az peak for building 2

23jan13

The azimuth position to maximize the dome signal building 2 was measured on 23jan13.  The setup was:
• Mount a 1400 Mhz helical antenna from john harmon's old office on the 4th floor of building 2.
• Open the window point the antenna perpendicular to the vertical wall.
• transmit -33dbm from the synthesizer (into the 6 foot cable and then antenna).
• Setup lbw in the dome with linear polarizations:
• Set the interim correlator to 1 Mhz bw, 1024 channels, 9 level sampling
• Move the azimuth between 290 and 360 degrees while taking data for each of the following zenith angles:
• za=19 deg
• za=17 deg
• za = 15 deg
The plots show the signal strength vs az,za  for the spectral channel containing the tone (after hanning smoothing) (.ps) (.pdf)
• Top frame: za=19 deg
• Middle frame: za=17deg
• bottom frame: za=15 deg
• the * show the data samples
• The dashed colored lines show the azimth for the peaks at za= 19,17, and 15 degrees.
• The vertical scale is linear. 1 = the power in a single channel.

Summary:

• The peak azimuths are:
• za=19, az=329.19
• za=17, az=337.47
• za=15, az=320.19
• The peak strength drops from 2000 for za=19 to 500 for za=15
• The peak strength at a single za can change by 33 db in 3 degrees of azimuth

processing: x101/130123/bld2sine.pro

home_~phil