Available Receivers

The properties of the currently available receivers are given in Table 3. The columns of the table give the receiver name, frequency range, the typical System Temperature (T$_{\rm sys}$), Gain, System Equivalent Flux Density (SEFD) and Half Power Beamwidth (HPBW) for zenith angles below 15$^{\circ}$ (as measured by Arecibo staff.) For more extensive performance descriptions, including the detailed changes of T$_{\rm sys}$, Gain and SEFD with zenith angle (and possibly azimuth), consult http://www.naic.edu/~astro/RXstatus/ (and there click on the link for the receiver of interest.)

As well as the single-pixel receivers which cover essentially the complete range 1.1 - 10 GHz and two bands below 1 GHz, the Gregorian dome contains the Arecibo L-band Feed Array (ALFA). This was installed in April 2004. ALFA is a seven-feed survey instrument, covering a band of 1225-1525 MHz. It offers excellent performance, with rapid sky coverage. Full details of the ALFA observing system, its performance, and the latest ALFA news are to be found via, http://www.naic.edu/alfa/


Table: Available Receivers
Receiver Freq Range System Temp$^{a}$ Gain$^{a}$ SEFD$^{a, b}$ HPBW$^{a, f}$
Designation (GHz) (K) K/Jy Jy (at zenith) Az $\times$ ZA (Arcmin)
Carriage House
430ch$^{g}$ 0.425 - 0.435 70 - 120 10 - 20 3.5 - 10 10 $\times$ 12
Gregorian Dome: Single-Pixel Receivers
327 0.312 - 0.342 90 + T$_{\rm {sky}}$ 10.5 11 14 $\times$ 15
430 0.425 - 0.435 35 + T$_{\rm {sky}}$ 11 5 10 $\times$ 12
lbw 1.120 - 1.730 25 10.5 2.4 3.1 $\times$ 3.5
sbw 1.800 - 3.100 32 9.5 3.4 1.8 $\times$ 2.0
sbn 2.240 - 2.340 25 10 2.5 1.8 $\times$ 2.0
  2.330 - 2.430 25 10 2.5 1.8 $\times$ 2.0
sbh 3.000 - 4.000 29 8.8 3.3 1.35 $\times$ 1.5
cb 3.850 - 6.050 31 8 3.9$^{c}$ 0.9 $\times$ 1.0
cbw$^{d}$ 4.000 - 8.000 - - - -
xb 8.0 - 10.0 33 4.5 7.5$^{e}$ 0.5 $\times$ 0.6
Gregorian Dome: Feed Array
ALFA          
Center Pix 1.225 - 1.525 30 11 2.8 3.3 $\times$ 3.7
Outer Pixs 1.225 - 1.525 30 8.5 3.5 3.3 $\times$ 3.7
Receiver Notes
$a$) T$_{sys}$, Gain and SEFD all vary with zenith angle (and to a lesser degree with azimuth). T$_{sys}$ and SEFD increase with zenith angle, while Gain decreases. The HPBW in ZA increases with zenith angle.
$b$) SEFD, the System Equivalent Flux Density (= T$_{sys}$/G) is the system temperature expressed in Jy/beam.
$c$) At 5 GHz.
$d$) The C-Band Wide receiver was installed in the Gregorian Dome in July 2017, and is currently (October 30, 2017) being commissioned. When the receiver is ready for observations, performance figures across the band will be added to this table.
$e$) At 9 GHz.
$f$) HPBW is the Half-Power Beam-Width.
$g$) The 430-MHz CH line feed was severely damaged by the passage of Hurricane Maria in Sept. 2017. As of today (October 30, 2017) this feed is not available for observations. However, planning for its repair and recommissioning is underway.

Robert Minchin 2017-10-30