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ira_start.html
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170 lines (170 loc) · 6.31 KB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
<TITLE></TITLE>
<META NAME="GENERATOR" CONTENT="OpenOffice.org 3.3 (Unix)">
<META NAME="AUTHOR" CONTENT="Marcus Leech">
<META NAME="CREATED" CONTENT="20090316;11131100">
<META NAME="CHANGEDBY" CONTENT="Marcus Leech">
<META NAME="CHANGED" CONTENT="20110608;21135800">
<META NAME="CHANGEDBY" CONTENT="Marcus Leech">
<META NAME="CHANGEDBY" CONTENT="Marcus Leech">
<META NAME="CHANGEDBY" CONTENT="Marcus Leech">
<META NAME="CHANGEDBY" CONTENT="Marcus Leech">
<META NAME="CHANGEDBY" CONTENT="Marcus Leech">
<STYLE TYPE="text/css">
<!--
@page { margin: 0.79in }
H1 { margin-bottom: 0.08in }
H1.western { font-family: "Liberation Sans", sans-serif; font-size: 16pt }
H1.cjk { font-family: "DejaVu LGC Sans"; font-size: 16pt }
H1.ctl { font-family: "DejaVu LGC Sans"; font-size: 16pt }
P { margin-bottom: 0.08in }
-->
</STYLE>
</HEAD>
<BODY LANG="en-US" DIR="LTR">
<H1 CLASS="western">The IRA Starter Window</H1>
<P>The IRA Starter window is used to set parameters for the Gnu Radio
receiver subsystem, then start the main IRA application.</P>
<P><IMG SRC="IRA_Start.png" NAME="graphics1" ALIGN=LEFT WIDTH=516 HEIGHT=309 BORDER=0><BR CLEAR=LEFT><BR><BR>
</P>
<P><BR><BR>
</P>
<H1 CLASS="western">Bandwidth</H1>
<P>This control is used to set the desired observing bandwidth (and
thus, the underlying sampling rate) for the receiver subsystem.</P>
<P>The choices for a USRP1 are:</P>
<P><BR><BR>
</P>
<UL>
<LI><P>250KHz</P>
<LI><P>500KHz</P>
<LI><P>1MHz</P>
<LI><P>2MHz</P>
<LI><P>3.2Mhz</P>
<LI><P>4MHz</P>
<LI><P>6.4MHz</P>
<LI><P>8MHz</P>
<LI><P>16MHz</P>
</UL>
<P>The choices for a USRP2/N2XX are:</P>
<UL>
<LI><P>250KHz</P>
<LI><P>500Khz</P>
<LI><P>1Mhz</P>
<LI><P>2MHz</P>
<LI><P>2.5Mhz</P>
<LI><P>5MHz</P>
<LI><P>10MHz</P>
<LI><P>16.67MHz</P>
<LI><P>25MHz</P>
</UL>
<P>You should pick a bandwidth that is compatible both with your
observing regime, and the compute power available to you. For
example, a dual-CPU Pentium D 925 system running at 3.2GHz can
observe a single channel at 4 to 5MHz bandwidth, with only occasional
buffer overruns from Gnu Radio.</P>
<P>A more modern, multi-core system running at 3.5GHz can handle a
10MHz to 25MHz stream.</P>
<H1 CLASS="western">Longitude</H1>
<P>This input area allows you to enter your local longitude, which is
required in calculating your local mean sidereal time (LMST). Use
decimal format, with negative values used to indicate longitudes that
are WEST of the prime meridian. For example, -63.500 is 63 degrees,
30 minutes WEST longitude, while 63.50 is 63 degrees, 30 minutes EAST
longitude. Remember to press <B>ENTER</B> to have the entered
longitude take effect.</P>
<P STYLE="margin-top: 0.17in; margin-bottom: 0.2in; page-break-after: avoid">
<FONT FACE="Albany, sans-serif"><FONT SIZE=4><B>RA MODE</B></FONT></FONT></P>
<P>This choice control sets the mode used to determine RA (Right
Ascension) during an observation run with IRA. The choices are:</P>
<UL>
<LI><P>manual</P>
<UL>
<UL>
<LI><P>RA is input manually in the RA input area of the IRA
control panel</P>
</UL>
</UL>
<LI><P>transit</P>
<UL>
<UL>
<LI><P>The RA is set dynamically to the current LMST—which is
useful for instruments set up in meridian transit mode, in which
the azimuth axis is fixed on a line that runs exactly NORTH-SOUTH
through the axis of the dish, and only the declination (elevation)
axis is movable.</P>
</UL>
</UL>
<LI><P>external</P>
<UL>
<UL>
<LI><P>This mode allows IRA to get RA (Right Ascension)
information from an external file. When this choice is selected, a
file browser will pop-up, to allow you to select a file from which
RA information is determined dynamically. While operating in this
mode, IRA will inspect the selected file once per second to
determine current RA information. This allows external tracking
and telescope control software to control the antenna, while
informing the receiver where the antenna is pointed.</P>
</UL>
</UL>
</UL>
<P STYLE="margin-top: 0.17in; margin-bottom: 0.2in; page-break-after: avoid">
<FONT FACE="Albany, sans-serif"><FONT SIZE=4><B>DEC MODE</B></FONT></FONT></P>
<P>This choice control sets the mode used to determine DEC
(Declination) during and observation run with IRA. The choices are:</P>
<UL>
<LI><P>manual</P>
<UL>
<UL>
<LI><P>DEC is input manually in the DEC input area of the IRA
control panel</P>
</UL>
</UL>
<LI><P>external</P>
</UL>
<UL>
<UL>
<UL>
<LI><P>This mode allows IRA to get DEC (Declination) information
from an external file. When this choice is selected, a file
browser will pop-up, to allow you to select a file from which DEC
information is determined dynamically. While operating in this
mode, IRA will inspect the selected file once per second to
determine current DEC information. This allows external tracking
and telescope control software to control the antenna, while
informing the receiver where the antenna is pointed.</P>
</UL>
</UL>
</UL>
<P><BR><BR>
</P>
<H1 CLASS="western">License Key</H1>
<P>This input area is used to enter your license key. If you don't
have a license key, the software will automatically expire
approximately 30 days after you receive it. If you don't have a
license key, enter the word “none” in this area. Remember to
press <B>ENTER</B> to have the entered license key data take effect.</P>
<P STYLE="margin-top: 0.17in; margin-bottom: 0.2in; page-break-after: avoid">
<FONT FACE="Albany, sans-serif"><FONT SIZE=4><B>START RA RECEIVER</B></FONT></FONT></P>
<P>This button control causes the IRA main control panel to start,
and this starter panel to be closed. The IRA control panel will use
the parameters provided in the startup panel.</P>
<P><BR><BR>
</P>
<P STYLE="margin-top: 0.17in; margin-bottom: 0.2in; page-break-after: avoid">
<FONT FACE="Albany, sans-serif"><FONT SIZE=4><B>EXIT</B></FONT></FONT></P>
<P STYLE="font-weight: normal">This button control allows you to exit
the IRA starter, without causing the IRA main control panel to start.
This is useful for changing stored settings, without starting the IRA
main control panel.</P>
<P><BR><BR>
</P>
<H1 CLASS="western">HELP</H1>
<P>This document is displayed in the Firefox browser, when you press
this button.</P>
</BODY>
</HTML>