Potentiometre w rotary switch

ESSAYÉ EN FM ET LW OK POUR LES AUTRES BANDES PAS D’ANTENNES APPROPRIÉES Année: 1976-1978? Catégorie: Récepteur de diffusion - ou passé tuner WW2 Semi-conducteurs (le compte est seulement pour des transistors) 34: Superhétérodyne, conversion double / triple; IF / IF 2000/455 kHz bandes onde Diffusion, grande longueur d'onde, morethan 2 x SW, plus FM ou UHF. détails Type de puissance et de tension Ligne / piles (tout type) / 110/220 Volt Haut-parleur aimant permanent (Dynamic Pdyn) Haut-parleur (à bobine mobile) / 4 de pouce de diamètre = 10,2 cm out Power 2 W (qualité inconnue) de Radiomuseum.org Modèle: RF-4800 LBS / DR-48 - Panasonic, Matsushita, matière divers matériaux forme Modèle de table, profil bas (grande taille). Dimensions (LHP) 480 x 200 x 355 mm / 18,9 x 7,9 x 14 pouces notes Couverture LW, BC (MW), SW 1600-30000 kHz, VHF (FM). Dessous de 3000 kHz seule conversion, au-dessus de 3000 kHz à double conversion. Compteur numérique uniquement pour les bandes 2 ondes courtes - 8. Vendu aux États - Unis en tant que RF-4800 celui ci contrairement au DR 48 ne couvre pas le pas LW). Poids net (2,2 lb = 1 kg) 8 kg / 17 lb 9,9 oz (17.621 lb) The Panasonic RF-4800 LBS has been sold in Europe as DR-48, it covers also the longwave band. The DR-48 is a quite bulky desktop receiver with it's dimensions of 48 x 20, x 35,5 cm and it's weight of 8 kg; two metal handles give protection to the front panel, when the set is turned face down - the give the set the aspect of a semiprofessional receiver. The RF-4800 can be powered from 110 / 220 V mains, from a 12 V car battery or eight UM-1 / mono cells accomodated in two battery compartments. At the left side of the frontpanel, You find the big speaker and below the mains switch, the jacks for an external speaker and a cassette recorder at further right the rotary controls for volume, bass, treble and the BFO pitch control. In the middle of the display window at the right, You find the red LED display of the frequency counter active on shortwave bands SW 2 - 7 and the auxiliary dials for long-, mediumwaves, tropical bands (SW 1) and the FM broadcast band at the left and the shortwave bands SW 2 - 7, each 4 MHz wide, at the right. In the middle of the frontpanel the huge main tuning knob is located, it is equipped with a crank and can be set to slow and fast tuning speed by pressing the knob in the centre - this knob will tune the shortwave bands. The frequency display is active on these band segments and the receiver operates as a double conversion receiver. The second smaller tuning knob tunes the long-, mediumwave, SW1 and FM broadcast bands, in these bands, the set operates as single conversion set and the frequency display is not active. The signal strength meter tends to read high, in the RF-4800 it has a white background, this is a possibility to distinguish the set from the RF-4900, the S meter of the successor comes with a black background. Below You find a row of switches: the switch to activate the AFC in FM mode selects between the two AM bandwidths in AM mode, the middle switch activates the noise limiter and the third one the BFO: use the BFO pitch control just below for an optimum BFO note when receiving CW transmissions and for optimum speech reproduction in SSB mode - voices should no sound like mickey mouse. The bandswitch for LW - MW - SW1 - FM and the band segment switch for SW 2 - 7 are located below the right auxilitary frequency dial. The frequency counter can be calibrated from a 5 or 10 MHz time signal and frequency standard transmission from WWV / WWVH or even from another station transmitting exactly on a known frequency. Tune in to "Radio Deutsche" Welle on 6075 kHz and wait for news and station identification, then tune to maximum S meter reading and use the SW 2-7 CAL control to set the frequency display exactly to display 6.075 - with this control not set correctly, the frequency displayed can be 2 - 4 kHz off the actual frequency. Keep in mind, the RF-4800 is no PLL synthesized set. In the right lower part of the front panel, You find the ANT TRIM to match an external antenna, the R.F. gain control. This should be set to maximum position or "DX" as a standard, in case of overloading of the receiver front end due to high signal level conditions in acrowded shortwave broadcast band wit ha long antenna, You can reduce the R.F. gain. In fact, this knob acts more like an attenuator as there is no switch to turn off the AGC (automated gain control) completely. Three more switches activate dial illumination, frequency display and set the S meter to indicate battery power. At the rear face of the DR-48 / RF-4800 LBS, You find the two folding out ferrite antennas for long- and mediumwaves, the international variant comes with only one ferrite antenna. Next to the antenna sockets, there is a PL / SO 239 antenna socket for SW 2 - 7. The DIN socket can be used to feed the DR-48's audio signal to a cassette recorder and also to feed a signal from an external audio source to the receiver, set the switch at the rear to "PHONO" to use the DR-48 as audio amplifier. The operation scheme of the DR-48 is quite straightforward: turn on the set, make sure the RF gain control is turned to the MAX setting, the AM bandwidth to wide and the BFO turned off. The right bandselector should be on SW 2 - 7 and the left on "2" to select the 3 - 7 MHz range, the use the big tuning knob to find the "Deutsche Welle" from Cologne on 6.075 MHz. If the signal peak is one or two kHz higher or lower then 6.075, use the SW 2-7 CAL to adjust the frequency display setting to the correct frequency. Due to it's conventional design as a double conversion receiver with a quite low first I.F. and a frequency counter, the receiver shows a certain frequency drift even after warm up, CW or radioteletype decoding with an automatic decoder and even reception of SSB signals need slight retuning of the set from time to time, automated recordings won't work properly. The skirt selectivity of the two I.F. filter's is mediocre. quite often, You hear an 5 kHz interference whistle from a adjacent channel carrier. As the receiver operates as single conversion set below 3 MHz, You might encounter mirroring or "ghost signals" appearing 900 kHz from the original signal away. As the internal ferrite antennas cannot be switched of, the DR-48 / RF-4800 is not well suited as a longwave / mediumwave DX receiver. Conclusion: the DR-48 / RF-4800 represents the state of the art from the early eighties as desktop receiver with double conversion circuitry connected to a frequency counter, stability, suppression on unwanted signals and selectivity of the I.F. filters is all below the expectations for a shortwave receiver in the 21st century. The DR-48 / RF-4800 looks very impressive and makes a decent secondary or entry level shortwave radio, for real Dxing, You would need a set with better filters, maybe a notch filter and passband tuning and a few memories to compare different frequencies. If You find a DR-48 / RF-4800 for a bargain price, get one, and You might have lot of fun with it. The technical built quality is not superior, so You might encounter some work until the receiver is running properly. In my sets, the wave band and shortwave band switches all did contact poorly and needed cleaning, as well as the AM narrow / wide switch and even the rotary volume and tone controls.

1. Introduction   This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.   2.   Parameter   NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume, 60mA at minimum volume (for reference only) 7 Sound track Stereo       3. Using attention:   1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module. 2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.   4. Feature   1>. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation. 2>. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference. 3>. 30 digital volume adjustment, with buttons, easy to operate. 4>. Automatically storage data before power off. 5>. Automatic switch of speaker/headphone output. 6>. Quartz crystal steady frequency, temperature change reception frequency, no longer drift. 7>. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal. 8>. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle. 9> Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.   5. Instruction   1>. Power supply Module corresponding port (marked on PCB board). “-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current. 2>. Antenna The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm. 3>. Headset/speaker output This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically. 4>. Volume Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series. 5>. Frequency regulation Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch. 6>. Mute Press the VOL knob to switch the mute/non-mute button down. 7>. AMCAP switch Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP. 8>. AMCAP threshold adjustment(when the AMCAP switch on) Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa. 9>. Serial port (without serial port control) The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module's UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals. 10>. User Settings This module can set the backlight state according to the user's specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds. 11>. Stereo /mono switch terminal. Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.   6. FM with squelch receiver module AT instruction: Baud rate: 38400 TTL level   No. Name Example Instruction Range Return position 1 Set current frequency point AT+FRE=875 current frequency point is 87.5MHz  870-1080 MHz Current frequency point/ERR 2 Frequency point-0.1MHZ AT+FRED     Current frequency point   Le 10-juil.-19 à 05:53:17 Paris, le vendeur a ajouté les informations suivantes:

1. Introduction   This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.   2.   Parameter   NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume, 60mA at minimum volume (for reference only) 7 Sound track Stereo       3. Using attention:   1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module. 2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.   4. Feature   1>. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation. 2>. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference. 3>. 30 digital volume adjustment, with buttons, easy to operate. 4>. Automatically storage data before power off. 5>. Automatic switch of speaker/headphone output. 6>. Quartz crystal steady frequency, temperature change reception frequency, no longer drift. 7>. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal. 8>. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle. 9> Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.   5. Instruction   1>. Power supply Module corresponding port (marked on PCB board). “-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current. 2>. Antenna The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm. 3>. Headset/speaker output This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically. 4>. Volume Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series. 5>. Frequency regulation Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch. 6>. Mute Press the VOL knob to switch the mute/non-mute button down. 7>. AMCAP switch Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP. 8>. AMCAP threshold adjustment(when the AMCAP switch on) Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa. 9>. Serial port (without serial port control) The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module's UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals. 10>. User Settings This module can set the backlight state according to the user's specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds. 11>. Stereo /mono switch terminal. Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.   6. FM with squelch receiver module AT instruction: Baud rate: 38400 TTL level   No. Name Example Instruction Range Return position 1 Set current frequency point AT+FRE=875 current frequency point is 87.5MHz  870-1080 MHz Current frequency point/ERR 2 Frequency point-0.1MHZ AT+FRED     Current frequency point   Le 09-juil.-19 à 17:37:11 Paris, le vendeur a ajouté les informations suivantes:

1. Introduction   This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.   2.   Parameter   NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume, 60mA at minimum volume (for reference only) 7 Sound track Stereo       3. Using attention:   1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module. 2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.   4. Feature   1>. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation. 2>. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference. 3>. 30 digital volume adjustment, with buttons, easy to operate. 4>. Automatically storage data before power off. 5>. Automatic switch of speaker/headphone output. 6>. Quartz crystal steady frequency, temperature change reception frequency, no longer drift. 7>. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal. 8>. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle. 9> Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.   5. Instruction   1>. Power supply Module corresponding port (marked on PCB board). “-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current. 2>. Antenna The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm. 3>. Headset/speaker output This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically. 4>. Volume Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series. 5>. Frequency regulation Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch. 6>. Mute Press the VOL knob to switch the mute/non-mute button down. 7>. AMCAP switch Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP. 8>. AMCAP threshold adjustment(when the AMCAP switch on) Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa. 9>. Serial port (without serial port control) The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module's UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals. 10>. User Settings This module can set the backlight state according to the user's specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds. 11>. Stereo /mono switch terminal. Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.   6. FM with squelch receiver module AT instruction: Baud rate: 38400 TTL level   No. Name Example Instruction Range Return position 1 Set current frequency point AT+FRE=875 current frequency point is 87.5MHz  870-1080 MHz Current frequency point/ERR 2 Frequency point-0.1MHZ AT+FRED     Current frequency point   Le 08-juil.-19 à 15:14:31 Paris, le vendeur a ajouté les informations suivantes:

1. Introduction   This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.   2.   Parameter   NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume, 60mA at minimum volume (for reference only) 7 Sound track Stereo       3. Using attention:   1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module. 2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.   4. Feature   1>. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation. 2>. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference. 3>. 30 digital volume adjustment, with buttons, easy to operate. 4>. Automatically storage data before power off. 5>. Automatic switch of speaker/headphone output. 6>. Quartz crystal steady frequency, temperature change reception frequency, no longer drift. 7>. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal. 8>. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle. 9> Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.   5. Instruction   1>. Power supply Module corresponding port (marked on PCB board). “-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current. 2>. Antenna The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm. 3>. Headset/speaker output This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically. 4>. Volume Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series. 5>. Frequency regulation Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch. 6>. Mute Press the VOL knob to switch the mute/non-mute button down. 7>. AMCAP switch Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP. 8>. AMCAP threshold adjustment(when the AMCAP switch on) Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa. 9>. Serial port (without serial port control) The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module's UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals. 10>. User Settings This module can set the backlight state according to the user's specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds. 11>. Stereo /mono switch terminal. Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.   6. FM with squelch receiver module AT instruction: Baud rate: 38400 TTL level   No. Name Example Instruction Range Return position 1 Set current frequency point AT+FRE=875 current frequency point is 87.5MHz  870-1080 MHz Current frequency point/ERR 2 Frequency point-0.1MHZ AT+FRED     Current frequency point   Le 10-août-19 à 10:14:47 Paris, le vendeur a ajouté les informations suivantes:

1. Introduction   This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.   2.   Parameter   NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume, 60mA at minimum volume (for reference only) 7 Sound track Stereo       3. Using attention:   1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module. 2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.   4. Feature   1>. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation. 2>. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference. 3>. 30 digital volume adjustment, with buttons, easy to operate. 4>. Automatically storage data before power off. 5>. Automatic switch of speaker/headphone output. 6>. Quartz crystal steady frequency, temperature change reception frequency, no longer drift. 7>. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal. 8>. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle. 9> Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.   5. Instruction   1>. Power supply Module corresponding port (marked on PCB board). “-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current. 2>. Antenna The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm. 3>. Headset/speaker output This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically. 4>. Volume Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series. 5>. Frequency regulation Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch. 6>. Mute Press the VOL knob to switch the mute/non-mute button down. 7>. AMCAP switch Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP. 8>. AMCAP threshold adjustment(when the AMCAP switch on) Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa. 9>. Serial port (without serial port control) The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module's UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals. 10>. User Settings This module can set the backlight state according to the user's specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds. 11>. Stereo /mono switch terminal. Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.   6. FM with squelch receiver module AT instruction: Baud rate: 38400 TTL level   No. Name Example Instruction Range Return position 1 Set current frequency point AT+FRE=875 current frequency point is 87.5MHz  870-1080 MHz Current frequency point/ERR 2 Frequency point-0.1MHZ AT+FRED     Current frequency point Le 30-août-19 à 13:44:50 Paris, le vendeur a ajouté les informations suivantes:

1. Introduction   This FM stereo digital radio circuit board module has built-in DSP digital noise processing. When there is no signal, it will automatically mute and get rid of the noise of the traditional FM radio.   2.   Parameter   NO. Parameter Value 1 Output power 500mW (drive earphone), 3Wx2 (drive horn) 2 Frequency range 50Hz-18KHz  3 Receiving frequency range 87.0MHz-108.0MHz 4 Equivalent noise Greater than 30dB 5 Power supply voltage 3.0V-5.0V 6 Power supply current 1000mA at maximum volume, 60mA at minimum volume (for reference only) 7 Sound track Stereo       3. Using attention:   1>. The power supply voltage is strictly prohibited to exceed the power supply voltage range of this module. 2>. Do not touch the back part of the module when working, so as not to affect the normal work of this module or cause the short-circuit burn module.   4. Feature   1>. Advanced digital audio signal processing technology (DSP) and FM phase-locked loop modulation (PLL) make the sound quality more realistic, more stable performance, and long working frequency without deviation. 2>. LCD display is more intuitive and accurate, with extremely low power consumption and minimal noise interference. 3>. 30 digital volume adjustment, with buttons, easy to operate. 4>. Automatically storage data before power off. 5>. Automatic switch of speaker/headphone output. 6>. Quartz crystal steady frequency, temperature change reception frequency, no longer drift. 7>. It uses professional audio DSP to analyze and process the audio signal, and automatically mute when there is no signal or weak signal. 8>. It uses incremental digital rotary encoder to adjust the volume and frequency, using the feel is good, positioning accuracy, stable and durable, 360 ° rotating without blind Angle. 9> Support serial communication control, available computer or MCU and other devices with serial ports to control all functions of the module.   5. Instruction   1>. Power supply Module corresponding port (marked on PCB board). “-” and “+” are the anode and cathode of the power (battery). The power supply is recommended for battery or other stabilized power supply.You cannot use a power supply without filter (such as mobile phone charger, mobile power supply, and other switching power supply), otherwise the interference caused by power supply will affect the normal work of this module. The normal working voltage of this module is 3.0-5.0V, not exceeding this range. At the maximum volume of the module, the maximum power supply current is around 1A, which requires the battery to output enough current. 2>. Antenna The FM_ANT port is used to connect the FM antenna. To better receive the FM signal, it is recommended to extend the antenna with a length of 75cm. 3>. Headset/speaker output This module is with 3WX2 channel audio amplifier. If the horn is needed, access the speaker port. It is recommended to use 4 Ω / 3 w speakers.If the headset is inserted, the audio will automatically switch to the headphone channel, and the speaker channel will be closed automatically. 4>. Volume Turn the VOL encoder to adjust the volume, while the LCD screen displays the volume series. 5>. Frequency regulation Turn the FRE encoder to adjust the reception frequency, while the LCD screen displays the current frequency, and press the encoder handle to the mute/non-mute switch. 6>. Mute Press the VOL knob to switch the mute/non-mute button down. 7>. AMCAP switch Long press the FRE knob to switch on or off the AMCAP, the LCD display subtitle ON means to turn on the AMCAP, and OFF means to turn off the AMCAP. 8>. AMCAP threshold adjustment(when the AMCAP switch on) Short press the FRE knob to AMCAP threshold adjustment interface, you can adjust the movement threshold of the AMCAP according to the specific usage situation. The adjustment range is 0-20. The higher the value is, the higher the threshold is, the easier the weak signal is to be silent. Vice versa. 9>. Serial port (without serial port control) The module reserved TTL level serial port control interface. TTL serial port and this module communication need to connect the module's UART_RX, UART_TX and GND (the corresponding position of PCB is marked). You can use the external MCU or the computer serial port to send the command control module related functions. Note: because the computer serial port is not TTL level, connect the computer communication, it is necessary to connect the RS323 level to TTL power leveling device or the USB TTL level serial port module to communicate with this module. This operation requires professionals. 10>. User Settings This module can set the backlight state according to the user's specific usage. When the power is off, press the FRE button to turn on, and the B0 indicates that the backlight is always bright. B0 indicates that the backlight is closed for 20 seconds, and the setting is effective after the restart. Change the Settings state to repeat this step to switch. The backlight has no operation for 20 seconds. 11>. Stereo /mono switch terminal. Stereo/mono terminals are used to set the FM receiving mode of the module. This terminal is suspended for Stereo reception mode, and it is a single channel receiving mode.   6. FM with squelch receiver module AT instruction: Baud rate: 38400 TTL level   No. Name Example Instruction Range Return position 1 Set current frequency point AT+FRE=875 current frequency point is 87.5MHz  870-1080 MHz Current frequency point/ERR 2 Frequency point-0.1MHZ AT+FRED     Current frequency point   Le 30-août-19 à 11:05:14 Paris, le vendeur a ajouté les informations suivantes: