What you are seeing is a harmonic of the AF generated by the sound card
program. These are to be expected. Some digi mode programs do a better
job of suppressing them than others.
Ti eliminate it on the RF output, define a TX filter that only has
bandwidth for the fundamental.
-Tim
---
W4TME
FlexRadio Systems - Info Management Admin.
"Tune in Excitement"
On 2/1/2010 7:36 PM, Steven L Hess wrote:
Flex-3000
Windows 7 64
PowerSDR v1.18.3
Driver Version 3.5.0.7171
Firmware 1.2.5.6
Licensed version of VAC
fldigi 3.12.5
After the Suggestion that it was RF getting into the system I I checked all my
RF grounding and re-ran my test into a dummy load with 0 RF out. The Spur is
still present in the lack of an RF presence. It was suggested I modify my
transmit filter. That isn't the way PSK31 works. How do I deal with this
visually obvious unwanted sideband transmission? Do I need to take this up with
Flex-Radio as a warranty issue?
Screen shot of Spur in PowerSDR 0 Rf
out.<http://www.slhess.com/pictures/31downnorfout.jpg>
_______________________________________________
FlexRadio Systems Mailing List
FlexRadio@flex-radio.biz
http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
