1、Original version http://qsfj.com/products/3268 Scroll all the way down.
2、CEC firmware (CW, SSTV)
3, fagi spectrum firmware, with S table, USB, channel name/frequency dual display, AM reception optimization, without the above other modifications, F+5 to start the spectrum.
4、 K6 wideband firmware, full-band transmission, supports AM mode from 18MHz to 1300MHz.
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