I thought I had this issue resolved but I find that it was not. I'm
wondering if anyone else using (or that used) a SDR-1000 is experiencing
the same issue.
After install 1.18.3 the noise floor increased from less than S1 (dummy
load) to S6.5 on 20-meters. The issue seems to be most obvious on 17,
20, 30 and 40 (to some degree). I thought I had the issue resolved a
couple months ago by uninstalling 1.18.3 and reinstalling it. But what
I had was something that was better but not resolved and after
re-calibration it was obvious the problem still existed.
Considering 1.18.2 as the baseline version and all testing into (or
from) a Dummy Load, the following comparison can be derived:
1.18.2 shows S1 (+/- .5) for the noise across all bands.
1.18.3 shows a noise floor of:
S1 on 10, 12, 15
S6.5 on 17
S7.5 on 20
S6.5 on 30
S2 on 40
S7 on 60
S6.5 on 80
S5.5 on 160
Once a fresh copy of 1.18.3 is installed I step through calibration
procedure starting with PA Settings. After each calibration step, I
would check the noise floor on all the band edges comparing the in-band
to out-of-band noise floor. Generally the noise floor on 20-meters
would remain around S3 until doing the RX Image Reject Calibration.
Once the RX Image Reject Cal was complete, 20 should show a S7 noise
floor. I re-calibrated version 1.18.2 and each step of the way the
noise floor remained S1 +/- .5 all bands, so 1.18.2 reacts much better
then 1.18.3 when doing an apples-to-apples comparison.
After reloading the software and re-calibration, the band edges tests
for 17 through 40 would show S1 +/- .5 for out-of-band and a high noise
floor in-band. This condition could easily been seen when looking at
13.999999 with a S0.5 noise floor and tuning to 14.000000 which shows a
S7 noise floor. Also, tuning between in-band and out-of-band would
produce a switching sound in the SDR-1000 on all bands except 15, 12,
and 10 meters.
When using 1.18.2 the above condition does not exist. Therefore when
tuning from 13.999999 to 14.000000 the noise floor remains the same and
the SDR-1000 is not being switched. By "not being switched", I mean
there is no relay sound heard when tuning from out-of-band to in-band
and visa-versa.
The XP Pro system is a quad-core that has been running a couple years
with little change (other than Microsoft trying to mess with me from
time-to-time). It is dedicated to the radio plus one Video Editing
piece of software.
NOTE: Reload process for 1.18.3 is:
1. Uninstall 1.18.3
2. Delete the 1.18.3 directory from Program Files
3. Reboot
4. Install the software for 1.18.3
5. Reboot (I have reverted to 98 procedures... when Microsoft
systems were definitely com-booters)
6. Run pSDR/configure
7. (sometime an extra boot just because it is an MS OS)
Any ideas?
Thanks and 73,
Dan - W0RO
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