Minutes
1. Shifan presented latest version of "A radio interferometric couplings modeling and analysis method for 21 cm cosmology" (attached below). Send comments to Shifan.
2. Jixia gave an update on the status of hardware at the Tianlai site. Note that the calibration noise source (CNS) has a bandpass filter that is chosen to match the bandpass of the receivers. If we retune the dish array receivers to lower redshift, we will have to retune the calibrator as well. But this will prevent phase calibration of the cylinder array. So the plan to postpone the retuning until measurements with the cylinder at 700-800 MHz are completed.
3. Peter presented latest plans to address reviewer's comments on “The Effects of the Local Environment on a Compact Radio Interferometer I: Cross-coupling in the Tianlai Dish Pathfinder Array" (attached below). Some discussion with Fengquan about the VNA measurements. Fengquan hopes to do the requested measurement of the the entire system with terminations at each LNA, to rule out possible coupling between receivers that do not involve the antennas themselves. Albert agreed to answer a comment about the nightly mean removal.