Node s3-lg1 is the third sector of ​Large Node 1, located on the roof of the Mudd Building at Columbia University. Unlike sectors 1 and 2, sector 3's ​antenna is pointed in a southerly direction overlooking the Columbia Morningside Heights campus.

Coverage

​Coverage measurements were performed around the campus area in August 2020. In total, 201 measurements were taken in a roughly 5m-spaced grid in the campus area. The measurement results are presented below.

Figure 1: Coverage measurement results for s3-lg1.

These measurements demonstrate an RSSI of around -85 dBm at a 300 m straight-line distance, even in the presence of multiple buildings blocking line of sight. As would be expected, the locations close to the node experience a high RSSI an hence high SNR.

Of particular note are the measurements in the southeastern area. This area is not only shadowed by several buildings, but is also outside of the beam width of s3-lg1's antenna. This demonstrates that s3-lg1 provides coverage for a significant area of the Columbia campus, making it useful for experiments undertaken in this area.

To-Do

Measurements on Broadway (the street to the east of Figure 1)

Measurements further to the south towards the Butler Library.