Clay:
You caught us!. Good catch. We will move the ADC to before the NB code. Bob On Thu, Jul 22, 2010 at 10:49 AM, Eric Wachsmann <[email protected]>wrote: > 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. > _______________________________________________ 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.
