Other than being -80 dB down and not really significant, what you are
seeing is the sidebands generated from your digital mode program.
What digital mode program are you using?
A sampling rate down-conversion mismatch can cause that.
http://kc.flexradio.com/KnowledgebaseArticle50504.aspx
Using a 300 Hz wide TX filter will eliminate them. Just draw in the TX
filter band edges while transmitting until the unwanted sidebands are
suppressed.
-Tim
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Product Management, Sales & Support
FlexRadio Systems^(TM)
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On 10/3/2011 6:06 PM, Larry da Ponte wrote:
I have always wondered if my (see link for screen shot) PSK signal as it
displays on the Flex 3000 PSDR 2.2.3 water fall is normal. It seems there is
some sort of signal on either side of the central peak during TX. I have the
output set so that ALC is zero. Running Windows 7 64 bit. I get good signal
reports and have no complains of being too wide etc. Just curious.
http://n7bcp.daponte.net/download/PSK TX.PNG
Thanks
Larry
N7BCP
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This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for
posting topics related to SDR software development and experimentalist who are
using beta versions of the software.
