I refer you to a previous msg of mine a few days ago about Images. Looking
at a broad band spectrum one cannot distinguish between genuine signals and
IMAGES. I described how to distinguish the genuine signal from an IMAGE by
using a narrow band RX and tuning the spectrum of interest and watching on a
spectrum display.
Profession Radio Officers are familiar with this procedure but Appliance
Operators are not.
de G3KEV
----- Original Message -----
From: "pws" <[email protected]>
To: <[email protected]>
Sent: Wednesday, January 26, 2011 4:42 PM
Subject: Re: LF: Plot made in N.Germany until 0700z
> Hi again Jurgen,
>
> You wrote:
> > ...
> > The 20kHz line seems to be a product of SpecLab using Perseus
> > ...
>
> It's a "ghost" of MSF, 60 kHz, which is incredible strong over there.
> All other signals appear twice in your plot shifted by +20 kHz.
>
> I don't know what happend since I do not know (in depth) Perseus and
SpecLab.
>
> Peter
>
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