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information_for_astronomers:user_guide:xffts
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information_for_astronomers:user_guide:xffts [2012/06/12 11:09] 127.0.0.1 external edit |
information_for_astronomers:user_guide:xffts [2014/11/21 10:56] (current) bwinkel [3. Set the correct MultiFiBa Mode and level the XFFTS] |
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| You may want to have a look at the page about [[information_for_astronomers:user_guide:signalpathsetup|Signal paths to the spectroscopic and pulsar backends]] for background information regarding the MultiFiBa, especially how to choose the correct **MultiFiBa Mode**. The most common MultiFiBa modes are | You may want to have a look at the page about [[information_for_astronomers:user_guide:signalpathsetup|Signal paths to the spectroscopic and pulsar backends]] for background information regarding the MultiFiBa, especially how to choose the correct **MultiFiBa Mode**. The most common MultiFiBa modes are | ||
| - | ^Mode^Setup^ | + | ^Mode^Channels^IF name^IF range^Bandwidth^Attenuation^Comments^ |
| - | | 000 | **XFFTS, 2 GHz bandwidth.**| | + | ^ ^ ^ ^[MHz]^[MHz]^enabled^ ^ |
| - | | 128 | AFFTS 100 MHz bandwidth (almost exclusively used for spectroscopy with the 21-cm 7-feed) | | + | |249|8+16|VLBA IF|700-800|100|yes| | |
| - | | 161 | **XFFTS 100/500 MHz.** AFFTS 300 MHz (exclusively used for pulsar observations with the 21-cm 7-feed)| | + | |185|8+16|VLBA IF|500-1000|500|yes| | |
| - | | 192 | Special mode for using the DFB in polarimetry mode | | + | |128|8+16|Narrowband (SB)|100-200|100|yes| | |
| + | |033|8+16|Optical|0-2500|2500|no|used for UBB/new K-band| | ||
| - | + | {{:information_for_astronomers:user_guide:xfftsgui.png?500|}}\\ | |
| - | {{:information_for_astronomers:xffts_leveling.png?500|}}\\ | + | |
| //Using the xfftsGUI software, it is easy to level the XFFTS and choose correct multiFiBa modes.// | //Using the xfftsGUI software, it is easy to level the XFFTS and choose correct multiFiBa modes.// | ||
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| + | **Note, that the MultiFiBa got a very slow processing unit, so sometimes it may take a while until the requested mode is set.** | ||
| ==== 4. Checking bandpass shapes ==== | ==== 4. Checking bandpass shapes ==== | ||
| - | {{:information_for_astronomers:xffts_100mhz.png?200|}}{{:information_for_astronomers:xffts_500mhz.png?200|}}{{:information_for_astronomers:xffts_2000mhz.png?200|}}\\ | + | {{:information_for_astronomers:user_guide:fiba_249.png?400|}}{{:information_for_astronomers:user_guide:fiba_185.png?400|}}\\ |
| - | //The XFFTS Monitor (on the xffts vnc) should be used to check the bandpass shapes. The figure shows an example of the 1.3-cm receiver for different bandwidth. At least the general shape should be similar for other receivers. Left: 100 MHz. Middle: 500 MHz. Right: 2 GHz.// | + | {{:information_for_astronomers:user_guide:fiba_128.png?400|}}{{:information_for_astronomers:user_guide:fiba_033.png?400|}}\\ |
| + | //The XFFTS Monitor (on the xffts vnc) should be used to check the bandpass shapes. The figures show examples for different bandwidth. At least the general shape should be similar for all receivers. Top left: VLBA-IF 100 MHz, top right: VLBA-IF 500 MHz, lower left: Narrowband-IF (SB) 100 MHz, and lower right: Optical-IF 2 GHz.// | ||
information_for_astronomers/user_guide/xffts.1339492195.txt.gz · Last modified: 2014/11/20 23:38 (external edit)
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