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observing:ragrav
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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observing:ragrav [2016/11/05 02:11] Bryn Emptage [During the observations] |
observing:ragrav [2017/04/14 07:42] Elizabeth Iles |
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| On the 12m, we use the Field System to record the data to the Mark5 and the HMI antenna interface (on the timeyg VNC server) to control the antenna. The RadioAsdtron group provide a file for HMI as well as a VEX file. | On the 12m, we use the Field System to record the data to the Mark5 and the HMI antenna interface (on the timeyg VNC server) to control the antenna. The RadioAsdtron group provide a file for HMI as well as a VEX file. | ||
| + | |||
| + | ==== Signal path modifications ==== | ||
| + | |||
| + | The receiver cross-over switches have been re-wired to allow additional attenuation in the signal path and/or a reduced supply voltage to the X-band RCP LNA. This is to reduce the signal strength entering the DBBC and hopefully improve phase stability. The S-band cross-over with enables a variable power supply for the LNA when crossed and the X-band cross-over switch will put a (manually configurable) variable attenuator into the X-band RCP signal path after the LNA. The Field System commands to set the 4 possible modes are: | ||
| + | <code> | ||
| + | "x-band rcp lna 20V, atten in | ||
| + | rfpic=cross,direct,* | ||
| + | " | ||
| + | "x-band rcp lna 20V, no atten | ||
| + | rfpic=direct,direct,* | ||
| + | " | ||
| + | "x-band rcp lna variable voltage, atten in | ||
| + | rfpic=cross,cross,* | ||
| + | " | ||
| + | "x-band rcp lna variable voltage, no atten | ||
| + | rfpic=direct,cross,* | ||
| + | </code> | ||
| + | |||
| ===== Processing the antenna pointing files ===== | ===== Processing the antenna pointing files ===== | ||
| Line 68: | Line 86: | ||
| lo=lob,7600.00,usb,rcp,off | lo=lob,7600.00,usb,rcp,off | ||
| enddef</code> | enddef</code> | ||
| - | - Lastly, add the checkmk5 procedure: <code>define checkmk5 16273141501x | + | - Lastly, add the checkmk5 procedure: <code>define checkmk5 16273141501x <---(this number is 0000000x at the start) |
| scan_check | scan_check | ||
| !+1s | !+1s | ||
/home/www/auscope/opswiki/data/pages/observing/ragrav.txt · Last modified: 2017/04/22 06:18 by Elizabeth Iles
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