HF Amateur transceiver "Druzhba-M" is intended for Amateur radio communication SSB and CW on all HF bands from 160 to 10 m (depends of bandpass filters you using with). It is a further development of the transceiver "Desna" and represents a design available for building for the radio Amateurs of average skill. In the design of the transceiver "Druzhba-M" the goal was to create an inexpensive device with acceptable electrical characteristics with use of commonly available components, a good price/value relation and no technical limitations. This design does not contain any original circuit design This is a constructor of units previously described by other authors and well known in the World. The main Board is easy for adjustment and is well proven and tested in serial production in Ukraine. Technical characteristics: - The sensitivity of the receiving path when the ratio signal / noise 10 dB, no worse than 0,25 µV; - 2-signal selectivity in the detuning signal of 20 kHz at least 80 dB; - Adjustment range of Automatic Gain Control (AGC) not less than 80 dB when the output voltage changes on 6 dB; - The output of the transmitting part of the transceiver 10 Watts. The motherboard has a crystal filter 8.867MHz. The technical characteristics of crystal filters are below: -crystals 8,867238 MHz -the Squareness ratio in levels 6 and 60 dB – 1.5 – 1,7; -attenuation over a bandwidth of more than 80 dB; -flatness in the passband is 1.5 - 2 dB; -the bandwidth at a level 6 dB – 2.4 ± 0,15 KHz; -input and output resistance of 202±10 Ohms. HF - transceiver "Druzhba-M" is a CONSTRUCTOR! It was devided to few functionally Units that you may choose separately: - MotherBoard v4.61; - CURRENT KIT - Bandpass filters “BPF-9” (9 bands) or “BPF-6” (6 bands) - The Power Amplifier Unit (we have 30 or 10W-40W for choose); - Low-pass filters 12V or 24V - Variable-Frequency oscillator (VFO) - Digital frequency counter or LC