QBFreak's Blog

While looking for Linux software for my old Uniden BC895XLT, I found reference to a (now missing) BX895XLT Programming Manual. I was able to dig it up on Archive.org, and have reproduced it on my own website for posterity.

A friend was setting up an APRS i-gate with a Raspberry Pi and an RTL-SDR receiver and ran into the issue that he needed to configure it for a negative PPM value for frequency correction. When providing rtl_fm with the PPM correction, it expects it in the format of rtl_fm -p nn where nn is the PPM value. The