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<p class=MsoNormal><span lang=EN-US>Hi Brian,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>The ADC clipping level is typically + 5 dBm
and in the given configuration with a 20 dB fixed gain preamp the limit for the
total array is -15 dBm. With the 31dB maximum step attenuation in front the RX
input limit is 16 dBm, far below the device ratings of the DAT-31. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Assuming an external 1kW-amp (+60 dBm) and
a 30 dB coupling loss of the RF sampler you need an additional pad with at
least 14 dB attenuation. If you run the system under that these extreme
conditions (without the possibility to adjust slight deviations in the
frequency response of the RF coupler) it should be verified that NO additional
distortion is generated in the DAT or preamp in the entire frequency range.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>All testers, who used a RF tight Hermes RX
port, had not issues with the PS performance. No further comments regarding
stray coupling, hi.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>73, Helmut, DC6NY<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
hpsdr-bounces@lists.openhpsdr.org [mailto:hpsdr-bounces@lists.openhpsdr.org] <b>Im
Auftrag von </b>Brian Lloyd<br>
<b>Gesendet:</b> Mittwoch, 26. Februar 2014 18:07<br>
<b>An:</b> Bill Diaz<br>
<b>Cc:</b> hpsdr@lists.openhpsdr.org<br>
<b>Betreff:</b> Re: [hpsdr] Comments on setting up PureSignal<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>On Wed, Feb 26, 2014 at 10:49 AM, Bill Diaz <<a
href="mailto:william.diaz@comcast.net" target="_blank">william.diaz@comcast.net</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>***** High Performance Software
Defined Radio Discussion List *****<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Brian,<br>
Based on extensive testing by Mukesh, KE3VG, with a ClearRF
sampler, good results were achieved on 20 and 40 meters when the external
sample level was 6db higher than the observed internal crosstalk level on that
band. This may not be practical on the higher bands due to the higher
crosstalk at higher frequencies.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:9.5pt;font-family:"Arial","sans-serif"'>Well,
I stand by what I wrote. Every radio/amp/coupler/frequency combination will be
different. Each person is going to have to adjust their setup to match their
equipment. I wanted to lay out the PROCESS by which maximum performance can be
achieved. I didn't address the issues of filter selection or other parameters.
Someone who knows those effects better than I should do that. Regardless, what
I posted is correct and useful.<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:9.5pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-size:9.5pt;font-family:"Arial","sans-serif"'>As
a final point, no one seems to be addressing the issue of reducing stray
coupling inside the ANAN 100. That alone would provide the biggest improvement
and make all the other settings less critical.</span><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>-- <o:p></o:p></p>
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<p class=MsoNormal>Brian Lloyd, WB6RQN/J79BPL <span
style='border:solid windowtext 1.0pt;padding:0cm'><img border=0 width=100
height=100 id="_x0000_i1025" src="cid:~WRD000.jpg"
alt="Das Bild wurde vom Absender entfernt."></span><br>
706 Flightline Drive<br>
Spring Branch, TX 78070<br>
<a href="mailto:brian@lloyd.com" target="_blank">brian@lloyd.com</a><br>
+1.916.877.5067<o:p></o:p></p>
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