A problem has been detected with carrier reception at frequencies offset by +275 kHz. For example, 434.0 and 434.275 MHz.
We demonstrate this problem in the video. We find out problems with transmission or reception, measure the sensitivity at the affected frequency. We assume that this applies to radio stations with a Beken BK4815 receiving chip.
The problem has been found on the following radios so far:
1.TYT TH-UV88.
2.TYT TH-UV98.
3.Racio R620.
4. Retevis RA685.
The list will be updated.
Equipment used in the video:
- HP E4400B Signal Generator
- TinySA Spectrum Analyzer
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10 ноя 2022