Assembled S-PIXIE CW QRP Ham Amateur Shortwave Radio Transceiver 7.023Mhz + Case

Description: 1. Introduction “PIXIE” is a very small volume of simple 40 meter band micro-power amplitude telegraph transceiver, Despite it's small size and DC receiver limitations, it is capable of working several hundred miles when connected to a good 40 meter antenna. "S-Forty-9er", Designed by “LXQQFY.com”,. Improvements are as follows: z The vertical resistance is changed to horizontal resistance, Solves the problem of resistance to short circuit. z We do not distinguish between positive and negative electrodes of power supply. Power input range increased to 13.8V. z Add the buzzer sounds for send (use jumper shield), Add led signal for send. z Add acrylic shell.2. SpecificationsPower supply: 9~13.8V Volts DC, >500mA (Recommend the use of batteries)Antenna: 50ohm,7MHz,SWR<2.0Receive: static current 20mATransmission power: 1.2WFrequency: launch the vibration frequency,7023 KHZReceives the local oscillator frequency: about 7023-7023 KHZ workmode: the CWKEY: Manual Case: Acrylic3. Circuit principle See the last page of the document accompanying drawings, 9018 and surrounding components constituting a typical Colpitts oscillator and keeps oscillating (the oscillation signal leaks around 1mW) when receiving the local oscillator signal is directly coupled through a capacitor to 8050. Emission state (the key is pressed), 8050 as a class C amplifier, the amplified signal via 0.01uF capacitor coupled to a pi-type low-pass filter, and then sent to the antenna; reception state (key release), 9018 element around the beat oscillator (BFO), 1N4001 coupled with high voltage and reduce capacitive pressure is increased with the ends of the DC, the local oscillation frequency can be increased to approximately 0-3KHz 7.023MHz reception signal can be easily carried out bats frequency. 8050 is biased in the non-linear region (think transistor is nothing more than two back-to-back second diode incorrect), the signal received by the antenna with the BFO signal mixer, mixing the audio signal obtained after the 0.1uF capacitor coupling posed to the LM386 audio power amplifier, the audio signal amplified by the 10uF capacitor across the LM386 5 feet straight evacuation headphones. The key control not only the LM386-off of the power supply is switched 1N4001 varactor bias, so that the capacity of the type of state change.Package Contents :1 x Assembled S-PIXIE CW QRP Ham Amateur Shortwave Radio Transceiver 7.023Mhz + Case

Price: 14.75 USD

Location: ShenZhen

End Time: 2024-08-12T06:28:03.000Z

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