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<DIV>Hi Ulrich,</DIV>
<DIV> </DIV>
<DIV>Please let me add my warm welcome to the group as well. Your work has
been an inspiration to me for many years. As I young ham I built the synthesised
transceiver that you published in Ham Radio in the 70's. I used it as my main
radio for many years and it was my pride an joy. </DIV>
<DIV> </DIV>
<DIV>The are a couple of areas where I would appreciate your comments.
Firstly is the local oscillator for HF use. This is intended to divide
down a GHz VCO. A discussion paper is at </DIV>
<DIV> </DIV>
<DIV>< <SPAN><FONT face=Verdana color=#0000cc size=1><B><A
href="http://www.hamsdr.com/dnld.aspx?id=356">http://www.hamsdr.com/dnld.aspx?id=356</A>
></B></FONT></SPAN></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>One problem already pointed out is that we can't divide the 10MHz GPS
locked reference within the LMX25** to give us an 800kHz reference. We could
either use 400kHz steps and re do the math or double to 20MHz ( or phase lock a
20MHz VCXO to the 10MHz reference) and stay with 800kHz steps.</DIV>
<DIV> </DIV>
<DIV>The second is the design of the preamp for the high speed ADC front end.
Here we are using an LT2208 135MSPS 16 bit A/D converter. My initial tests
indicate a 100dB dynamic range with an overload point of 0dBm. Please see the
discussion on the Wiki at </DIV>
<DIV> </DIV>
<DIV>< <A
href="http://hpsdr.org/wiki/index.php?title=HpsdrWiki:Community_Portal">http://hpsdr.org/wiki/index.php?title=HpsdrWiki:Community_Portal</A> ></DIV>
<DIV> </DIV>
<DIV>under Mercury.</DIV>
<DIV> </DIV>
<DIV>Your comments on the gain/attenuation prior to the ADC would be
appreciated. </DIV>
<DIV> </DIV>
<DIV>73's Phil...VK6APH </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=KA2WEU@aol.com href="mailto:KA2WEU@aol.com">KA2WEU@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=hpsdr@hpsdr.org
href="mailto:hpsdr@hpsdr.org">hpsdr@hpsdr.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, July 08, 2006 10:25
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [hpsdr] Software Radio, Mixers
and oscillators</DIV>
<DIV><BR></DIV>***** High Performance Software Defined Radio Discussion List
*****<BR><BR>
<P>
<HR>
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<DIV><BR>Hi guys</DIV>
<DIV> </DIV>
<DIV>let me know if I can help with mixers or oscillators </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><A
href="http://synergymwave.com/default.asp">http://synergymwave.com/default.asp</A></DIV>
<DIV> </DIV>
<DIV>Ulrich L. Rohde, N1UL</DIV></FONT>
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