Project TBASERDN031010:

Goal: investigate X-band receiver 

Setup:

LCP  --> ODM6 --> CM9  --> SF1  --> J1 Bank A, 1
                  CM10 --> SF2  --> J3 Bank B, 1
                  CM11 --> SF3  --> J5 Bank C, 1
                  CM12 --> SF4  --> J7 Bank D, 1
RCP  --> ODM8 --> CM13 --> SF5  --> J2 Bank A, 2
                  CM14 --> SF6  --> J4 Bank B, 2
                  CM15 --> SF7  --> J6 Bank C, 2
                  CM16 --> SF8  --> J8 Bank D, 2


Tune: Bank A,B to 9000MHz; Bank C to 8400 MHz; Bank D to 9600 MHz

Bank  LO2
---- ------
A     12300
B     12300
C     12900
D     11700
-----------

o setup script 

/users/rnorrod/gbtgui

Use file menu: load, save, etc.


Scan   Source    Proc      Mode       Comments
-----  --------  -------- ----------  ----------------------------------------------------
1-2                                   aborted
3      ColdSky   Fixed    ACS 4 bank
4-7    NGC7027   xpeak    DCR         LPCs(0.13, 0.4133)
8-11     "        "        "
12-3     "       xonoff   ACS 4 bank 
14-5     "       xonoff   ACS 4 bank 
16-7     "       xonoff   ACS 4 bank  Add 50 MHz to LO1 (sky 9000-->9050 MHz)
18-19    "        "          "        Add 50 MHz to LO2 (e.g., 12300-->12350 MHz); 
                                      (Set LO1 back; sky 9000 MHz)
20-21    "        "          "        Set all LO2 values to 12300 MHz;
                                      ( i.e., center all banks at sky=9000 MHz)

_________________________________________________________________________________
22-23    "        "          "        Add 6db attenuation before ACS
                                      in channels J1,J3,J6,J8; balance
				      ACS.
CM     Attenuator Setting
9*     3.125 dB             
10*    2.25
11     9.625
12     8.00
13     5.375
14     8.375
15*    3.375
16*    1.750

ODM    Attenuator Setting    TP Voltage
6      21                    ~1V
8      22                    ~1V

(* indicates channels with 6db pad at ACS input connector.)
_________________________________________________________________________________

24-25    "        "          "        Keep pads before ACS; subtract 6db from IF rack 
                                      ODMs 6 and 8; balance ACS

CM     Attenuator Setting    SF#      SF TP Voltage
9*     8.00 dB               1        6.6V
10*    7.875                 2        5.3
11     15.50                 3        1.5
12     13.875                4        1.3
13     10.250                5        2.6
14     14.50                 6        1.3
15*    8.250                 7        5.4
16*    7.375                 8        5.1

ODM    Attenuator Setting    TP Voltage
6      15                    ~3.5V
8      16                    ~3.4V

(* indicates channels with 6db pad at ACS input connector.)
_________________________________________________________________________________


26-27    "        "          "        Same as above except add 3db in IF rack ODMs 6 and 8; 
                                      NO balance of ACS

CM     Attenuator Setting    SF#      SF TP Voltage   ACS DutyCycles
9*     8.00 dB               1        2.5V               1.63
10*    7.875                 2        2.7                1.59
11     15.50                 3        0.8                1.91
12     13.875                4        0.7                1.84
13     10.250                5        1.4                1.64
14     14.50                 6        0.7                1.55
15*    8.250                 7        2.9                1.57
16*    7.375                 8        2.8                1.73

ODM    Attenuator Setting    TP Voltage
6      18                    ~1.8V
8      19                    ~1.8V

(* indicates channels with 6db pad at ACS input connector.)


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