The Feed/LNA component consists of log-periodic feed that sends incoming RF signals to the tip-circuit board and then via a pair of transmission lines to the Low-Noise Amplifiers (LNAs) in the cryostat. This unit is mounted at the secondary focus of the antenna with a bracket attached to the primary. The mount has one degree of "in-out" motion to adjust the focus for optimum performance as a function of observing frequency.
- atagetitem cryotemp, cryopower and cryorejtemp.
- Jump start ion pump with Varion vacion. Use this when ion pump driver is over currented. Drive pump with Varion 15s on, 15s off. Approximate time required .5 hr.
- Feed Swap , .75 hr. Replace Pax Box , 1 hr.
When the Rimbox, Paxbox or Feed are replaced use this procedure on ant00. Required time approximately .75 hr. Static Test: