Alex,
From what I see on your plots, the frequencies of the spurs have changed.
On the BEFORE plot, I see a main signal at -9dB and the 2 major spurs
are -78 dB at 10.4 kHz and another at -77 dB at 12.6 kHz. The
difference between the main signal and the greatest spur is 68 dB.
On the AFTER plot, I see the main signal at -27 dB, but there are 2
major spurs - one at -85 dB at 5 kHz and another at -88 dB at 10.4 kHz.
The difference between the main signal and the greatest spur is now only
58 dB - all in all a worsening of the signal to spur ratio.
73,
Don W3FPR
Alexander Ponomarenko wrote:
Hi Eric,
may be error in schematic, may be in my head. :)
Please look on these new plots:
here is plot with s9-level signal from XG1 BEFORE replaced W16:
http://forum.cqham.ru/download.php?id=32057
and here is plot with s9-level signal from XG1 AFTER replaced W16:
http://forum.cqham.ru/download.php?id=32650
Please, any yours comments.
73!
Alex UR5LAM
Eric Swartz - WA6HHQ, Elecraft wrote:
The schematic is in error. It was found that the coax was unnecessary.
The levels of signals reported are not audible at greater than 50-60
dB down from normal signals and do not impact our sensitivity spec.
73, Eric WA6HHQ
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