At the set time, the radio begins to play and the recorder begins recording. The radio plays for 59 minutes, then automatically turns off. The tape automatically stops when it
reaches the end.
ALARM CLOCK OPERATION
SETTING THE TIME
Follow these steps to set the time.
1. Press and hold down TIME SET.
3. Release TIME SET.
SETTING AN ALARM
The Chronosette-276 has two alarms. You can set the alarms so the buzzer, radio, or tape player turn on at the specified times.
Follow these steps to set ALARM 1.
1. Press and hold down ALARM SET
The display shows the current alarm time setting and the AM/PM indicator.
2. While holding down ALARM SET 1, press the appropriate FWD or REV button to set the alarm time.
3. Release ALARM SET 1.
4. Set OFF/RADIO/ALARM as follows:
ALARM - the buzzer sounds at the set alarm time.
RADIO - the radio or tape player sounds at the set alarm time. The alarm indicator lights.
5. Set RADIO/TAPE (RADIO OFF) as follows:
RADIO - to turn on the radio.
TAPE - to play a tape
6. To set ALARM 2, repeat steps 1 through 5, using ALARM 2 where
appropriate.
At the set alarm time, the alarm, radio, or tape player sounds for 59 minutes, then automatically turns off.
Note: The tape automatically stops if it reaches the end before the 59 minutes pass.
You can manually silence the alarm before the 59 minutes pass as follows:
Buzzer Alarm - set OFF/RADIO/ALARM to OFF, and then back to ALARM
Radio Alarm - press RADIO OFF
Tape Player - press RADIO OFF
The alarm will repeat after 24 hours. To silence the alarm and turn off the alarm feature, set OFF/RADIO/ALARM to OFF.
USING THE SNOOZE FEATURE
To temporarily silence the buzzer, radio, or tape player so it sounds, press SNOOZE.
Chronosette-276 (120-1584) Hints and Tips Faxback Doc. # 3770
Erase Protection Tabs
Most cassette tapes have two erase-protection tabs-one for each side of the tape. When a tab is in place, you can record on that tape side. When the tab is not in place, you cannot record on that side.
To protect your recordings from being accidentally recorded over, use a screwdriver or similar object to carefully break off the erase-protection tabs.
If you later decide to record on the tape, you can place a piece of strong tape over the slots.
Erasing a Cassette Tape
If you no longer want a recording, you can record over it or erase it.
To record over a cassette tape, record as usual. The tape recorder records over the previous recording.
You can quickly erase both sides of a cassette tape using a bulk eraser, available at your local Radio Shack store.
Loosening Tape Tension
If you play a cassette tape several times, the tape can become tightly wound on either hub. This can cause distortion. To restore the correct tension, fast-forward through the entire cassette and then completely rewind it.
USING EARPHONES
Warning: To protect your hearing, set VOLUME to LOW before you put on the earphones. After you put on the earphones, adjust the volume to a comfortable listening level.
To listen in privacy, plug the earphones (not supplied) into the
PHONES jack. Be sure you select earphones with a 1/8-inch plug. Your local Radio Shack store sells a wide variety of earphones.
LISTENING SAFELY
To protect your hearing, follow these guidelines when you use earphones.
Do not listen at extremely high volume levels. Extended high-volume listening can lead to permanent hearing loss.
Set the volume to its lowest level before you begin listening. After you put on the earphones, adjust the volume to a comfortable listening level.
Do not increase the volume once you have established a comfortable listening level. Over time, your ears adapt to the volume level, so a volume level that does not cause discomfort could still damage your hearing.
TRAFFIC SAFETY
Do not wear earphones while operating a motor vehicle or riding a bicycle. This can cause a traffic hazard and is illegal in some areas.
Even though some earphones are designed to let you hear outside sounds when listening at normal volume levels, they still present a traffic hazard.
Chronosette-276 (120-1584) Care and Maintenance Faxback Doc. # 3771
The Chronosette-276 AM/FM Stereo Clock Radio with Cassette Recorder is an example of superior design and craftsmanship. The following suggestions will help you care for the Chronosette-276 so you can enjoy it for years.
Keep the Chronosette-276 dry. If it does get wet, wipe it dry immediately. Liquids might contain minerals that can corrode the electronic circuits.
Use and store the Chronosette-276 only in normal temperature environments. Temperature extremes can shorten the life of electronic devices, damage batteries, and distort or melt plastic parts.
Handle the Chronosette-276 gently and carefully. Dropping it can damage circuit boards and cases and can cause the Chronosette-276 to work improperly.
Keep the Chronosette-276 away from excessive dust and dirt, which can cause premature wear of parts.
Wipe the Chronosette-276 with a damp cloth occasionally to keep it looking new. Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the Chronosette-276.
Use only fresh batteries of the recommended size and type. Always remove old or weak batteries. They can leak chemicals that destroy electronic circuits.
Modifying or tampering with the Chronosette-276's internal components can cause a malfunction and might invalidate the Chronosette-276's warranty and void the FCC authorization to operate it. If your Chronosette-276 is not performing as it should, take it to your local Radio Shack store for assistance.
Chronosette-276 (120-1584) Specifications Faxback Doc. # 3772
RADIO
Frequency Range.............................................FM: 88-108 MHz
AM: 530-1710 MHz
CASSETTE PLAYER
Tape Speed.......................................................1 7/8 ips
Erasing System..............................................Magnetic Erase
Recording System...................................................AC Bias
GENERAL
Power Output.........................................................700mW
Speaker..................................................3 1/2 Inch, 8 Ohm
Permanent Dynamic Type
Dimensions...........................13 5/8 x 4 1/3 x 5 11/16 Inches (HWD)
Weight...............................................................4 lbs
Power Requirements.................................AC: 120 volts 60Hz, 10W
220/240 volts 50 Hz for European/Australian Models
Room temperature...............................77 degrees F (25 degrees C)
AM BAND
Speaker impedance:..................................................8 ohms
Output readings are taken across a non-reactive load.
Output reference level is 50mW total power.
The generator output shall terminate in an IRE loop with the loop pointing toward rear of receiver.
Modulation:...................................................1000 Hz, 30%
UNIT NOMINAL LIMIT
Frequency Coverage kHz 510-1750 520-172 IF kHz 455 +/-3
Antenna Sensitivity for S/N 20 dB at 600 kHz microV/M 500 900 at 1000 kHz microV/M 500 900
at 1400 kHz microV/M 500 900
ACA at reference level at 1000 kHz dB 20 18 AGC figure of merit dB 42 36 IF rejection at 600 kHz dB 34 28 Image rejection at 1400 kHz dB 40 35 Band-width at 6 dB down kHz 6 4-10 Output, at 10% THD at 1000 kHz 5 mV/m, 1000 Hz, 30% Modulation mW 600 500
Distortion at reference output
at 1000 Hz, 30% Modulation at 5 mV/m % 2 5
Whistle modulation of 2nd or 3rd harmonic at 1-100mVm % 3 15
Dial Calibration
at 540 kHz kHz - +/-20 at 1000 kHz kHz - +/-50 at 1600 kHz kHz - +/-80
FM BAND
Speaker impedance:..................................................8 ohms
Use resistive load
Reference output level:..............................................50 mW
Signal generator impedance:.......................................300 ohms
Disconnect antenna cable
The signal voltage in this specification or test data is the voltage appearing across the tuner input terminals.
Modulation:....................................1000 Hz, 22.5 kHz deviation
1000 Hz 75 kHz (L+R: 92%, Pilot: 8%) Deviation for FM/Stereo
UNIT NOMINAL LIMIT
Frequency Coverage MHz *87-109 88-108 IF MHz 10.7 +/-0.3 IHF Usable Sensitivity at 90 MHz microV 8 16 at 98 MHz microV 8 16 at 106 MHz microV 8 16
Sensitivity for 50 dB S/N at 90 MHz microV 10 20 at 98 MHz microV 10 20 at 106 MHz microV 10 20 S/N Ratio at 1 mV input dB 55 45
FM Limiting, 3 dB, at 98 MHz microV 20 50 IF rejection at 98 MHz dB 60 50 Image rejection at 106 MHz dB 26 20
ACA 100 microV +/-400 kHz 75 KHz deviation dB 20 15
Audio THD, 1000 Hz, 75 kHz deviation (1mV) % 2 4
Dial Calibration at 88 MHz kHz - +/-1000 at 100 MHz kHz - +/-1000 at 108 MHz kHz - +/-1000
Output Power at 10% THD,1000 Hz, 98 MHz
75 kHz deviation mW 600 500
Maximum outpout power 1 mW, at 98 MHz, 1000 Hz,
75 kHz deviation mW 700 600
Capture ratio at 1 mV,
98 MHz deviation dB 5 10
Separation 98 MHz 1 mW 100 Hz dB 25 15
1 kHz dB 30 25 10 kHz dB 20 12
Indicator Sensitivity 98 MHz microV 8 30
Clock Section
Measurement Item Nominal Limit
Minimum Clock operating voltage on Battery Back-up 7.0V 7.5V
Minimum Alarm operating voltage on Battery Back-up 7.0V 7.5V
Tape Section
Measurement Item Input/Test Tape Nominal Limit
Output Power at 1 kHz/channel
10% Distortion 8 ohm MTT-112BN 0.5W 0.45W Maximum 8 ohm MTT-112BN 0.65W 0.6W Signal to Noise 1000Hz MTT-112BN 47 dB 43 dB Distortion 1000Hz MTT-118BN 3% 5% Erase Ratio 1000Hz BLANK TAPE 50 dB 45 dB Channel Separation 1000Hz MTT-141N 36 dB 32 dB Hum and Noise Volume Minimum 2.5mV 5mV Wow & Flutter 3000Hz MTT-111N 0.2% 0.40%
Note: Nominal specs represent the design specs. All units should be able to approximate these- some will exceed and some might drop slightly below these specs. Limit specs represent the absolute worst condition that still might be considered acceptable: in no case should a unit fail to meet limit specs.
*European models must not be able to tune below 87.5 MHz.
(br/all-12/27/94) LN-03/04
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