Clay, Try starting with a clean database on both versions. This is probably calibration data in the database and not an actual change in the noise floor.
Gerald Gerald Youngblood, K5SDR President and CEO FlexRadio Systems(TM) 13091 Pond Springs Road, #250 Austin, TX 78729 Phone: 512-535-4713 Ext. 202 Email: [email protected] Web: www.flexradio.com <http://www.flex-radio.com/> Tune In Excitement (TM) PowerSDR(TM) is a trademark of FlexRadio Systems On Fri, Nov 12, 2010 at 1:39 AM, Clay W7CE <[email protected]> wrote: > I just installed 2.0.16 on a Win7 Ultimate 64-bit machine (upgrading from > 2.0.8). Initially, I'm running it with a Flex 3000, and it upgraded the > firmware in the 3000 to 2.0.4.1. The FlexRadio Firewire driver stayed the > same at 3.5.2.8028. After initial manual setup, I checked the local noise > floor on 6M with the antenna pointed in what is typically my quietest > direction and with the antenna elevated 40 degrees (to minimize the effects > of any man-made QRN). The noise floor seemed high, so I shutdown 2.0.16 and > started 2.0.8. It seems to work with the firmware upgrade, so I went to the > same frequency and the indicated noise floor is 3 dB lower (better). > Several iterations of switching versions yielded the same results. As far > as I can tell, the two versions are configured identically. Both versions > of the software are set to USB, 2.7k BW with the NB and SR off. Also the > RX1 Meter is set to "Sig Avg" in both cases, and they both have AGC-T set to > 69 and Pre2 selected. I've also noticed that the noise displayed in the > panadapter seems to have a larger range of min and max peaks on 2.0.16 > compared with 2.0.8. > > Why do the two versions show a different noise floor when used with the > same receiver and antenna? Also, if there is a reason for the difference, > which is more accurate? > > Tomorrow I should get a chance to try 2.0.16 with a Flex 5000A and a 1500. > It will be interesting to see if there are differences in the indicated > noise floor on those two receivers when I switch PowerSDR versions. > > 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.
