Clay, I think the code you are looking for is in DttSP/sdr.c in a function called do_rx_meter. I believe it is already doing what you're wanting though (i.e. calculating total power within the filter). This is pretty easy to verify with a two-tone signal generator setup. In my experience, the DSP is definitely accurate to 0.1dB (and probably a bit more).
Eric Wachsmann FlexRadio Systems On Sat, Apr 11, 2009 at 10:52 AM, Clay W7CE <w...@curtiss.net> wrote: > I've been looking through the PowerSDR code to see how the RX meter signal > strength is computed. Based on what I've observed it appears to based on > the maximum signal found within the currently selected bandwidth. So if I'm > receiving two CW signals within the current bandwidth, it will show the > strength of the stronger signal. Am I reading this correctly? If so, I'd > like to add a new RX meter option that displays the true RMS power for the > selected bandwidth and increases the display resolution to 0.1 dB. I think > this addition will allow PowerSDR to accurately display the noise floor of > the receiver when the antenna port is terminated with a 50 ohm load. The > current implementation seems to give close, but not totally accurate results > (my results seem to be off by about 1-2 dB) > > I have Microsoft Visual Studio .net 2003 and can build the source, but > would appreciate it if one of the PowerSDR gurus could help point me in the > correct direction in the source code. I think I've found most of the code, > but I'm not sure where the average signal is computed. > > Thanks & 73, > Clay W7CE > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
