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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’ve been contemplating the design of a ‘low end’
receiver/transmitter board to plug into the ATLAS back plane. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This definitely would not compete with the cutting edge
technology destined for CASMIR/HORTON/MERCURY but would leverage existing work
done in the SDR community by utilizing a receiver similar to a SoftRock
6.0 receiver or possibly one of the YU1LM designs. The transmitter would be
similar to the one YU1LM or others have proposed and built. The goal is one of
providing a relatively low cost alternative RX/TX choice for the HPSDR
architecture.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> I am thinking of including either a DDS (similar to
DDS-60) or PLL synthesizer with an onboard PIC processor to drive a LCD
display and knob encoder. There could be provisions to allow serial control of
the synthesizer via I2C or similar from Sasquatch if it were present in lieu of
the knob encoder. The synthesizer would either have it’s own reference oscillator
onboard or have the option to utilize an external 10MHz clock coming from
another HPSDR board if desired.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The IQ output of this proposed receiver would feed into
JANUS. The PWM quadrature audio from JANUS would also be used to drive the
proposed transmitter.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I think the TX, RX, synthesizer and PIC processor will all
fit on a single 100mmx120mm form factor HPSDR board. A minimal system using
this board would consist of this board, a JANUS and a OZY.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This is still in the conceptual stage. Many details to be worked
out yet. Comments and feature wishlists will certainly be considered.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m planning on calling this board the <st1:City
w:st="on">Phoenix</st1:City> after the mythological <st1:City w:st="on"><st1:place
w:st="on">Phoenix</st1:place></st1:City> bird as it will be a rebirth of
several existing SDR designs into a new HPSDR module.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>After a bit more contemplation I’ll have some initial
block diagrams ready in a couple days.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>-Ray WB6TPU<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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