A conservative estimate of the rms pointing accuracy of the 45-ft antenna is measured to be 30"/cosE in azimuth, and 40" in elevation, similar to the conclusions of a study by Fomalont in 1973, who found 30" and 50". Nighttime measurements during clear weather achieve somewhat better accuracy: about 20"/cosE in azimuth and 26" in elevation. The antenna efficiency appears to fall off slightly at elevations below 30°. At 10° elevation, the efficiency drops to about 90% of the maximum. The 1973 memo on 45-ft pointing by Fomalont is reproduced in Appendix A.
NRAO Electronics Division Report
- Pub Date: