While working with Rob, AI6VN, and Phil, VK7JJ on making sure that the
WsprDaemon package was uploading all of the WSPR spots it decoded I saw
that my own upload success rate for a single instance of WSJT-X 2.4 on a
Pi4 could be below 90%. This led to a more in-depth study with the
headline findings listed below.
This is a different issue to topic
http://www.wsprnet.org/drupal/node/8776 started by Jim, WA2ZKD, on spots
that had arrived being dropped by wsprnet.org - this issue is with spots
that never arrive.
I have not found a root cause, consequently I do not know whether the
success rates could be improved by changes at wsprnet.org or within the
WSJT-X package. Hence I'm posting to both forums. Any insights from this
community would be most welcome. There is a detailed report at
https://www.dropbox.com/s/pihb3ljy6aa0jse/Upload_success_rate.pdf?dl=0
Summary of findings
1. The upload success rate with WsprDaemon is 100%. Spots are uploaded
in bulk using MEPT (curl to http://wsprnet.org/meptspots.php).
2. The upload success rate using KiwiSDR WSPR 1.3 extension is about
99.9%. Most of these spots arrive well after those from WSJT-X and
WsprDaemon within a two-minute interval.
3. The upload success rate for WSJT-X depends on type of computer used,
affected by the load on the wsprnet.org server, and varies with time of
day. Success rates for a Pi4B running a single instance of WSJT-X range
from 88% to 97%. Success rate for Mac Mini, Macbook pro and an HP i5
quad-core 1.8 GHz laptop with Windows10 varied from 99.5% to 99.9%.
These are averages over many hours, there were instances of no spots
being uploaded in some two-minute intervals.
4. Examination of TCP transactions for failed spot uploads show
instances of no receipt of acknowledgements from wsprnet.org yet POSTs
from the WSJT-X client and wsprnet.org resetting the connection. WSJT-X
itself seems not to retry failed uploads.
5. It's not easy to draw a conclusion from an analysis with Spotnum as a
proxy for time of uploads within a two-minute interval. In particular we
cannot reconcile the relative 'tightness' of the Pi4 spots' Spotnums,
suggesting the spot-by-spot uploads were not drawn out in time, with the
fact that only 9 out of 24 were uploaded in that interval.
Gwyn G3ZIL
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