[evlatests] Input Attenuators Settings at C-band

[Rick Perley]

    Ken has recorded the T304 input attenuator settings utilized when 
observing at C-band.  Below is the list, in dB

Ant.     A        B         C          D
-----------------------------------------
1         12       14         7          7
2           4         4         5          0
3           8         8        11        11
4         12        12       18        20   ***This receiver is HOT!********
5           7        12       11          9
6           8          8         8          6
7           5          6         7          7
8           7          5         4          4
9           6          8         7          8
10         2          1         5          6
11         0          1         2          2    Power level for A is -23 dBm
12         3          0         4          3
13         4          4         1           2
14         5          4         3           1
15         9         11        9          10
16         0           4         4          0
17         0           3         0          4  Power level for A is -21 dBm
18                        out
19         4           2         3           7
20         3           7         6          7
21         3           3         4          7
22         6           5         2          2
23         1           7         3          6
24         0           2         1           1  Power level for A is -23 
dBm -- Icy Cold!!!
25         9           9         9          12
26         1           3         0           3
27        10         11        9           9
28        10           7        4           6
------------------------------------------------

    In all cases, the T304 linearity tests we ran yesterday show that 
with the attenuation values listed above, the T304 module is working 
well within its (wide) optimal zone.  So the system is working well, as 
designed.
    Nevertheless, having the input power be so low that 0 dB input 
attenuation is desired does place us at a (albeit small) risk of 
operating in a non-optimal way.