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Date: 05 September 2008
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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.
<h5>Figure 1: IMD of -25dB, rig running 50W</h5>
Figure 1: IMD of -25dB, rig running 50W
<h5>Figure 2: IMD of -30dB, rig running 20W on Idle</h5>
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.
<h5>Figure 3: IMD of -56dB, soundcard to soundcard, no RF</h5>
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.

<h5>Figure 4: obtained with direct connection.</h5>
Figure 4: obtained with direct connection.
<H5>Figure 5: same as Figure 4, except the recording level on<BR>the laptop was reduced</h5>
Figure 5: same as Figure 4, except the recording level on
the laptop was reduced