[evlatests] Ant 13 K-band attenuators reset

[Walter Brisken]

I commited new attenuator values to the parameter database today.  All 4 
IFs wanted 9 dB less attenuation, in fairly good agreement with the 10dB 
extra dB added in hardware as per below.

-Walter


> We did notice that the IF power at the input to the LO/IF Rack was about -20 
> dBm on cold sky, which seems a bit high for the T304 downconverter. We 
> suspect that the RF amp on the T304 is likely being saturated. We added 10 dB 
> pads on the Rx outputs (i.e., before the UX Converter) to help ensure that 
> neither the T303 or T304 were running into compression. However, we might 
> need to add more. Perhaps someone in the Systems Group might want to check on 
> what the optimum power levels should be.