| C | Gregorian C(3.95 to 5.85 GHz) |
| K | Gregorian K(18.0 to 26.5 GHz) |
| B | Gregorian Ka B(26.0 to 40.0 GHz) |
| U | Gregorian Ku U(12.4 to 15.4 GHz) |
| L | Gregorian L(1.15 to 1.73 GHz) |
| Q | Gregorian Q(40.0 to 50.0 GHz) |
| S | Gregorian S(1.73 to 2.6 GHz) |
| X | Gregorian X(8.2 to 10.0 GHz) |
| 3 | Prime Focus 1-1 3(0.29 to 0.395 GHz) |
| 4 | Prime Focus 1-2 4(0.385 to 0.520 GHz) |
| 6 | Prime Focus 1-3 6(0.51 to 0.69 GHz) |
| 8 | Prime Focus 1-4 8(0.68 to 0.92 GHz) |
| A | Prime Focus 2 A(0.91 to 1.23 GHz) |
| B | Berkley Caltech Pulsar Machine |
| R | Caltech-Green Bank-Swinbourne Recorder 2 |
| C | Coherent Green Bank-Berkley Pulsar Processor |
| D | GBT Digital Continuum Receiver |
| S | GBT Spectrometer |
| 2 | S2 recorder |
| P | Spectral Processor |
| G | Spectrometer Pulsar Spigot Mode |
| O | User supplied or new backend |
| V | VLBA recorder and DAR |
| A | Astronomy |
| M | Maintenance |
| T | Tests |
| D | Shutdown |
| K | Calibration |
| C | Commissioning |
| N | Notscheduled |
| S | Setup |