Revisions: jee Initial jee Corrected label on Figs 6 and 7, Updated Block Diagram

Transcription

1 Memorandum To: From: File John Effland Date: Revisions: jee Initial jee Corrected label on Figs 6 and 7, Updated Block Diagram Subject: Comparison of Band 6 Cartridge Measurements in and Cartridge Test s Noise temperature, image rejection, and gain of the Band 6 Cartridge SN1 are compared when it s installed in the and in the Cartridge Test (). The data are taken from Koller s graphs 1 measured by Dan, Ralph Groves, and Dave Schmitt. There appears to be an error with those graphs because the 6-1 GHz data, annotated as Polarization 1, is most likely Polarization because those points are nearly identical to the 4-12 GHz Polarization data. The equipment configuration for the Cartridge Test is shown in Figure 1 and is similar to the configuration used for the measurements. Cartridge noise temperatures (Figure 2 and Figure 3) are about % lower (~8K at the lowest noise temperature) when measured in the, probably because the mixers operate at lower physical temperatures in the RAL Dewar. Mixer temperatures are controlled to ~4.2K in the but are ~3.5K in the. A troubling discrepancy exists in the image rejection for the LSB, shown in Figure 4, where it degrades to about 6 db in the compared to 9.8 db when measured in the. Image rejection for USB, shown in Figure 5, is nearly the same when measured in both systems. A problem is clearly evident in the cartridge gain data, which includes the warm IF amplifiers, graphed in Figure 6 and Figure 7. LSB gain in the measured at the three lowest intermediate frequencies and at the three highest USB IFs fall more than 1 db below cartridge gains measured in the. 1 File: \\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\mxrvscart\report1.doc Page 1 of 5 Last Saved: :13:

2 Optics Cold Load Chopper Wheel Hot Load Cartridge Window 11K IR Filter 15K IR Filter 9 Mirrors Pol OMT 9 1 HYBRID 2 X3 X3 1 WCA LO Assy WHU (~45 cm) WHU (~91 cm) Warm IF Amps Pacific Millimeter WM Harmonic Mixer Warm Multiplier Assy WR-1 Lock Box PLL 9 9 X3 X2 Active Multiplier Chain YIG Tuned Osc 3 db Warm IF Plate MITEQ AFD P Dow-Key RLC F-1- G = 36 db HP -11 db 4-5-R NF = 5.3 db ATTNS 3 db 6 db G = 26 db NF = 5.3 db 4 GHz HPF Noise Source WHU (~45 cm) Agilent 346B dbm HP 83732B Synthesizer MITEQ AFD P BW ~ 5 MHz 1 db NC Sideband source Beam Scanner NAOJ Test Cryostat Vacuum Pol 1 9 Sensor diodes heaters 2 Vacuum Warm IF Amps Bias Supply Atmosphere Dewar Heater Power Supply Lakeshore Temp. Controller Lakeshore Temperature Meter M&C I2C Bus Module Cartridge Connector Plate FE WCA Harness Plate Computer GPIB Controller dbm Pol 1 connected manually LO and Bias M&C Module Noise Source P.S. Attenuator Driver Spectrum Analyzer Oscilloscopes Digital I/O (HP) Fluke 66A Synthesizer IF Switch Contoller YIG Contoller Vacuum monitor Sideband Lockbox EIP Counter CAN bus controller NI 625E I/O card Agilent 4418B Power Meter LO/Bias Pwr Sup's Agilent E93A Power Sensor Pwr Sup (Attn Driver) RS-232 UPS Chopper Controller BNC Breakout Box NI 625E I/O card Enlarged lettering in OSC, added gain of amps, K to 15K Updated with more annotation Genesis is Koller's BlkDiagV9 Allan Variance Equipment HP Attns -11 db -11 db HP8473B INA11 HP 3567A Dynamic Signal Analyzer Test Configuration: Cartridge Test K&L 4B38-475/5- (5 MHz BW) 18 V \\Cvfiler\cv-cdl-sis\Cartridge\AcceptTsts\BlkDiagV12jee.dwg SEE ABOVE Figure 1: Measurement Equipment for Cartridge Test Page 2 of 5 Saved: :13:

3 14 Mixer Block 29 UVA-N1-5-L EB-C12-L56-2 & Amp #26 (Mixer UVA N1 5 L EB C12 L56 5 & A #33 (Mi Noise Temperature Cartridge 1 vs Cartridge Test Polarization, LSB Measured in ::11 Measured in :57:19 Noise Temperature (K) (Corrected for Image Rejection) Data File: "\\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\ralvs\summary.xls" Sheet: "NTPolLSB" Figure 2: Noise Temps, Pol LSB 14 Mixer Block 29 UVA-N1-5-L EB-C12-L56-2 & Amp #26 (Mixer UVA N1 5 L EB C12 L56 5 & A #33 (Mi Noise Temperature Cartridge 1 vs Cartridge Test Polarization, USB Measured in ::11 Measured in :57:19 1 Noise Temperature (K) (Corrected for Image Rejection) Data File: "\\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\ralvs\summary.xls" Sheet: "NTPolUSB" Figure 3: Noise Temps, Pol USB Page 3 of 5 Saved: :13:

4 1 Mixer Block 29 UVA-N1-5-L EB-C12-L56-2 & Amp #26 (Mixer UVA N1 5 L EB C12 L56 5 & A #33 (Mi Image Rejection vs Cartridge Test Polarization, LSB Measured in ::11 Measured in :57: Image Rejection (db) Spec Data File: "\\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\ralvs\summary.xls" Sheet: "IRPolLSB" Figure 4: Image Rejection, Pol LSB 1 Mixer Block 29 UVA-N1-5-L EB-C12-L56-2 & Amp #26 (Mixer UVA N1 5 L EB C12 L56 5 & A #33 (Mi Image Rejection vs Cartridge Test Polarization, USB Measured in ::11 Measured in :57: Image Rejection (db) Spec Data File: "\\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\ralvs\summary.xls" Sheet: "IRPolUSB" Figure 5: Image Rejection, Pol USB Page 4 of 5 Saved: :13:

5 Gain of Cartridge 1 vs Cartridge Test Polarization, LSB 1 9 Mixer Block 29 UVA-N1-5-L EB-C12-L56-2 & Amp #26 (Mixer UVA-N1-5-L EB-C12-L56-5 & Amp #33 (Mixer 2) Measured in ::11 Measured in :57: Gain (db) Data File: "\\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\ralvs\summary.xls" Sheet: "GainPolLSB" Figure 6: Cartridge Gain (Including Warm IF Amps), Pol LSB Gain of Cartridge 1 vs Cartridge Test Polarization, USB 1 9 Mixer Block 29 UVA-N1-5-L EB-C12-L56-2 & Amp #26 (Mixer UVA-N1-5-L EB-C12-L56-5 & Amp #33 (Mixer 2) Measured in ::11 Measured in :57: Gain (db) Data File: "\\cvfiler.cv.nrao.edu\cv-cdl-sis\cartridge\sysengr\ralvs\summary.xls" Sheet: "GainPolUSB" Figure 7: Cartridge Gain (Including Warm IF Amps), Pol USB Page 5 of 5 Saved: :13: