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).

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 ChannelsOutput 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
 
information_for_astronomers/user_guide/8k-polar.txt · Last modified: 2014/02/11 16:16 by akraus     Back to top