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antenna.html
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......@@ -256,18 +256,18 @@ Additionally, a number of high-energy receivers are being planned for the SRT. T
<p>Different RF filters are available for the LP-band receiver. Although it is a coaxial receiver package, the control system sees it as a group of three different receivers, each one with its own code:</p>
<p>For the PPP receiver (P-band), there is one available filter (with code L2XX for linear or C2XX for circular): 300–360 MHz (which is needed to exclude RFI at higher frequencies).</p>
<p>For the LLP (L-band) configuration, the following filters are available for linear or circular polarizations:</p>
<blockquote>
<div><p>XXL1 (for linear) or XXC1 (for circular): all band, 1300–1800 MHz (no filter) (not recommended)</p>
<p>XXL2 (for linear) or XXC2 (for circular): 1320–1780 MHz</p>
<p>XXL3 (for linear) or XXC3 (for circular): 1350–1450 MHz (VLBI band)</p>
<p>XXL4 (for linear) or XXC4 (for circular): 1300–1800 MHz (band-pass)</p>
<p>XXL5 (for linear) or XXC5 (for circular): 1625–1715 MHz (VLBI band)</p>
</div></blockquote>
<ul class="simple">
<li>XXL1 (for linear) or XXC1 (for circular): all band, 1300–1800 MHz (no filter) (not recommended)</li>
<li>XXL2 (for linear) or XXC2 (for circular): 1320–1780 MHz</li>
<li>XXL3 (for linear) or XXC3 (for circular): 1350–1450 MHz (VLBI band)</li>
<li>XXL4 (for linear) or XXC4 (for circular): 1300–1800 MHz (band-pass)</li>
<li>XXL5 (for linear) or XXC5 (for circular): 1625–1715 MHz (VLBI band)</li>
</ul>
<p>For simultaneous LP observations, all combinations of the above configurations are allowed.</p>
<ul class="simple">
<li>Additional filters</li>
</ul>
<p>Additional filters (128 MHz, 256 MHz and 460 MHz) are available at L-band at the level of the backends (especially for the DFB, ROACH1 and SARDARA backends).</p>
<p>Additional filters (115 MHz, 230 MHz and 460 MHz) are available at L-band for the DFB, ROACH1, DBBC and SARDARA backends. The L-band (1300 - 1800 MHz) is downconverted using a local oscillator; therefore the central frequencies of these filters can be tuned to the desired range by tuning the value for the local oscillator.</p>
</div>
</div>
<div class="section" id="backends">
......@@ -276,11 +276,11 @@ Additionally, a number of high-energy receivers are being planned for the SRT. T
<p>These backends are available for the current call for proposals:</p>
<table border="1" class="docutils">
<colgroup>
<col width="15%" />
<col width="9%" />
<col width="19%" />
<col width="20%" />
<col width="15%" />
<col width="16%" />
<col width="7%" />
<col width="18%" />
<col width="21%" />
<col width="16%" />
<col width="22%" />
</colgroup>
<thead valign="bottom">
......@@ -309,14 +309,14 @@ Additionally, a number of high-energy receivers are being planned for the SRT. T
</tr>
<tr class="row-even"><td><strong>SARDARA</strong></td>
<td>C,K</td>
<td>420, 1500(1200)*</td>
<td>420, 1500(1200*)</td>
<td>spectro-polarimeter</td>
<td>down to 5ms</td>
<td>1024 or 16384</td>
</tr>
<tr class="row-odd"><td><strong>SARDARA</strong></td>
<td>L</td>
<td>128,256,460</td>
<td>115,230,460,1500</td>
<td>spectro-polarimeter</td>
<td>down to 5ms</td>
<td>1024 or 16384</td>
......@@ -353,6 +353,7 @@ Additionally, a number of high-energy receivers are being planned for the SRT. T
</tr>
</tbody>
</table>
<p>(1200*) the actual available bandwidth for SARDARA is 1200 MHz.</p>
<div class="section" id="total-power">
<h2>Total Power<a class="headerlink" href="#total-power" title="Permalink to this headline"></a></h2>
<p>The Total Power backend is a single-band, seven-beam backend for continuum observations. Located just below the dish, this backend is formed by 14 voltage-to-frequency converters that digitize the incoming RF signals. Different IF inputs can be selected from three focal points. Different bandwidths (maximum bandwidth: 0.1 - 2.1 GHz) and attenuation levels can be selected.</p>
......@@ -555,7 +556,7 @@ Available configurations consist of:</p>
</ul>
<p>SARDARA’s spectral resolution and sensitivity are defined by its full 1500 MHz bandwidth. However only 1200 MHz of the full 1500 MHz bandwidth is usable, since the 1200 MHz filter of the Total Power backend’s Focus Selector is being used as input to SARDARA.</p>
<p><strong>in L band:</strong></p>
<p>The full bandwidth for this receiver is 500 MHz (1.3-1.8 GHz). RF filters can be used (XXL4, XXL2 etc.) as well as additional backend filters (128, 256 or 460 MHz).</p>
<p>The full bandwidth for this receiver is 500 MHz (1.3-1.8 GHz). RF filters can be used (XXL4, XXL2 etc.) as well as additional backend filters (115, 230 or 460 MHz).</p>
<p>More detailed information on the SARDARA backend can be found here: <a class="reference external" href="https://www.worldscientific.com/doi/full/10.1142/S2251171718500046">SARDARA</a>.</p>
</div>
</div>
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antenna.rst
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......@@ -133,21 +133,17 @@ For the PPP receiver (P-band), there is one available filter (with code L2XX for
For the LLP (L-band) configuration, the following filters are available for linear or circular polarizations:
XXL1 (for linear) or XXC1 (for circular): all band, 1300--1800 MHz (no filter) (not recommended)
XXL2 (for linear) or XXC2 (for circular): 1320--1780 MHz
XXL3 (for linear) or XXC3 (for circular): 1350--1450 MHz (VLBI band)
XXL4 (for linear) or XXC4 (for circular): 1300--1800 MHz (band-pass)
XXL5 (for linear) or XXC5 (for circular): 1625--1715 MHz (VLBI band)
* XXL1 (for linear) or XXC1 (for circular): all band, 1300--1800 MHz (no filter) (not recommended)
* XXL2 (for linear) or XXC2 (for circular): 1320--1780 MHz
* XXL3 (for linear) or XXC3 (for circular): 1350--1450 MHz (VLBI band)
* XXL4 (for linear) or XXC4 (for circular): 1300--1800 MHz (band-pass)
* XXL5 (for linear) or XXC5 (for circular): 1625--1715 MHz (VLBI band)
For simultaneous LP observations, all combinations of the above configurations are allowed.
* Additional filters
Additional filters (128 MHz, 256 MHz and 460 MHz) are available at L-band at the level of the backends (especially for the DFB, ROACH1 and SARDARA backends).
Additional filters (115 MHz, 230 MHz and 460 MHz) are available at L-band for the DFB, ROACH1, DBBC and SARDARA backends. The L-band (1300 - 1800 MHz) is downconverted using a local oscillator; therefore the central frequencies of these filters can be tuned to the desired range by tuning the value for the local oscillator.
Backends
========
......@@ -156,18 +152,20 @@ The frontend (receiver) outputs are connected to the backend instruments either
These backends are available for the current call for proposals:
=============== ========= ================== =================== =============== =====================
Backend Bands Bandwidth (MHz) Type Sampling time Max frequency bins
=============== ========= ================== =================== =============== =====================
**Total Power** C,K 250,680,1200,2000 analog/total power 1-1000 ms 1
**XARCOS** C,K 0.5,2.0,7.8,62.5 spectro-polarimeter 10s 2048
**SARDARA** C,K 420, 1500(1200)* spectro-polarimeter down to 5ms 1024 or 16384
**SARDARA** L 128,256,460 spectro-polarimeter down to 5ms 1024 or 16384
**DFB3** L,C,K 256,512,1024 pulsars 100 microsec 8192, pulsars: 2048
=============== ======= ================= ==================== =============== =====================
Backend Bands Bandwidth (MHz) Type Sampling time Max frequency bins
=============== ======= ================= ==================== =============== =====================
**Total Power** C,K 250,680,1200,2000 analog/total power 1-1000 ms 1
**XARCOS** C,K 0.5,2.0,7.8,62.5 spectro-polarimeter 10s 2048
**SARDARA** C,K 420, 1500(1200*) spectro-polarimeter down to 5ms 1024 or 16384
**SARDARA** L 115,230,460,1500 spectro-polarimeter down to 5ms 1024 or 16384
**DFB3** L,C,K 256,512,1024 pulsars 100 microsec 8192, pulsars: 2048
**ROACH1** P,L,C,K 128 baseband recorder - (varies)
**DBBC** P,L,C,K 512 VLBI - -
=============== ========= ================== =================== =============== =====================
=============== ======= ================= ==================== =============== =====================
(1200*) the actual available bandwidth for SARDARA is 1200 MHz.
Total Power
-----------
......@@ -284,7 +282,7 @@ SARDARA's spectral resolution and sensitivity are defined by its full 1500 MHz b
**in L band:**
The full bandwidth for this receiver is 500 MHz (1.3-1.8 GHz). RF filters can be used (XXL4, XXL2 etc.) as well as additional backend filters (128, 256 or 460 MHz).
The full bandwidth for this receiver is 500 MHz (1.3-1.8 GHz). RF filters can be used (XXL4, XXL2 etc.) as well as additional backend filters (115, 230 or 460 MHz).
More detailed information on the SARDARA backend can be found here: `SARDARA <https://www.worldscientific.com/doi/full/10.1142/S2251171718500046>`_.
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