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.
