Very astute observation. If I am looking at this right, you are correct that the noiseblankers are ahead of the ADC metering. We'll enter this into our internal bug tracking system to be resolved. Thanks for the heads up!
Eric Wachsmann FlexRadio Systems On Thu, Jul 22, 2010 at 9:34 AM, Clay W7CE <[email protected]> wrote: > Based on a suggestion from Greg, I started looking at the ADC-L/ADC-R RX1 > meter readings yesterday because I suspect that there may be situations > where I'm saturating the ADC on 6M. I'm running PSDR 2.0.0 with a Flex > 5000A. On 6M I have an ARR preamp with a measured gain of 26 dB followed by > an 8 dB attenuator. This gives me the best weak signal performance in my > typical local noise environment. > > Here's the interesting observation. With a 96 kHz sample rate, NB1 and NB2 > off, -100 dBm (S 4.5) power line noise and no detectable 6M signals in the > bandpass, the ADC readings were about -28 dBFS. When I turn on both noise > blankers (default settings), the ADC drops to about -48 dBFS. I suspect > that the ADC meter samples are being picked up after the noise blanker > rather than before it. Shouldn't the ADC meter readings be independent of > anything that happens after the ADC (NB, BW, etc)? > > 73, > Clay W7CE > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used > for posting topics related to SDR software development and experimentalist > who are using beta versions of the software. > _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using beta versions of the software.
