? Complete with block diagrams, the trace layouts of the board, and the component-level schematics? That was a ghost. QYT simply didn’t publish them to the public.
If your radio won't "write," try a factory reset. Power off, then hold the PTT and FM buttons while turning the power knob back on for 5 seconds. qyt kt7900d service manual
≤0.25μV (Wide Band) / ≤0.35μV (Narrow Band). Core Programming & Maintenance ? Complete with block diagrams
The service manual instructs: Connect a 50-ohm dummy load and an accurate wattmeter to the antenna port. Set frequency to 146.000 MHz (VHF) or 445.000 MHz (UHF). the trace layouts of the board