1. System Specifications Lab Tests
KFPA CDR
Jan 30-31, 2009
System Specs KFPA CDR Jan

2. General Requirements Lab Results
Frequency Range: GHz; goal GHz with degraded performance.
Instantaneous Bandwidth: 1.8 GHz minimum.
Noise Temperature: 36 K maximum GHz; 25K maximum over 75%
Polarization Axial Ratio: 1 dB maximum
Polarization Isolation: 25 dB minimum (within a pixel).
Pixel-Pixel Isolation: 30 dB minimum
Output Flatness: 3dB p-p maximum
Linearity: 30 dB below 1dB point at 300K
System Specs KFPA CDR Jan

3. System Specs KFPA CDR Jan 30-31 2009
Frequency Range
System gain falls off rapidly outside GHz and noise temp increases, but might be usable just outside for some applications.
System Specs KFPA CDR Jan

4. System Specs KFPA CDR Jan 30-31 2009
Frequency Range
Of the cooled components, the OMT limits the upper frequency.
System Specs KFPA CDR Jan

5. System Specs KFPA CDR Jan 30-31 2009
Noise Temperature
Receiver noise is less than the current K-band rx, and Tcal varies more smoothly.
System Specs KFPA CDR Jan

6. Axial Ratio Measurements
Measured axial ratio is well less than the 1dB spec.
Freq (GHz)
LCP (dB)
RCP (dB) 19
0.44
0.20 22
0.42
0.62 24
0.38
0.29 25
0.34
0.28 26
0.70
0.54
System Specs KFPA CDR Jan

7. System Specs KFPA CDR Jan 30-31 2009
Isolation
Polarization Isolation
Prototype IDM1 has low isolation at some frequencies that will be corrected.
OMT polarization isolation >35 dB
Pixel-Pixel Isolation not yet measured.
Have checked thermal gaps and are OK.
System Specs KFPA CDR Jan

8. System Specs KFPA CDR Jan 30-31 2009
Gain Flatness
Measured thru dewar and IDM-2.
Ripple originates inside the dewar, mismatch error between LNA output and waveguide window thru ~40cm interconnecting wg.
System Specs KFPA CDR Jan

9. System Specs KFPA CDR Jan 30-31 2009
Linearity
IDM variable attenuators before final IF amps allow adjustments. With min atten, Tsys=100K, we’re ~25dB below P1db.
System Specs KFPA CDR Jan