KAT-7 is a radio telescope consisting of seven antennas. The receiver systems are cryogenically cooled to about 70 K ( -203 °C) in order to increase the system's sensitivity. Key performance parameters of KAT-7: Parameter | Value
| Number of Antennas
| 7 | Dish Diameter
| 12m | Baselines | 26 m to 185 m (see here)
| Frequency Range
| 1200 MHz - 1950 MHz
| Instantaneous Bandwidth | 256 MHz
| Polarisation | Linear (H + V) | Tsys | < 35 K across the entire frequency band (~30 K average) for all elevation angles > 30 deg
|
Correlator Modes: Mode | # Bands
| Band Bandwidth
| Channel Bandwidth
| Available | Wideband | 1 | 256 MHz
| 390.625 kHz *
| Yes
| 8k Wideband
| 1 | 256 MHz | 48.8 kHz **
| Yes, but unsupported
| HI Galaxy Clusters
| 1 | 400/16 = 25 MHz
| 25/4096 = 6.1 kHz
| Yes | HI Galaxies / Maser Search | 1 | 400/64 = 6.25 MHz ***
| 6.25/4096 = 1.525879 kHz
| Yes | Maser monitoring | 1 | 400/256 = 1.5625 MHz ***
| 1.5625/4096 = 381.4697 Hz
| Yes |
* The channel bandwidth is obtained by dividing the IF bandwidth (400 MHz) by the total number of channels (1024). Note that only 256 MHz of the IF bandwidth is useable. ** The IF bandwidth (400 MHz) is divided by 8192 channels. *** The useable Band Bandwidth will be slightly less, and will be determined as part of the acceptance testing. Tied-Array Beamformer Modes (boresight beam only for now):
Mode | # Bands
| Band Bandwidth
| Channel Bandwidth
| Available | Wideband | 1 | 256 MHz
| 390.625 kHz
| May 2013
|
Aerial view of KAT-7:
Array location (nominal) | -30:43:17.34, 21:24:38.46, 1038 (latitude - DD:MM:SS.SS, longitude - DD:MM:SS.SS, altitude above MSL - m) | Antenna 1 | 25.095, -9.095, 0.045 (East, North, Up in metres, offset from array location) | Antenna 2 | 90.284, 26.380, -0.226 | Antenna 3 | 3.985, 26.893, 0.000 | Antenna 4 | -21.605, 25.494, 0.019 | Antenna 5 | -38.272, -2.592, 0.391 | Antenna 6 | -61.595, -79.699, 0.702 | Antenna 7 | -87.988, 75.754, 0.138 |
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