On 24/11/2018 23:56, Stephen Ireland wrote:
Jesus,
I am making similar observations – well its hard to observe at the
moment as I am seeing little here in VK; issues are beyond propagation
as v1 signals boom in (especially for some reason from EA).
One must always delete the wsjtx.ini when one heads back to a
different version; the best way to overcome this issue is to start
wsjt-x with command line parameters for a second rig: i.e.
C:\WSJT\wsjtx192\bin>*wsjtx.exe --rig-name=Second*
<...u nrelated waffle snipped>
We have had no credible evidence of reduced sensitivity in WSJT-X v2.0.0
RC4 FT8 mode, yet. Clearly there are a lot less decodable signals but
that is simply because most operators are still using v1.x or v2.0.0
RC1, 2, or 3 in 75-bit transmit mode all of which are incompatible with
v2.0 RC4's 77-bit only decoder.
There is absolutely no need to delete the WSJT-X settings (.ini) file
when reverting to an older version, that is a waste of your time. Some
settings values used only in the newer version will be lost when
returning back to the newer version but settings values common to both
versions will be preserved correctly without issues.
If you suspect a lack of sensitivity in WSJT-X v2.0.0 RC4 FT8 mode then
you must first determine if the same signals that cannot be decoded are
in fact 75-bit messages, this can be done by enabling "Menu->Save->Save
All" then switching to v1.9.1 and decoding the saved .WAV file recorded
in v2.0.0 RC4. If they decode there then they *must be* 75-bit and could
not have been decoded in v2.0.0 RC4 regardless of sensitivity. If they
don't decode in v1.9.1 either; then clearly there is no *loss of
sensitivity* but hey may be a different mode e.g. JS8CALL.
The only way to check the sensitivity of the 75-bit and 77-bit decoders
on air is to do a controlled test. Two stations must cooperate and run
decoding tests with reducing power levels to determine the decoding
threshold with each decoder. Obviously this is not trivial as QRM, QRN,
and propagation variation will all skew the result sets. A large enough
sample size will be required to get any confidence in the validity of
the test results. How you determine the required sample size is even
less trivial due to the random nature of the interference.
73
Bill
G4WJS.
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