... From: praveen r Subject: [softrock40] Earth loop with Softrock 6.3 - Experts opinion request ... From my page One thing that is sometimes not expected
Message 1 of 2
, Jan 3, 2011
----- Original Message -----
From: "praveen r"
Subject: [softrock40] Earth loop with Softrock 6.3 - Experts opinion request
> i read about the earth loop problems.
> How can it be identified
> How to avoid that without optocoupler and transformers ( as like ensemble
From my page " One thing that is sometimes not expected is a "spike" in the
centre of the SDR program's waterfall. This is normally obvious unless a
very good soundcard is used.
What should not be normal is a "mound" each side of this spike. The Softrock
is very sensitive to ground loops (earth loops in UK!) and should be
connected to the computer ground by just one link. Experiment, anything else
that is connected to the Softrock may also ground to the computer in a way
that is not obvious. For example a PSU may be grounded, in that case try
just connecting the positive to the Softrock. An isolated PSU would be best.
I usually find that the audio cable ground is the best, anything else
connecting the Softrock to the computer has it's ground connection broken.
It is best to get this right before putting the board in a case, when you do
insulate any sockets put on a metal box so a ground loop is not introduced.
Try to avoid making and breaking connections when power is applied."
73 Alan G4ZFQ
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