To Next PageTo Next PageWhat to do if the alarm on my Tecsun Receiver only makes noise?
If your Tecsun Receiver's alarm only produces noise with the broadcast, it could be due to a few reasons. You may not have set the proper radio station for the alarm, so preset your alarm station properly. Alternatively, there might not be a broadcast at that radio station, so ensure there is a radio broadcast in your location.
What to do if during ATS, some stations cannot be stored or some stored stations have noise on my Tecsun Receiver?
If, during ATS, some stations cannot be stored or some stored stations have noise on your Tecsun Receiver, this can be caused by weak frequency signals. Try searching for the station manually. Another cause can be the interference near your location. Try lowering the antenna or moving to another location and try again.
What to do if the charging time becomes shorter and shorter for Tecsun PL-660?
If the charging time for your Tecsun Receiver is becoming shorter, it means the rechargeable batteries are getting old. Replace the old rechargeable batteries with new ones.
What to do if only limited FM stations can be received on Tecsun PL-660 Receiver?
If you can only receive limited FM stations on your Tecsun Receiver, the FM frequency range might be accidentally set to 76~90MHz. To correct this, turn off the radio, then press and hold the [FM SET] button to select the accurate FM frequency range.
What to do if Tecsun PL-660 malfunctions?
If your Tecsun Receiver is malfunctioning, it could be due to interference causing the computer microchip to not function properly. Try removing all the batteries and reloading them. If it still doesn't work, press the reset button with a pointed object.
Why is AM reception poor on my Tecsun PL-660 Receiver in the USA?
Poor AM reception in the USA on your Tecsun Receiver is likely because the USA uses a 10kHz AM tuning step, not 9kHz. To fix this, turn off the radio and press the [9/10kHz] button to select the accurate tuning step.
Why does my Tecsun PL-660 turn off while I'm listening?
Your Tecsun Receiver might be turning off for one of two reasons: the batteries may be running out of power, in which case you should replace them. Alternatively, the sleep timer may be activated; try turning the radio on again.
Steps to manually select radio frequencies using the tuning knob.
Method to automatically scan and briefly listen to stations.
Enter desired station frequencies directly using the keypad.
Guides on how to manually save favorite radio stations to memory.
Instructions for saving stations found during auto-scan modes.
Automatically scans and stores available stations within memory banks.
Method to navigate and select different memory pages for stored stations.
Procedure to remove a single stored station from memory.
Delete stations while auto-browsing through memory entries.
Procedure to erase all stored stations on a specific memory page.
How to manually tune through saved stations in memory.
Automatically scan and play stored stations sequentially.
Access stored stations by directly entering their memory address.
How to choose a radio station to wake up to.
Procedure to set the alarm activation time and duration.
Configures the usable FM broadcast frequency range for local areas.
Enables or disables the Long Wave (LW) reception band.
Selects the tuning step increment for the Medium Wave (AM) band.
Controls whether the LCD backlight activates automatically.
Manages the radio's ability to charge rechargeable batteries.
Solutions for when the radio fails to power on.
Troubleshooting steps for unexpected radio shutdowns.
Resolving problems with storing stations during ATS.
Solutions for receiving only a few FM stations.
Specific advice for improving AM reception in the USA.
Troubleshooting tips for weak audio on SW SSB bands.
Diagnosing and fixing noise issues when the alarm is active.
Addressing the problem of the charging time becoming shorter.
General solutions for radio operational issues and malfunctions.
The Tecsun PL-660 is a PLL synthesized receiver designed for comprehensive radio reception across multiple bands, including FM Stereo, MW, LW, SW-SSB, and Air Band. This versatile device offers a range of features for both casual listening and serious shortwave enthusiasts, emphasizing sensitivity, selectivity, and user-friendly operation.
The PL-660 serves as a portable world receiver, capable of tuning into a wide spectrum of radio frequencies. Its primary function is to receive broadcast signals from various bands, providing audio output through its built-in speaker or an earphone jack. The PLL (Phase-Locked Loop) synthesis ensures stable and accurate tuning, which is crucial for clear reception, especially on shortwave and SSB frequencies.
For FM reception, the radio supports FM Stereo, enhancing the listening experience when using earphones. The MW (Medium Wave) and LW (Long Wave) bands cater to regional and international broadcasts, while the SW (Shortwave) band is designed for long-distance reception, often used by hobbyists and for international news. A key feature for shortwave listeners is the Single Side Band (SSB) capability, which includes both Upper Side Band (USB) and Lower Side Band (LSB) detection. This allows for the reception of amateur radio, utility, and other specialized SSB transmissions. Additionally, the PL-660 includes an Air Band, enabling users to listen to aircraft communications.
The radio incorporates a synchronous detector, which is particularly useful for improving AM reception. This function helps to reduce interference from adjacent strong signals and mitigate fading, leading to a clearer and more stable audio output. The dual conversion technology applied to AM bands (SW/MW/LW) further enhances the receiver's performance in terms of sensitivity, selectivity, and resistance to inter-modulation and channel interference.
Memory storage is a significant aspect of the PL-660, offering a total of 2000 memory presets. These are organized into a main Page 0 with 800 memories (100 each for FM/MW/LW/Air Band, and 200 each for SW/SSB) and 12 additional pages (P1-P12), each containing 100 memories, totaling 1200. This extensive memory capacity allows users to store a vast number of favorite stations for quick access.
The device also includes practical features like a sleep timer, which automatically turns off the radio after a user-defined period (1 to 120 minutes), and an alarm function with two independent timers (Timer A and Timer B). The alarm can be set to turn on the radio to a preset station and volume, providing a convenient wake-up or reminder function.
Operating the PL-660 is designed to be intuitive, with multiple tuning methods to suit different preferences.
Managing stored stations is also flexible:
The PL-660 offers several controls to optimize reception and audio quality:
For improving FM and SW reception, an external wire antenna can be connected to the dedicated jack, allowing for better signal capture, especially when hung outside a window.
The PL-660 is designed with battery management and system stability in mind.
Overall, the Tecsun PL-660 is a robust and feature-rich portable radio, offering extensive band coverage, advanced reception technologies, and user-friendly controls, making it suitable for a wide range of radio listening activities.
Frequency Range| FM frequency range | 76~108 / 87~108 MHz |
|---|---|
| MW frequency range | 522~1620 / 520~1710 kHz |
| LW frequency range | 100~519 kHz |
| SW frequency range | 1711~29999 kHz |
| AIR frequency range | 118~137 MHz |
Sensitivity| FM sensitivity | Less than 3 uV |
|---|---|
| MW sensitivity | Less than 1 mV/m |
| LW sensitivity | Less than 5 mV/m |
| SW sensitivity | Less than 20 uV |
| SSB sensitivity | Less than 1 uV |
| AIR sensitivity | Less than 5 uV |
Selectivity and S/N Ratio| FM selectivity | ＞ 30 dB (±200 kHz) |
|---|---|
| MW/LW selectivity | ＞ 40 dB (±9 kHz) |
| SW selectivity | ＞ 40 dB (±5 kHz) |
| FM S/N ratio | Less than 60 dB |
| MW/LW S/N ratio | Less than 45 dB |
| SW S/N ratio | Less than 50 dB |
AM Frequency| SSB, AM 1st IF | 55.845 MHz |
|---|---|
| AM 2nd IF | 455 kHz |
| FM IF | 10.7 MHz |
Output Power| Speaker output power | ≥ 450 mW |
|---|---|
| Earphone output power | ≥ 10 mW |
| FM Stereo crosstalk | Less than 20 dB |
