[hpsdr] Penny PTT unkeying spike - T/R sequencing?

Wed Feb 2 17:12:21 PST 2011

Tom

I cannot see for sure, but try putting the jumper on your LPU to disable  
the -12 v. 
You do NOT need the minus -12 v  and there is known to be issues with  noise
from the -12v supply. I am running this with no cabinet, grounds or  
ferrites with
no problems that I know of. Been running like this with 1 KW  plus since 
the 
system has become available. 

Good luck

73 de Joe
K1RQG

In a message dated 2/2/2011 7:35:21 P.M. Eastern Standard Time,  
k1jj at comcast.net writes:

*****  High Performance Software Defined Radio Discussion List *****

One of  the guys suggested I post some screen shots of the spike problem and
also  pictures of the rig's layout. Hopefully someone might spot something
that  has been done before.. :-)

Here's a thread I've been doing about the  HPSDR project on another forum as
a learning experience for  newcomers.  On page 8,  my last two posts contain
pictures of the  spikes, images and rig layout.   

http://amfone.net/Amforum/index.php/topic,26512.msg201631.html#msg201631

The  Atlas is grounded on the Pandora via the posts. Should I add ground
braid  to various points?  I have the power supply about 6" away  using
twisted pairs for the 12, -12 and 5v leads. I expect to use linear  supplies
later, so did not mount the LHU piggyback. I have type 43 ferrite  snap ons
on most cabling, though maybe type 73 would be better.  The  USB cable has a
ferrite wound with 8 turns.

The problems occur with  all cables plugged in OR just the USB cable and PS
connected ONLY - all  other cables unplugged. Mox mouse or ext PTT key give
the same results. The  rig is barefoot with no linear. The screen shots are
shown at 10mW AM  carrier.  The spike tracks the drive control output in
amplitude.  

Does anyone see a problem?

Thanks.

Tom,  K1JJ

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