Kenwood TS-850 Memory Backup Battery Replacement

Kenwood TS-850 Memory Loss

Because of the age of the design and components used, the circuit uses a RAM chip. Using RAM has a drawback in that it requires power to retain information. This power is supplied from a small memory backup battery. Modern designs use NVRAM (Non-Volatile RAM) which retain the information without requiring power. Read Complete Article...

Yaesu FT-747 Internal USB Soundcard Modification

How I modified the Yaesu FT-747 to incorporate an internal USB soundcard to allow it’s use on digital modes. The modification has a minor downside, this being that the microphone is open while transmitting signals via the USB soundcard. The only way around this problem without building an audio switching circuit is to remove the microphone from the radio. Read Complete Article...