Dimensions: 104*71*25mm (excluding the protruding part such as knob)
Operating voltage: 8-15VDC.
receiving: about 45mA(backlight on), and less than 40mA(backlight off).
transmitting: about 0.8A (at 12V voltage).
Frequency range: 5-8MHz, 8-11MHz, 11-16MHz (the receiving sensitivity peak is only 40m, 30m, 20m amateur band).
Transmitting: 7.0-7.2MHz, 10.1-10.15MHz, 14.0 -14.35MHz.
RF output: 5 watts @12V
1.8 – 2 watts @9V
We’ve been using DDS chip Si5351 in the SW-3B’s with good results,but recently we could not find any good quality Si5351’s on the market,many of the chips fails in short time operating.
Recently we’ve channged the DDS chip from Si5351 to AD9834,which seems good.Unfortunately,due to different MCU data format,it seems cause some birdies on the particular frequencies mostly on 40m.
And Si Lab informs they are manufacturing Si5351’s in October,so at this point,we are focusing the new SW-3C,which is also a 3 band QRP CW tranceiver with a bit more features and different case,we should have SW-3B back in October as well.
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