On Tue, Mar 1, 2011 at 4:20 PM, John Shaw <jns...@internet.co.nz> wrote:

> You are correct with the . In the left column.  Not much we can do about
> that, if people keep uploading their whole logs over and over they will keep
> showing up on this list.  For those LoTW users who do this, you may not
> think it a problem but it can be.

This problem isn't caused by "people ... uploading their whole logs
over and over".  If I upload an identical QSO that is already in LoTW,
it won't be considered a new match.

I tried to explain what really causes this problem in my application
note on LoTW.  I'll explain it again here.

At 1200z on 1 March, you download your LoTW report.  It contains all
the new QSO matches up to and including the ones that were made before
12z on the 1st.

Now on March 7, you download the report again.  It gives you the
option of the date to start with.  It will most likely be set to 1
March.  So when you download the report, you will get all the QSO
matches made on 1 March again.  This includes the QSOs that were
confirmed before 12z on 1 March, which were in your previous download.

Let's say that on 7 March, you decided to start on 2 March instead.
What about the QSOs that were matched between 12z and 24z on 1 March?
Those *won't* be in the lotwreport file, because you didn't download
any QSOs from 1 March.  The only confirmations you have from 1 March
will be those that were matched in LoTW between 0z and 12z.  So unless
you can download your lotwreport file at precisely 0000z (1/3 of the
world is asleep during that time), there will always be a little bit
of download overlap, resulting in the "already matched" warnings when
you import the report into DX4WIN.

John, I apologize for not reading the rest of your message.  I will do
so now. I just wanted to explain why there are sometimes duplicates.

73 - Jim AD1C

-- 
Jim Reisert AD1C, <jjreis...@alum.mit.edu>, http://www.ad1c.us
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