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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 3495 kHz - 3805 kHz and 6995 kHz - 7105 kHz. The main element is a MC3361, which is used in 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.
In the receiver circuit "Lydia-2 band" it 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).
RX PCB dimensitons: 85 x 60KIT consists of1. KIT for assembly the PCB. all elements and English manual included.2. KIT for assembly of frequency counter + LCD 7 segment 0.36"3. KIT for assembly the case for receiver:- Plastic case dimensions 164х120х69 mm-Black front and back panels.-All contrrol devices (LED, knobs for potentiometers, power switcher, sockers, plugs)To build the receiver needs the following instrument:- soldering iron + accesories- drill - to make a holes in front panel (*the hole for LCD is done)- screw driver to adjust the trimmers and complete a housing.- head phones (*can be used any standard headphones 3.5mm or 6mm - both sockets in a kit)The assembly and adjusting takes 3-4 hours.*RECOMMENDED FOR BEGINNERS IN RADIO or those who want have rest for the weekend and enjoy from assembly of the simple receiver.