[Pafgbt] GBT PAF system assumptions

[Roger Norrod]

Bob,

The PAF technology is similar to our other receivers that use HFETs, and 
  the most sensitive stuff will be in the PF FEB.  The one factor we 
don't usually worry about too much on single-dishes is the PAF is 
sensitive to phase delay stability until the signals hit the digitizers. 
  That's one reason Rick includes an injected calibration signal.

Bolometers are probably several orders of magnitude more sensitive to 
vibrations.

Roger


Bob Anderson wrote:
> 1.  How sensitive do you expect the components to be to room temperature 
> fluctuations?  Roger has seen effects in another receiver, even though 
> the receiver room HVAC performance is far,far better than 
> specifications. 2.  Will the front end elements be sensitive to 
> vibrations?  Mustang's sensitivity to  vibrations may be unique to their 
> use of bolometers, but now's the time to make provisions for dampening 
> if this will be a problem.