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more samples
Date: 08 September 2010
This is a printable version of www.psb-info.net/more-samples.html
More PSK31 signal trace samples
This page demonstrates a range of non real-world signal traces, generated by Milt W8NUE using either direct RF injection, or soundcard to soundcard methods.
They are provided purely for interest and information - but the closer we can get to these, the better!
Figures 1 and 2 show the resulting trace when Milton W8NUE's Kenwood TS440 (Dell Optiplex with on-board sound) transmitting, and Elecraft K2 (and Toshiba 435CDS with on-board sound) receiving.
Figure 1: IMD of -25dB, rig running 50W" title="Figure 1: IMD of -25dB, rig running 50W" />
Figure 1: IMD of -25dB, rig running 50W
Figure 2: IMD of -30dB, rig running 20W on Idle" title="Figure 2: IMD of -30dB, rig running 20W on Idle" />
Figure 2: IMD of -30dB, rig running 20W on Idle
Figure 3 shows a typcial trace when no rigs are involved (i.e. no RF), and is achieved by connecting two computers together, sound card to sound card.
Figure 3: IMD of -56dB, soundcard to soundcard, no RF" title="Figure 3: IMD of -56dB, soundcard to soundcard, no RF" />
Figure 3: IMD of -56dB, soundcard to soundcard, no RF
Figures 4 and 5 are also a direct soundcard to soundcard configuration, and demonstrate the effect that overdriving the soundcard input level can have on signal quality.
Figure 4: obtained with direct connection." title="Figure 4: obtained with direct connection." />
Figure 4: obtained with direct connection.
Figure 5: same as Figure 4, except the recording level on
the laptop was reduced" title="Figure 5: same as Figure 4, except the recording level on
the laptop was reduced" />
Figure 5: same as Figure 4, except the recording level on
the laptop was reduced