Be sure to set the filter bandwidth the same on both versions. 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 4:03 PM, Clay W7CE <[email protected]> wrote: > Gerald, > I tried what you suggested and reset the database for both 2.0.8 and > 2.0.16. PowerSDR 2.0.16 still shows the noise floor, as measured by RX1 > Meter in "Sig Avg" mode, to be 3 dB higher than 2.0.8. Using SpecJT, both > versions show the same average noise power when AF and AGC-T are set to 50 > and 60, respectively. It appears that something has changed in the way the > S-Meter reading is calculated. Rough calculations based on RX noise figure > and current sky temperature, lead me to believe that the 2.0.8 reading is > more accurate. > > I'm getting ready to hook up my 5000A, which I just got back with the V/U > upgrade, and will see if it behaves similarly. I'll also try the 1500 > later. > > 73, > Clay W7CE > > > On 11/12/2010 6:11 AM, Gerald Youngblood wrote: > >> 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] <mailto:[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] <mailto: >> [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] <mailto:[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.
