--- In digitalradio@yahoogroups.com, "Danny Douglas" <[EMAIL PROTECTED]> wrote: My > waterfall is set up to cover about 4 KC, thus 14.070 on the left side of the > waterfall, and 14.074 on the right. The signal then lies 1500 cy from the > left side of the waterfall screen. Some people set this up so that their > "copy" signal is right smack dab in the center of the waterfall. My sound > card doesnt like that, and reduces my output power that far to the right, so > I keep it center left.
I don't think you should be blaming the soundcard for reducing the output level as it is more likely to be your USB filter which is the cause. If you have set the soundcard to the centre of the waterfall then you will be centred on 2KHz. For PSK31 this is probably fine, but if you have a 2.1KHz filter in your radio and are running a wider mode then the top audio will rolloff very quickly. This is why people centre on 1.5KHz which is effectively the centre of the voice passband. My own radio rolls off the power very quickly below 600Hz and above about 2300Hz. Try it. Send just a test tone and measure the transmitted RF level with a wattmeter, and increase the frequency of the tones in 100Hz steps. You'll soon get a feel for the "useable" bandwidth of your rig. As a result, I have zoomed my waterfall to only show 2.5KHz bandwidth and slid it slightly to the left to not display anything below 400Hz. Brad VK2QQ The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ <a href="http://dxcluster.blogspot.com";><img src="http://feeds.feedburner.com/DigitalSpotter.gif"; height="67" width="200" style="border:0" alt="Digital Spotter"/></a> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
![http://feeds.feedburner.com/DigitalSpotter.gif"](http://feeds.feedburner.com/DigitalSpotter.gif"){kind=link}