1cm (27-38 GHz, Primary Focus) Receiver


Receiver Data

TypeHEMT, cooled
Receiver Noise Temperature10 - 40 K
Frequency Range27 - 38.7 GHz
Bandwidth RF-Filterssee below
CalibrationNoise Diode
FeedPrimary Focus Horn
1. IF2 - 4 GHz (Broadband)
1. OscillatorMultiplier (24*ULO1) 1.22 - 1.488 GHz
2. IF500 - 1000 MHz
2. OscillatorULO2 (x4) 937.5 MHz

Block Diagram

Receiver Noise Temperature



This system is equipped with 3 RF-Filters to suppress mirror frequency reception. During observation, the filter and ULO settings have to be selected according to the observation frequency (see block diagram). In March 2007 the LNA was replaced by an InP-HEMT MMIC-amplifier designed for the 9mm receiver. Therefore the noise figure at low frequencies is not ideal. The noise temperature vs frequency is shown in diagrams 1cm PFK RX Band 1 to 1cm PFK RX Band 3.

This system is part of the Primary Focus Multi Frequency Box #1 (PM 1).