Query: rv3yf

title: Simple QRP CW Transceiver. Soldering Project Kit.
text: Product Description Soldering Project Kit This direct frequency conversion micro-transceiver is designed for QRPP Telegraph operation on an Amateur 80 or 40 or 20 meters (depends of the quartz crystal). You may choose the crystal. Available crystals: 3.570, 7.020, 7.023, 7.030, 7.050, 14.058, 14.31818 MHz. Please, inform us before shipping what crystal do you need. By default, 3,570 MHZ. The output power of the transceiver is 500 mW. Kit is easy to build: takes ~40-60 minutes. The Transceiver starts working without any long-term adjustments (just need to make fine tuning of frequency of the crystal). Recommended to novice in Radio. Manual in English is included. Product Description Soldering Project Kit This direct frequency conversion micro-transceiver is designed for QRPP Telegraph operation on an Amateur 80 or 40 or 20 meters (depends of the quartz crystal). You may choose the crystal. Available crystals: 3.570, 7.020, 7.023, 7.030, 7.050, 14.058, 14.31818 MHz. Please, inform us before shipping what crystal do you need. By default, 3,570 MHZ. The output power of the transceiver is 500 mW. Kit is easy to build: takes ~40-60 minutes. The Transceiver starts working without any long-term adjustments (just need to make fine tuning of frequency of the crystal). Recommended to novice in Radio. Manual in English is included.

title: CW/Notch Filter for HF transceiver. Soldering Project Kit
text: Product Description Soldering Project Kit The filter allows to select telegraphic and other narrow-band signals and suppress tone interference and adjacent frequency CW station. The filter is included in the audio path of the transceiver or receiver operating in SSB or CW. The operating frequency range 350-3200 Hz. The level of rejection 40 dB. The Ewha woman. 100-500 mV. Transfer ratio 1. The 12V supply. Product Description Soldering Project Kit The filter allows to select telegraphic and other narrow-band signals and suppress tone interference and adjacent frequency CW station. The filter is included in the audio path of the transceiver or receiver operating in SSB or CW. The operating frequency range 350-3200 Hz. The level of rejection 40 dB. The Ewha woman. 100-500 mV. Transfer ratio 1. The 12V supply.

title: Universal Lowpass Filters for HF Amateur Transceiver (LPF). 9 Bands. Soldering Project KiT.
text: Product Description Universal Lowpass filters for HF Amateur Transceiver (LPF) This Lowpass filters for harmonic filtering at the output of the amplifier can be used with amateur transceivers There are six two-element low pass filters (LPF) in this design. The switching of bands regulates by Relays. Relay P1 (12V) at output of lowpass filters connects to the Power Amplifier or Bandpass filters of transceiver. It identify the RX/TX modes. The bands 7MHz and 10 MHz, 18 MHz and 21, 24 and 28 MHz unified and have a common low pass filters, switching relays of these bands is carried through the decoder diodes. PCB dimensions 90х62 mm. Product Description Universal Lowpass filters for HF Amateur Transceiver (LPF) This Lowpass filters for harmonic filtering at the output of the amplifier can be used with amateur transceivers There are six two-element low pass filters (LPF) in this design. The switching of bands regulates by Relays. Relay P1 (12V) at output of lowpass filters connects to the Power Amplifier or Bandpass filters of transceiver. It identify the RX/TX modes. The bands 7MHz and 10 MHz, 18 MHz and 21, 24 and 28 MHz unified and have a common low pass filters, switching relays of these bands is carried through the decoder diodes. PCB dimensions 90х62 mm.

title: Bandpass Filters BPF-4. Soldering Project KIT
text: Product Description "BPF-4" is a bandpass filter for 4 bands (1.8, 3.5, 7 and 14 MHz). This unit can be used in most transceivers and receivers. If need other bands - it is easy to re-build - just need to change the winding and replace the capacitor. BPF is very small and easy for assembly. Dimensions of board are 55x58mm. For adjustment recommends to use NWT or RF voltmeter; or S-meter on air if have no such devices. The Kit consists of all necessary components, elements, wire and manual in English. Product Description "BPF-4" is a bandpass filter for 4 bands (1.8, 3.5, 7 and 14 MHz). This unit can be used in most transceivers and receivers. If need other bands - it is easy to re-build - just need to change the winding and replace the capacitor. BPF is very small and easy for assembly. Dimensions of board are 55x58mm. For adjustment recommends to use NWT or RF voltmeter; or S-meter on air if have no such devices. The Kit consists of all necessary components, elements, wire and manual in English.

title: QRP SSB Transceiver AMATOR. Soldering Project KiT.
text: Product Description Soldering Project KiT Transceiver parameters Range of operating frequencies: 160m, 80m, 40m and 20m Operation: SSB Sensitivity in case of the relation signal/noise of 12 dB: 1 µV; Selectivity on adjacent and to other collateral channels of reception - 60 dB; The range of action of AGC system, is at least: 60 dB. The peak of power output on loading 50 Ohms, is at least: 5 W; Suppression of collateral channels in a transmission mode, not worse than: 40 dB; Consuming current, no more: 0,6 A. TRX "AMATOR" consists of 4 units: - Motherboard - Bandpass filter BPF-4 - Power Amplifier "AMATOR" - VFO synthesizer Each kit has all elements for building radio. Manual in English Product Description Soldering Project KiT Transceiver parameters Range of operating frequencies: 160m, 80m, 40m and 20m Operation: SSB Sensitivity in case of the relation signal/noise of 12 dB: 1 µV; Selectivity on adjacent and to other collateral channels of reception - 60 dB; The range of action of AGC system, is at least: 60 dB. The peak of power output on loading 50 Ohms, is at least: 5 W; Suppression of collateral channels in a transmission mode, not worse than: 40 dB; Consuming current, no more: 0,6 A. TRX "AMATOR" consists of 4 units: - Motherboard - Bandpass filter BPF-4 - Power Amplifier "AMATOR" - VFO synthesizer Each kit has all elements for building radio. Manual in English

title: Amateur Micro Transceiver IC-174. Soldering Project KiT
text: Product Description Soldering Project Kit The appearance of chips with a high degree of integration has greatly simplified the design of small-sized communications equipment. This design has modern available radio elements and could be adjusted to 1,8MHZ; 3,5MHZ and 7 MHz bands (160m, 80m, 40m). Distinctive features of the transceiver - small size and simplicity of production at high quality of work. This transceiver is operating only on 160 meters band. By changing the values of winding and some capacitors it is possible to get 40 and 80 meters. The main feature of this Transceiver - is two Electro-Mechanical filters (EMF): one for RX path, another for TX path. Technical Parameters: - The sensitivity of receiving path of the transceiver at a signal / noise ratio of 10 dB-not worse than 3 mV. - Output power - not less than 300 mW. - Input resistance -75 Ohms. - Output power of the transmitting path at a load of 75 Ohms resistance -not less than 200 mW. - Maximum current consumption from the voltage source 11..15 V when working on the transmission - 250 mA. - Maximum current consumption from the voltage source 11..15 V when working in RX - 100 mA. KIT consists of all elements for building the motherboard: High Quality PCB, transistors, diodes, Crystal 500 kHz, inductors + wire, capacitors and resistors, 500KHZ IF EMF filters - 2pcs. Product Description Soldering Project Kit The appearance of chips with a high degree of integration has greatly simplified the design of small-sized communications equipment. This design has modern available radio elements and could be adjusted to 1,8MHZ; 3,5MHZ and 7 MHz bands (160m, 80m, 40m). Distinctive features of the transceiver - small size and simplicity of production at high quality of work. This transceiver is operating only on 160 meters band. By changing the values of winding and some capacitors it is possible to get 40 and 80 meters. The main feature of this Transceiver - is two Electro-Mechanical filters (EMF): one for RX path, another for TX path. Technical Parameters: - The sensitivity of receiving path of the transceiver at a signal / noise ratio of 10 dB-not worse than 3 mV. - Output power - not less than 300 mW. - Input resistance -75 Ohms. - Output power of the transmitting path at a load of 75 Ohms resistance -not less than 200 mW. - Maximum current consumption from the voltage source 11..15 V when working on the transmission - 250 mA. - Maximum current consumption from the voltage source 11..15 V when working in RX - 100 mA. KIT consists of all elements for building the motherboard: High Quality PCB, transistors, diodes, Crystal 500 kHz, inductors + wire, capacitors and resistors, 500KHZ IF EMF filters - 2pcs.

title: Simple QRP CW Transceiver OK1XGL. Soldering Project KIT
text: Product Description Petr Fiser from Czech (OK1XGL) developed QRP transceiver of direct conversion as design intended for beginners in radio. However, this transceiver can be quite successfully used by those who interested in ham radio at low power, especially when working in the field. Working range depends of the crystal: 7.020, 7.023, 7.030, 7.050, 14.058, 14.31818 MHz The supply voltage of the transceiver is 9-12 V Current consumption is 45 mA in receive mode Current consumption is 100 mA in transmit mode The antenna input impedance is 50 Ohms The receiver sensitivity is 0.4 µV Output power is 130 mW. Transceiver starts working without any adjustments if all elements are on its places. Strongly recommended for Novice in Radio. KIT consists of all elements for the Project. Product Description Petr Fiser from Czech (OK1XGL) developed QRP transceiver of direct conversion as design intended for beginners in radio. However, this transceiver can be quite successfully used by those who interested in ham radio at low power, especially when working in the field. Working range depends of the crystal: 7.020, 7.023, 7.030, 7.050, 14.058, 14.31818 MHz The supply voltage of the transceiver is 9-12 V Current consumption is 45 mA in receive mode Current consumption is 100 mA in transmit mode The antenna input impedance is 50 Ohms The receiver sensitivity is 0.4 µV Output power is 130 mW. Transceiver starts working without any adjustments if all elements are on its places. Strongly recommended for Novice in Radio. KIT consists of all elements for the Project.

title: Simple Single Band Receiver Based on K174XA2 (TCA440)
text: Product Description Sodlering Project Kit This is simple direct direction receiver. It was specially developed for novice in radio. It has not difficult circuit and easy to understand the schematic. Working range: 160 meters or 80 meters or 40 meters - you choose the band during assembly. Core of the receiver: K174XA2 (TCA440) Operation: SSB Power supply: 9V Adjusting time if all elements completed correctly - 5 minutes. Note: RECOMENDED for Novice. The KIT consists of all components for assembly, manual in English. Product Description Sodlering Project Kit This is simple direct direction receiver. It was specially developed for novice in radio. It has not difficult circuit and easy to understand the schematic. Working range: 160 meters or 80 meters or 40 meters - you choose the band during assembly. Core of the receiver: K174XA2 (TCA440) Operation: SSB Power supply: 9V Adjusting time if all elements completed correctly - 5 minutes. Note: RECOMENDED for Novice. The KIT consists of all components for assembly, manual in English.

title: SSB Double-Band Receiver CW/SSB “Lidia” (40/80 Meters). Soldering Project. KIT DIY
text: Product Description This is Soldering project kit diy. Receiver "Lydia-band 2" is a simple direct conversion receiver designed novice in ham radio for listening to SSB/CW Amateur stations First and foremost, this project is intended for beginning hams, not having much experience in the design of the equipment. And for radio Amateurs who want a weekend to relax and do radio. The receiver operates in two frequency bands 80 meters (3.5-3.8 MHz or 3.8-4.0 MHz for US) and 40 meters (7.0 - 7.3 MHz). The main element is a MC3361, which is used in most FM receivers with double frequency conversion. In the receiver used: internal oscillator circuits, mixer and active filter. Bandpass filters at the receiver input, in spite of using axial inductors, provides the appropriate bandwidth, sensitivity, and harmonizing with the mixer. Input sensitivity of the receiver is adjusted by a simple antenna attenuator "Level treble" on the variable resistor integrated with a manual gain control. The VFO (Variable Frequency Oscillator) is running in the circuit with the chokes on 80 m and 40 m, varactors and variable resistor configuration. The stability of the VFO enough to listen to the stations. RX PCB dimensitons: 85 x 60 KIT consists of 1. KIT diy of RX board (all elements inside of the kit) 2. KIT diy of frequency meter + 7 segment 0.36" display 3. KIT diy of cabinet for receiver: - Black plastic case dimensions 150х110х78 mm - Black front and back panels. All holes are drilled. - All contrrol devices (LED, knobs for potentiometers, power switcher, sockers, plugs) - 8 Ohm Speaker - Wires for conenctions inside of cabinet - stands and screws for mounting the PCB and frequency meter Each KIT has manual in English! *RECOMMENDED FOR NOVICE IN HAM RADIO or those who want have rest for the weekend and enjoy from assembly of the simple receiver. Product Description This is Soldering project kit diy. Receiver "Lydia-band 2" is a simple direct conversion receiver designed novice in ham radio for listening to SSB/CW Amateur stations First and foremost, this project is intended for beginning hams, not having much experience in the design of the equipment. And for radio Amateurs who want a weekend to relax and do radio. The receiver operates in two frequency bands 80 meters (3.5-3.8 MHz or 3.8-4.0 MHz for US) and 40 meters (7.0 - 7.3 MHz). The main element is a MC3361, which is used in most FM receivers with double frequency conversion. In the receiver used: internal oscillator circuits, mixer and active filter. Bandpass filters at the receiver input, in spite of using axial inductors, provides the appropriate bandwidth, sensitivity, and harmonizing with the mixer. Input sensitivity of the receiver is adjusted by a simple antenna attenuator "Level treble" on the variable resistor integrated with a manual gain control. The VFO (Variable Frequency Oscillator) is running in the circuit with the chokes on 80 m and 40 m, varactors and variable resistor configuration. The stability of the VFO enough to listen to the stations. RX PCB dimensitons: 85 x 60 KIT consists of 1. KIT diy of RX board (all elements inside of the kit) 2. KIT diy of frequency meter + 7 segment 0.36" display 3. KIT diy of cabinet for receiver: - Black plastic case dimensions 150х110х78 mm - Black front and back panels. All holes are drilled. - All contrrol devices (LED, knobs for potentiometers, power switcher, sockers, plugs) - 8 Ohm Speaker - Wires for conenctions inside of cabinet - stands and screws for mounting the PCB and frequency meter Each KIT has manual in English! *RECOMMENDED FOR NOVICE IN HAM RADIO or those who want have rest for the weekend and enjoy from assembly of the simple receiver.

title: Simple Double Band Receiver Lidia-2" (40m and 80m). RX Board only
text: Product Description Receiver "Lydia-band 2" is a simple direct conversion receiver designed for listening to SSB/CW Amateur radio stations, Amateur radio developed by the Polish Wlodzimierz Salwa (SP5DDJ) at the request of the novice radio Amateurs. First and foremost, this project is intended for beginning hams, not having much experience in the design of the equipment. And for radio Amateurs who want a weekend to relax and do radio. The receiver operates in two frequency bands 80 meters (3.5-3.8 MHz for EU or 3.8-4.0 MHz for US) and 40 meters (7.0 - 7.3 MHz). In the receiver used: internal oscillator circuits, mixer and active filter. Bandpass filters at the receiver input, in spite of using axial inductors, provides the appropriate bandwidth, sensitivity, and harmonizing with the mixer. Input sensitivity of the receiver is adjusted by a simple antenna attenuator "Level treble" on the variable resistor integrated with a manual gain control. The VFO (Variable Frequency Oscillator) is running in the circuit with the chokes on 80 m and 40 m, varactors and variable resistor configuration. The stability of the VFO enough to listen to the stations. In the receiver circuit "Lydia-2 band" is possible for conneting of external VFO or DDS synthesizer. There is also the possibility to easily connect your digital frequency counter (on-Board there is built-in input circuit). Product Description Receiver "Lydia-band 2" is a simple direct conversion receiver designed for listening to SSB/CW Amateur radio stations, Amateur radio developed by the Polish Wlodzimierz Salwa (SP5DDJ) at the request of the novice radio Amateurs. First and foremost, this project is intended for beginning hams, not having much experience in the design of the equipment. And for radio Amateurs who want a weekend to relax and do radio. The receiver operates in two frequency bands 80 meters (3.5-3.8 MHz for EU or 3.8-4.0 MHz for US) and 40 meters (7.0 - 7.3 MHz). In the receiver used: internal oscillator circuits, mixer and active filter. Bandpass filters at the receiver input, in spite of using axial inductors, provides the appropriate bandwidth, sensitivity, and harmonizing with the mixer. Input sensitivity of the receiver is adjusted by a simple antenna attenuator "Level treble" on the variable resistor integrated with a manual gain control. The VFO (Variable Frequency Oscillator) is running in the circuit with the chokes on 80 m and 40 m, varactors and variable resistor configuration. The stability of the VFO enough to listen to the stations. In the receiver circuit "Lydia-2 band" is possible for conneting of external VFO or DDS synthesizer. There is also the possibility to easily connect your digital frequency counter (on-Board there is built-in input circuit).

title: HF Receiver Maria. Three Working Bands:80 Meters,40 Meter, 20 Meters. KIT DIY.
text: Product Description KiT DiY Working bands: 80, 40 and 20 meters. One of the prototypes of the proposed receiver was published in ham radio magazine in 1999. Despite the past years since the publication, the ease of assembly of the receiver, high repeatability, availability of inexpensive components allows this design to remain very popular among beginners and experienced radio Amateurs. Indeed, the ability to listen to three Amateur radio bands looks very attractive. In addition, by adding automatic gain control (AGC) to the receiver, there is a tangible comfort when listening to radio stations. Finally, the size of the PCB allows you to make the receiver lightweight and compact (dimensions 101x49mm). Direct frequency conversion receiver. The principle of this system is very simple: the heart of the receiver is the ne612 chip – a high-frequency mixer-generator, followed by the integrated circuit of the lm386 low-frequency amplifier. Since the frequency of the local oscillator (or its harmonics) is relatively close to the reception frequency, the difference is only in the low-frequency spectrum. The sum (as any good mixer subtracts and adds at the same time) is in the high frequency spectrum and as a consequence is completely suppressed by the low pass filter. There is no intermediate frequency in the receiver, which greatly simplifies this type of receiver, and the quality remains unusually good. The clarity of the signals, especially in the CW mode. Recommended for novice and experienced ham radio. Product Description KiT DiY Working bands: 80, 40 and 20 meters. One of the prototypes of the proposed receiver was published in ham radio magazine in 1999. Despite the past years since the publication, the ease of assembly of the receiver, high repeatability, availability of inexpensive components allows this design to remain very popular among beginners and experienced radio Amateurs. Indeed, the ability to listen to three Amateur radio bands looks very attractive. In addition, by adding automatic gain control (AGC) to the receiver, there is a tangible comfort when listening to radio stations. Finally, the size of the PCB allows you to make the receiver lightweight and compact (dimensions 101x49mm). Direct frequency conversion receiver. The principle of this system is very simple: the heart of the receiver is the ne612 chip – a high-frequency mixer-generator, followed by the integrated circuit of the lm386 low-frequency amplifier. Since the frequency of the local oscillator (or its harmonics) is relatively close to the reception frequency, the difference is only in the low-frequency spectrum. The sum (as any good mixer subtracts and adds at the same time) is in the high frequency spectrum and as a consequence is completely suppressed by the low pass filter. There is no intermediate frequency in the receiver, which greatly simplifies this type of receiver, and the quality remains unusually good. The clarity of the signals, especially in the CW mode. Recommended for novice and experienced ham radio.

title: The Active Low-Pass Audio Filter for Receiver (SSB 2.4 KHz or CW 1 KHz). Soldering Project KIT
text: Product Description To Significantly improve the electrical characteristics of the receiver or transceiver you may Supplement its circuit by active low-pass filter. There are many variants of circuit solutions of active filters based on operational amplifiers. The higher the order of circuit construction of the active filter, the steeper the resulting characteristics of the rays. However, this is associated with the emergence of problems of stability of the gain in the entire bandwidth and the presence of the so-called effect of "ringing", which is a consequence of not well-established transients in the circuit at audio frequencies. The proposed version of the active low-pass filter has no these disadvantages. The design of the filter has been repeated many times, and its stable and comfortable operation constantly pleases the listener. Attention! The filter scheme for SSB (2.4 KHz) or CW (1 KHz) is proposed below. The KiT contains all the elements for assembling one of the Filter. The difference between the circuits-the nominal resistors R1, R2, R4, R5, R7, R9, R10, R11, R13 - 15K (for SSB) or 33K (for CW). Resistors on the circuit are marked with an asterisk without indicating the nominal value. Product Description To Significantly improve the electrical characteristics of the receiver or transceiver you may Supplement its circuit by active low-pass filter. There are many variants of circuit solutions of active filters based on operational amplifiers. The higher the order of circuit construction of the active filter, the steeper the resulting characteristics of the rays. However, this is associated with the emergence of problems of stability of the gain in the entire bandwidth and the presence of the so-called effect of "ringing", which is a consequence of not well-established transients in the circuit at audio frequencies. The proposed version of the active low-pass filter has no these disadvantages. The design of the filter has been repeated many times, and its stable and comfortable operation constantly pleases the listener. Attention! The filter scheme for SSB (2.4 KHz) or CW (1 KHz) is proposed below. The KiT contains all the elements for assembling one of the Filter. The difference between the circuits-the nominal resistors R1, R2, R4, R5, R7, R9, R10, R11, R13 - 15K (for SSB) or 33K (for CW). Resistors on the circuit are marked with an asterisk without indicating the nominal value.

title: Forty-9er 3W Accessories, HAM Radio CW Shortwave Transmitter Receiver DIY Radio Kit, Including Unsoldered Circuit Board, Scattered Components Kit, Circuit Diagram
text: Product Description This is a very small shortwave radio transmitter receive assembled accessory for Forty-9er. The output power is raised to 3W, which has a strong remote communication capabilities, enhance the Forty-9er practicality. Coming with ciecuit diagram can guide you to install well. It has high performance and super durability, the increasing side tone circuit makes the headset can listen to the keying signal when you operate the transmitter. Specifications: Weight: 56g Board Size: 6x6cm Package List: 1 x Unsoldered Circuit board 1 x Scattered Components Kit 1 x Circuit Diagram Product Description This is a very small shortwave radio transmitter receive assembled accessory for Forty-9er. The output power is raised to 3W, which has a strong remote communication capabilities, enhance the Forty-9er practicality. Coming with ciecuit diagram can guide you to install well. It has high performance and super durability, the increasing side tone circuit makes the headset can listen to the keying signal when you operate the transmitter. Specifications: Weight: 56g Board Size: 6x6cm Package List: 1 x Unsoldered Circuit board 1 x Scattered Components Kit 1 x Circuit Diagram

title: HAM Radio CW Shortwave Transmitter Receiver Forty-9er 3W CW Shortwave Radio Transmitter Receiver Telegraph DIY Radio Kit
text: Product Description Description: This is a very small shortwave radio transmitter receive assembled accessory for Forty-9er. The output power is raised to 3W, which has a strong remote communication capabilities, enhance the Forty-9er practicality. Coming with ciecuit diagram can guide you to install well. It has high performance and super durability, the increasing side tone circuit makes the headset can listen to the keying signal when you operate the transmitter. Specifications: Weight: 56g Board Size: 6¡Á6cm Package List: 1 x Unsoldered Circuit board 1 x Scattered Components Kit 1 x Circuit Diagram Product Description Description: This is a very small shortwave radio transmitter receive assembled accessory for Forty-9er. The output power is raised to 3W, which has a strong remote communication capabilities, enhance the Forty-9er practicality. Coming with ciecuit diagram can guide you to install well. It has high performance and super durability, the increasing side tone circuit makes the headset can listen to the keying signal when you operate the transmitter. Specifications: Weight: 56g Board Size: 6¡Á6cm Package List: 1 x Unsoldered Circuit board 1 x Scattered Components Kit 1 x Circuit Diagram

title: Simple Dual-Band Amateur Receiver 20m/80m
text: Product Description For beginners radio Amateurs self-construction of a good receiver for monitoring of Amateur radio stations is associated with certain problems caused primarily by the lack of experience and the necessary measuring instruments. Widespread and low cost chips designed for home receiving equipment, allows you to create simple and easy device to repeat at home. We offer to you a dual-band receiver that provides a quite comfortable listening to stations on 80m and 20m. It does not require complicated adjustment, and contains only two coils for assembly. This is good KIT for the weekend. Technical parameters Ranges of operating frequencies: 3,5 and 14 MHz (80m and 20m) Crystal Quartz filter 4x - 5.2488 MHz Bandpass range of a receiving path (on the level of-6 dB) is 350…2700Hz Sensitivity from an antenna input, in case bandpass range 2,35 kHz, signal/noise 10 dB is 0,5 µV Level of intrinsic noises is not more than 18 mV Selectivity on the mirror channel is ~70 dB The AGC range to is ~60 dB PCB dimentions 95x50mm Power output (speakers 8 Ohms) is >50 mW DC 9-12 V, 18mA Product Description For beginners radio Amateurs self-construction of a good receiver for monitoring of Amateur radio stations is associated with certain problems caused primarily by the lack of experience and the necessary measuring instruments. Widespread and low cost chips designed for home receiving equipment, allows you to create simple and easy device to repeat at home. We offer to you a dual-band receiver that provides a quite comfortable listening to stations on 80m and 20m. It does not require complicated adjustment, and contains only two coils for assembly. This is good KIT for the weekend. Technical parameters Ranges of operating frequencies: 3,5 and 14 MHz (80m and 20m) Crystal Quartz filter 4x - 5.2488 MHz Bandpass range of a receiving path (on the level of-6 dB) is 350…2700Hz Sensitivity from an antenna input, in case bandpass range 2,35 kHz, signal/noise 10 dB is 0,5 µV Level of intrinsic noises is not more than 18 mV Selectivity on the mirror channel is ~70 dB The AGC range to is ~60 dB PCB dimentions 95x50mm Power output (speakers 8 Ohms) is >50 mW DC 9-12 V, 18mA