====== 8-Bank Polarimeter ======

There are two 8-bank polarimeters available at Effelsberg; one for the 18/21cm-receiver 
(alternatively, it could be connected to the 21cm-7Beam system, both are prime focus systems), 
the other for the 11cm-receiver (located in the secondary focus). These can be used to split 
the full IF band into eight subbands and investigate the polarization properties of the signal 
seperately (eg., for Rotation Measure studies).

{{8k-Pola.png?784}}

Besides the eight subbands, there is also a polarimeter for a larger bandwidth. As each 
polarimeter has four outputs, there are 36 channels in total. 

For the data analysis the standard procedures can be applied – they just have to be repeated 
9 times!

The table below summarizes the frequency distribution and channel assignment of the subbands 
for the 18/21cm- and the 11cm-receivers.


^18/21cm receiver                ^       ^        ^11cm receiver^
|Center frequency 1400/1666 MHz |       |        |Center frequency 2639.5 MHz|
|Frequency of sub band          |Channels|Output |Frequency of sub band|
|1386 ± 2 MHz / 1652 ± 2 MHz    |1       |TP A   |2604.5 ± 5 MHz   |
|                               |2       |TP B   |                 |
|                               |3       |cos A/B|                 |
|                               |4       |sin A/B|                 |
|1390 ± 2 MHz / 1656 ± 2 MHz    |5-8     |       |2614.5 ± 5 MHz   |
|1394 ± 2 MHz / 1660 ± 2 MHz    |9-12    |       |2624.5 ± 5 MHz   |
|1398 ± 2 MHz / 1664 ± 2 MHz    |13-16   |       |2634.5 ± 5 MHz   |
|1402 ± 2 MHz / 1668 ± 2 MHz    |17-20   |       |2644.5 ± 5 MHz   |
|1406 ± 2 MHz / 1672 ± 2 MHz     |21-24   |       |2654.5 ± 5 MHz   |
|1410 ± 2 MHz / 1676 ± 2 MHz     |25-28   |       |2664.5 ± 5 MHz   |
|1414 ± 2 MHz / 1680 ± 2 MHz     |29-32   |       |2674.5 ± 5 MHz   |
|  //Full band (beware of RFI!)//|       |       |   //Full band//     |
|1400 ± 50 MHz /1666  ± 50 MHz   |33-36    |       |2639.5 ± 40 MHz   |