General Statistical Information on Antenna

Coordinates

Latitude (geodetic1)	18° 20' 36.6" North
Longitude (geodetic1)	66° 45' 11.1" West
Latitude (astronomical)	18° 21' 13.7" North
Longitude (astronomical)	66° 45' 18.8" West
Declination range	-01:24:00 through +38:00:00
Azimuth Slew Rate	0.4 deg/s, 1440 deg/hour
Elevation Slew Rate	0.04 deg/s, 144.0 deg/hour
Zenith angle range	1.06 - 19.69 degrees
Magnetic Dip	50°
Magnetic declination	8° 30' West
Height of reflector center of curvature above MSL	1630 ft (497 m)

1Earth Ellipsoid "Mercury 1960", with semimajor axis 6378166 m and inverse flattening 298.3

Reflector and Structure

Type	Fixed reflector, movable feeds
Diameter of reflector	1000 ft (304.8 m)
Area of aperture	18 acres (73,000 sqare m)
Shape of surface	70° spherical cap
Radius of curvature	870 ft (265 m)
Surface accuracy	2.2 mm rms

Typical Gregorian Performance

-	Effective Aperture			Forward Gain
Freq. (MHZ)	ZA = 15°	ZA = 20°		ZA = 15°	ZA = 20°
327	10.5 K/Jy	9 K/Jy		55.5 dB	53.1 dB
430	11 K/Jy	10 K/Jy		55.5 dB	55.5 dB
610	11 K/Jy	10 K/Jy		60.9 dB
1400	11 K/Jy	10 K/Jy		68.3 dB	67.2 dB
2380	10 K/Jy	8 K/Jy		72.4 dB	71.2 dB
3300	8 K/Jy	6 K/Jy
5000	7 K/Jy	5.5 K/Jy		78.3 dB	76.8 dB
7000	4.5 K/Jy	4 K/Jy
8500	4 K/Jy	3 K/Jy

Noise Contributions ( excluding receiver noise )
-	ZA = 15°	ZA = 20°
Spillover	4 K	6 K
Blockage	4 K	4 K
Atmosphere	3 K	3 K
Cosmic Background	3 K	3 K
Total	14 K	16 K

Peak Sidelobe Level ( with blockage )
-	ZA = 15°	ZA = 20°
250 MHz	- 12.2 dB	- 11.2 dB
500 MHz	- 13.5 dB	- 12.5 dB
1000 MHz	- 15.1 dB	- 14.2 dB
5000 MHz	- 16.0 dB	- 15.0 dB

-		ZA = 15°	ZA = 20°
Cross - Polarization	- 28 dB	------	------
Beam Squint	Circular Pol.	0.01 HPBW	------
Feed Cluster Size	430 MHz	1	------
( see discussion )	1400 MHz	3 ( or 7, without 1 dB gain reduction )
-	5000 MHz	7	------

1 One Kelvin/Jansky (K/Jy) corresponds to 2761 m² effective aperture.