Hi, Joe,
I had informally 'thought' I noticed this over past couple of years but
didn't 'look for it' in any systematic way. This year, I didn't write
down numbers, but planned before the contest to consciously note if
this was in fact the case: that the LT2S Mk II and the FT1000MP outdid
the WSE boxes with WSJT.
This past weekend when I looked for this effect systematically, I
noticed that the conventional system did do better in that the dB
numbers were pretty consistently 2-4 dB better [less negative] with the
conventional system than with Linrad. But the two systems performed
equivalently in terms of decoding the signal.
It might be that this was due to not setting the polarization angle as
well with Linrad as I did by just selecting H or V with the FT1000
setup.
Again, for me it was a difference in the 'dB' indication, not a major
difference in decoding. In the past I had thought that the Linrad
chain did an inferior job of decoding. But when I specifically looked
for that, it didn't pan out. I had with each system one or two
instances where it missed the decode while the other one picked it up.
But there was no systematic difference in this regard by my informal
study.
I hope that helps. It is what I remember now, and what I see that I
typed in my email to the list when things were fresher in my mind, so I
think it is a true reflection of what I noticed.
Have a great week, and
73,
W3SZ
Roger Rehr
http://www.nitehawk.com/w3sz
Quoting Joe Taylor <[EMAIL PROTECTED]>:
Ermanno, Roger, and all --
One thing about your recent posts concerning Linrad and WSJT surprises
me. You both say that Linrad helps you to find JT65 signals, but the
signals seem to be decoded better when received by a conventional receiver.
I have certainly not noticed this effect, but my on-the-air experience
with Linrad is still minimal. I have not done any explicit side-by-side
comparisons. However, I have a hard time trying to understand what the
origin of such an effect could be. I think it's important to find out,
and I would welcome any additional information, reports of further
measurements, detailed documentation, etc.
-- Joe, K1JT
PS to Ermanno: I will send you my parameter files soon. Very busy over
the past several days, hihi.
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W3SZ
http://www.nitehawk.com/w3sz
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