APPENDIX: GBT Prime Focus Receivers

Receiver Center f(GHz) Fsky (GHz) waveLen(cm) FWHM est.Tsys IF1 (GHz)
PF1.1 0.3425 0.290 - 0.395 88 36' 30 K 1.080
PF1.2 0.450 0.385 - 0.520 66 27' 30 K 1.080
PF1.3 0.600 0.510 - 0.690 50 21' 30 K 1.080
PF1.4 0.800 0.680 - 0.920 37 15' 25 K 1.080
PF2 ** 1.070 0.910 - 1.230 28 12' 25 K -----

**Note: PF2 will not be available until mid to late 2001.
Calibration data may be viewed by clicking in the "Receiver" column.

All prime focus receivers have one beam and two polarizations. Either dual linear or dual circular polarizations may be selected.

The first stages of the receivers are cooled FET amplifiers. The feeds for bands 1-3 (0.290-0.690 GHz) are short-backfire dipoles. The feeds for bands 4 and 5 (0.68-0.92 and 0.91-1.23 GHz) are corrugated feed horns with orthomode transducers (OMT) to split the polarizations.

Receiver Changes:

IF conversion:


First LO setting (LO1) :
LO1 range for PF1 :
Filters:
Attenuators:

PF1.1: Prime Focus Receiver 1.1 (290-395 MHz)


Calibration data: preliminary.

PF_1 Feed:342.5 calibration data: preliminary
plot


plot



PF1.2: Prime Focus Receiver 1.2 (385-520 MHz)


Calibration data
No Calibration data available yet.


PF1.3: Receiver 1.3 (510-690 MHz)


Calibration data: preliminary.

PF_1 Feed:600 calibration data: preliminary.
plot


plot



PF1.4: Prime Focus Receiver 1.4 (680-920 MHz)


Calibration data: preliminary..

PF_1 Feed:800 calibration data: preliminary.
plot


Polarization: Y Linear
plot


Polarization: L Circular
plot


Polarization: R Circular
plot


PF2: Prime Focus Receiver 2 (910-1230 MHz)


Calibration data.
No calibration data available.