|
Hi Bob,
despite somewhat higher noise, your keyed carrier
made a nice 10 dB peak in the 106 uHz opds-2H spectrum around 5 UT. Not
significant in 424 uHz, and of course no chance to "read" the morse
here.
BTW yesterday I changed the samplerate for the two
29.5 kHz SpecLab instances from 96 to 64 kHz nominal (the "Realtek HD" driver
produced 96003 and 64202 samples/s respectively). As expected, this brought the
combined CPU load down from ~ 30% to 20% on a small Atom netbook, quieting the
fan. I found that I also had to modify the L2 Bessel bandpass filter
(now 30 kHz center and 1 kHz bandwidth). The frequency response and
gain of these IIR filters tends to deviate from the desired values if the
relative bandwidth is large or the center is close to an edge of the
Nyquist band.
73, Markus (DF6NM)
Sent: Saturday, March 15, 2014 10:19 PM
Subject: LF: 29.499 QRSS 120 tonight start 2330...
WH2XBA/1 [XBA] will run QRSS 120 for the evening-all captures
appreciated-Bob
|
