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<DIV>Or, could it be an image into a poor FM rig? The difference between
144.39MHz and 122.88MHz is 21.51MHz. Divide that by two, and you get
10.755MHz, 55kHz off the 10.7MHz IF of many VHF rigs. Is that too far
away, what if one of the other is off a little?</DIV>
<DIV>Terry, WB4JFI</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=stevezsuzska@iinet.net.au
href="mailto:stevezsuzska@iinet.net.au">Steve Hubbard</A> </DIV>
<DIV><B>Sent:</B> Friday, September 09, 2011 8:41 PM</DIV>
<DIV><B>To:</B> <A title=hpsdr@openhpsdr.org
href="mailto:hpsdr@openhpsdr.org">'OpenHPSDR ' (open)</A> </DIV>
<DIV><B>Subject:</B> Re: [hpsdr] Mercury Spurious Emissions</DIV></DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">*****
High Performance Software Defined Radio Discussion List *****<BR><BR>
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The 47th harmonic of 3.072 MHz is 144.384 MHz, which is close to 144.39 MHz.
3.072 MHz is 122.88/40 and appears as CBCLK on the Mercury block diagram. If
this signal has fast enough edges, this could be where your spurious is coming
from. I don't have a Mercury myself so this is just speculation.<BR><BR>Steve
VK5SH<BR><BR><BR><BR><SPAN style="FONT-WEIGHT: bold">On Sat Sep 10 9:22 , Jeremy
McDermond <MCDERMJ @XENOTROPIC.COM>sent:<BR><BR></MCDERMJ@XENOTROPIC.COM></SPAN>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(245,245,245) 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">*****
High Performance Software Defined Radio Discussion List *****<BR><BR>I've been
"doing the rounds" of some of the local hamfests with my OpenHPSDR rig over
the past couple of weeks and have run into a problem today. It seems as if
Mercury is radiating spurious signals into the antenna connector. The symptom
is showing up on 144.390 MHz. I have tried removing all boards from Atlas
besides Mercury and pulling JP7 on the board to turn off the 10MHz clock. The
signal is full-scale on an FM rig located near the receiver. When the antenna
is removed from the BNC connector, the signal is much weaker, but a handheld
near the box will still pick up the signal. Since it's happening with the
10MHz clock powered off, I'm assuming it has to be some issue with one of the
clocks derived from the 122.88MHz clock. Not really sure where to start or
whether folks have ideas on what could be the issue here.<BR><BR>--<BR>Jeremy
McDermond (NH6Z)<BR>Xenotropic Systems<BR><A
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