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.
