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information_for_astronomers:user_guide:signalpathsetup
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information_for_astronomers:user_guide:signalpathsetup [2014/11/21 11:10] bwinkel |
information_for_astronomers:user_guide:signalpathsetup [2016/03/15 13:49] akraus |
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| ===== Signal paths to the spectroscopic, VLBI, and pulsar backends ===== | ===== Signal paths to the spectroscopic, VLBI, and pulsar backends ===== | ||
| - | There are several IF chains going to the Faraday room (where the backends live), most importantly the VLBA and narrow-band (SB) IF. Furthermore, the 21-cm 7-feed system has its own IF; and some receivers provide a 2+ GHz IF over optical fibers. All IFs are usually used with different bandwidth setups and need different attenuation to bring the power to a level which is appropriate for the backend ADCs. This is done using the so-called **MultiFiBa**. | + | There are several IF chains going to the Faraday room (where the backends live), most importantly the VLBA and narrow-band (SB) IF. Furthermore, the 21-cm 7-feed system has its own IF; and some receivers provide a 2+ GHz IF over optical fibers. All IFs are usually used with different bandwidth setups and need different attenuation to bring the power to a level which is appropriate for the backend ADCs. This is done using the so-called **MultiFiBa**. |
| The various IFs coming from the receivers are fed into the 16-channel MultiFiBa, which allows to apply several internal bandpass filters and attenuation. Channels 1-7 and 9-15 is almost exclusively used for the 21-cm 7-Beam system. All other receivers are attached to channels 8+16. For each channel the **mode** can be changed with the command | The various IFs coming from the receivers are fed into the 16-channel MultiFiBa, which allows to apply several internal bandpass filters and attenuation. Channels 1-7 and 9-15 is almost exclusively used for the 21-cm 7-Beam system. All other receivers are attached to channels 8+16. For each channel the **mode** can be changed with the command | ||
information_for_astronomers/user_guide/signalpathsetup.txt ยท Last modified: 2017/01/25 20:24 by akraus
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