| ATCA | IRAM | OVRO | NMA | BIMA | ALMA | ALMA prototype | ||
| Location | - | Australia | France | US | Japan | US | Chile | VLA site |
| Altitude | [m] | 200 | 2560 | 1216 | ? | 1043 | 5000 | ? |
| Operation | - | 2002 | current | current | current | current | 2005? | 2002 |
| Antenna Parameters: | - | - | - | - | - | - | - | - |
| Number of antennae | n | 5(6) | 5(6) | 6 | 6 | 10 | 64 | 2 |
| Number of baselines | N | 10(15) | 10(15) | 15 | 15 | 45 | 2016 | 1 |
| Antenna diameter | D [m] | 22 | 15 | 10.4 | 10 | 6.1 | 12 | 12 |
| Mapping speed | N*D^2 | 2.1(3.2) | 1.0(1.5) | 0.7 | 0.7 | 0.65? | ? | |
| Antenna area | A [m^2] | 1900(2280) | 885(1060) | 510 | 470 | 292 | 7236 | |
| Single dish equivalent | [m] | 50(54) | 34(37) | 26 | 25 | 19 | 96 | |
| Surface accuracy | [mm] | <0.150 | 0.060 | 0.035 | <0.030 | 0.021 | ||
| Surface efficiency | n_sf | 0.60-0.75 | 0.92-0.95 | 0.98 | ? | 0.99? | ||
| Pointing accuracy | [arcsec] | ? | ? | 4 | 5 | 5 | ? | ? |
| Longest baseline | [km] | 3(6) | 0.41 | 0.24 | 0.36 | 2 | 10 | |
| Shortest baseline | [m] | 30 | 24 | 25? | 15 | 7.2 | ? | |
| Receiver Parameters: | - | - | - | - | - | - | - | - |
| Frequency range | [GHz] | 85-115 16-26 | 81-115 210-250 | 80-116+ | 80-115+ | 70-116 210-270 | 70-900 | |
| Dual freq. observing | - | partly | yes | yes | fast switching | yes | ||
| Receiver temperature | T_rec [K] | ? | 30-50 40-60 | 50-150? | 40-70 | 50-150 | ||
| System temperature | T_sys [K] | 180 | ? | 200-800 | 150-300 | 200-600 | ||
| Polarization | - | 2 | 1 | 1 | 1 | 1 | ||
| Correlator Parameters: | - | - | - | - | - | - | - | - |
| Bandwidth | B [MHz] | 4 x 128 (2IF,2pol) | 310 (6 units) | 4 x 128 | 1000 | 800 hybrid |
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| Number of channels | - | ? | 64-256 | ? | ? | 2048 | ||
| Performance @ 90 GHz | - | - | - | - | - | - | - | - |
| Antenna sensitivity | [Jy/K] | 16 | 25 | ? | ? | ? 0 | ||
| Aperture efficiency | n_a | 0.45 | 0.6 | >0.70 | 0.57 | 0.7 | ||
| Efficiency | - | 0.88*? | <0.85 | ? | ? | ? | ||
| System Temperature | T_sys | 230 | 150? | ? | ? | 250 | ||
| Sensitivity | mJy | 0.55(0.45) | 0.3(?) | ? | ? | ? |