JJJ TX0109 is an 80 meter band CW (Morse) transmitter



JJJelectronics- RF Mixer with audio pre-amplifier* Hi Performance RF Mixer (MC1496)* Pre-amplifier ,Audio stage * Voltage 11v-13.5v * voltage regulator* can be used as product detector, Beat frequency oscillator (BFO) and heart of direct conversion receiver the output frequency is the difference between the VFO frequency and the input frequency (for example input filter ) Tool required.Soldering iron (25w-40w), small cutter, trimming tool Now let’s build the mixerI would recommend fitting the parts in the order they appear in the part list.Resistor first, then semiconductors, coils and Capacitors.Make sure you put the electrolytic capacitors and diodes in the right way round .keep all components leads as short as possible.When you have finished assembly of the board, check all the parts are in the right places.The soldering looks bright and good. Re-solder any suspect joints with a little fresh solder, check that there are no short or splashes of solder between tracks. ResistorsR1150R1R2, R61k2R3100k1R4, R733k2R5, R142k22R8820R1R9, R10390R2R118.2k1R12, R13, 2.7k2R151.2k1Picture is for illustration only; components may not be the same Transistor, Diode and ICD1Zener 8.2v1D21N40041IC1MC14961IC2TL0711CapacitorsNote: You will find the some capacitors values on a paper with your orderC1, C5, C13, C14100nf4C2See note above1C31uf1C4, C6, C8See note above3C747nf1C9, C10, C11, C12See note above4C1547uf1C3 and C15 are electrolytic capacitors and must be installed the correct way round. The Longest lead is normally positive; this lead should go to the hole marked“+“ on the circuit board. Picture is for illustration only; components may not be the same MiscellaniesBinocular ferrite coreYou have to make 2 coilsWind 8 turns of the thin enameled yellow wire tightly onto the two holes balun core. Passing the wire through one hole and then back out of the other counts as one turn. Do this 8 times for eight turns. Both ends of the wire should project from the same side as shown.Wind 2 turns of the enameled yellow wire as shown.You have to remove the varnish from the enameled wire ends, you can use fine sandpaper or you can use hobby knife.Solder 8 turns to Pin 1 and 4 Solder 2 turns to pin 2 and 3 Testing2 methods to check this mixer 1: with my filter , audio amplifier and VFO *Connect a power supply to +12v and GND * Connect the filter , VFO and audio amplifier to the mixer*Tune the VFO to find a CW signal2 : You need an oscilloscope and 2 signal generators* connect the oscilloscope to the output of the mixerConnect 2 signal generator to the VFO-IN and FLT-IN and Put both signal generators to1MHz (you can choose any frequency)Adjust one signal generator so that the differences between them is about 5khz You can read the frequency and the shape from your oscilloscope * You can make a good receiver with this mixer, just connect VFO and connect filter, with suitable audio filter /audio power amplifier. ................
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