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<DIV>Tom</DIV>
<DIV> </DIV>
<DIV>I cannot see for sure, but try putting the jumper on your LPU to disable
the -12 v. </DIV>
<DIV>You do NOT need the minus -12 v and there is known to be issues with
noise</DIV>
<DIV>from the -12v supply. I am running this with no cabinet, grounds or
ferrites with</DIV>
<DIV>no problems that I know of. Been running like this with 1 KW
plus since the </DIV>
<DIV>system has become available. </DIV>
<DIV> </DIV>
<DIV>Good luck</DIV>
<DIV> </DIV>
<DIV>73 de Joe</DIV>
<DIV>K1RQG</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 2/2/2011 7:35:21 P.M. Eastern Standard Time,
k1jj@comcast.net writes:</DIV>
<BLOCKQUOTE style="PADDING-LEFT: 10px; MARGIN-LEFT: 10px"><FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>*****
High Performance Software Defined Radio Discussion List *****<BR><BR>One of
the guys suggested I post some screen shots of the spike problem and<BR>also
pictures of the rig's layout. Hopefully someone might spot something<BR>that
has been done before.. :-)<BR><BR>Here's a thread I've been doing about the
HPSDR project on another forum as<BR>a learning experience for
newcomers. On page 8, my last two posts contain<BR>pictures of the
spikes, images and rig layout.
<BR><BR>http://amfone.net/Amforum/index.php/topic,26512.msg201631.html#msg201631<BR><BR><BR>The
Atlas is grounded on the Pandora via the posts. Should I add ground<BR>braid
to various points? I have the power supply about 6" away
using<BR>twisted pairs for the 12, -12 and 5v leads. I expect to use linear
supplies<BR>later, so did not mount the LHU piggyback. I have type 43 ferrite
snap ons<BR>on most cabling, though maybe type 73 would be better. The
USB cable has a<BR>ferrite wound with 8 turns.<BR><BR>The problems occur with
all cables plugged in OR just the USB cable and PS<BR>connected ONLY - all
other cables unplugged. Mox mouse or ext PTT key give<BR>the same results. The
rig is barefoot with no linear. The screen shots are<BR>shown at 10mW AM
carrier. The spike tracks the drive control output in<BR>amplitude.
<BR><BR>Does anyone see a problem?<BR><BR>Thanks.<BR><BR>Tom,
K1JJ<BR><BR><BR><BR><BR><BR><BR>_______________________________________________<BR>HPSDR
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