[Skimmertalk] What causes audio images with QS1Rs?
Pete Smith N4ZR
n4zr at contesting.com
Sat Feb 23 16:30:12 EST 2013
During the ARRL CW contest, we had two Skimmers using the QS1R/Skimmer
Server combination that each produced many false spots, with the
"signature" commonly associated with Skimmers using simple SDRs, ones
which rely on a computer sound card for A/D conversion. That is, the two
spots are spaced equidistant from the receiver's center frequency, one
is significantly stronger than the other, and they arrive at the server
typically within the same second.
We're having no luck isolating what is different about those particular
systems. So far we've ruled out inadequate power supplies, and the idea
of excessive gain before the receiver doesn't look promising. Does
anyone have any theories we can explore? I'll be glad to provide the
data in Excel format for anyone who wants it.
Thanks in advance!
73, Pete N4ZR
Check out the Reverse Beacon Network at
blog at reversebeacon.blogspot.com.
For spots, please go to your favorite
ARC V6 or VE7CC DX cluster node.
More information about the Skimmertalk