| antenna |
dewar |
refrigerator |
3mm mixer |
1mm mixer |
1mm amp |
| bima1 carma7 |
dewar14 |
cylinder 5578 displacer 5747 |
31-016-3 IV curve Trcvr DSB bandpass.90GHz bandpass.112GHz |
31-015A-1 IV curve Trcvr DSB bandpass.220GHz bandpass.260GHz |
105D |
| bima2 carma8 |
dewar8 thermally stabilized photos |
cylinder 5747 displacer 6584 |
31-011-3 IV curve Trcvr DSB bandpass.90GHz bandpass.112GHz |
31-015-2K1 IV curve Trcvr DSB bandpass.220GHz bandpass.240GHz bandpass.260GHz |
107D amp 10B and wiring removed 09nov06 - something was shorted |
| bima3 carma9 |
dewar9 thermally stabilized photos |
cylinder 6154 (ebeam welded heat station) displacer 6418 |
31-011-5 (with separate bias tee) IV curve Trcvr DSB bandpass.90GHz bandpass.113GHz |
31-015A-7 IV curve Trcvr DSB bandpass.220GHz bandpass.240GHz bandpass.260GHz |
19D operate at Vgate=2.0 V, Idrain=13 mA (oscillates at higher drain currents) |
| bima4 carma10 |
dewar6 |
cylinder 5346 displacer 5346 |
31-011-7 IV curve Trcvr DSB bandpass.90GHz bandpass.110GHz |
31-015A-6 IV curve Trcvr DSB bandpass.220GHz bandpass.265GHz |
54D |
| bima5 carma11 (last lab test 13Sep06; installed on telescope sep06) |
dewar12 thermally stabilized photos |
cylinder 6585 displacer 6585 |
31-011-1 IV curve Trcvr DSB bandpass.90GHz bandpass.113GHz |
31-015-2W20; device from
wafer #1; bits of paper keep substrate from falling to bottom of slot IV curve Trcvr DSB bandpass.220GHz bandpass.240GHz bandpass.260GHz |
3L |
| bima6 carma 12 (final lab test, 30 Jan 2007) |
dewar13 thermally stabilized photos |
cylinder 7528 displacer 7528 operating at 56 / 13 / 3.5 / 3.7 / 3.6 K maintenance history |
31-016-1 with HEMT 15 IV curve Trcvr DSB with 1.3-2.2 GHz bandpass filter bandpass.80GHz bandpass.90GHz bandpass.113GHz |
31-015-4A with WBA13 #47D IV curve Trcvr DSB wideband bandpass.215GHz - 50, 60 uA bias bandpass.215GHz bandpass.225GHz bandpass.230GHz bandpass.240GHz bandpass.260GHz bandpass.268GHz |
47D operated at Vg = 2.1 V, Idrain = 20.2 mA |
| bima7 carma13 (lab tests, 03Nov06) (installed on antenna 08Nov06) |
dewar5 thermally stabilized |
cylinder 5746 displacer 5746 maintenance history |
31-016-4 IV curve Trcvr DSB bandpass.113GHz bandpass.100GHz bandpass.90GHz |
31-012-6 Trcvr DSB |
22B Vgate = 0.65 V, Idrain = 20 mA |
| bima8 carma 14 tested in lab 10jul06 |
dewar4 thermally stabilized photos cooldown |
31-016-2.10jul06 IV curve Trcvr DSB bandpass.90GHz bandpass.113GHz |
31-015-2.10jul06 IV curve Trcvr DSB bandpass.220GHz bandpass.260GHz |
89D |
|
| bima9 carma15 |
dewar11 thermally stabilized photos cooldown scope |
cylinder 6584 displacer 6154 02aug06 - new bearings, seals |
31-011-2 IV curve Trcvr DSB bandpass.90GHz bandpass.112GHz |
31-015A-5 IV curve Trcvr DSB bandpass.220GHz bandpass.255GHz |
55D |
| LAB - 29jun06 |
dewar4 |
31-016-4 IV curve Trcvr DSB |
31-015-2.29jun06 IV curve Trcvr DSB bandpass.220GHz bandpass.261GHz |
89D |
|
| LAB - 04jul06 |
dewar4 |
31-016-2.04jul06 IV curve Trcvr DSB |
31-015-2.04jul06 IV curve Trcvr DSB |
89D |
|
| LAB - 07jul06 |
dewar4 |
31-016-2.07jul06 IV curve Trcvr DSB |
31-015-2.07jul06 IV curve Trcvr DSB |
10B oscillates! |
|
| LAB - 19jul06 |
dewar9 |
31-011-5 (with separate bias tee) IV curve Trcvr DSB bandpass.90GHz bandpass.113GHz |
31-015A-7 |
19D on 3mm mixer oscillates |
|
| LAB - 21jul06 |
dewar9 |
31-016-4 IV curve Trcvr DSB bandpass.90GHz bandpass.113GHz |
31-015A-7 |
19D on 3mm mixer |
|
| WAS ON bima7 removed 7/14/06 |
dewar12 |
cylinder 6585 displacer 6585 |
31-011-1 IV curve Trcvr DSB bandpass.90GHz bandpass.113GHz |
371-12 |
|
| LAB - 24Aug06 |
dewar12 thermally stabilized dual pol photos |
cylinder 6585 displacer 6585 |
31-011-1 |
DUAL POL Custom Microwave OMT pol 1: 371-12 (IV curve) pol 2: 371-14 (IV curve) Trcvr DSB for both |
|
| LAB - 11Sep06 |
dewar12 thermally stabilized photos |
cylinder 6585 displacer 6585 |
31-011-1 |
31-015-2W20; device from
wafer #3; substrate may have fallen to bottom of slot in
mixer block IV curve Trcvr DSB bandpass.220GHz bandpass.260GHz |
3L |
| was on bima5 Mar-Sep 2006 |
dewar5 |
cylinder 5746 displacer 5746 |
31-011-9 IV curve Trcvr DSB bandpass.90GHz bandpass.110GHz |
31-012-6 IV curve Trcvr DSB bandpass.220GHz bandpass.240GHz bandpass.260GHz |
86D |
| LAB - 06Oct06 |
dewar5 thermally stabilized photos |
cylinder 5746 displacer 5746 maint, 02oct06: replaced defective valve plate, baked displacers; new bushings and stage3 seal |
31-011-9 mixer / 4-8 GHz Trak circulator / bias tee / WBA13 #86D IV curve Trcvr DSB bandpass.85GHz bandpass.90GHz bandpass.100GHz bandpass.110GHz |
31-012-6 IV curve no RF tests |
86D used for 3mm mixer; oscillated if Idrain > 9 mA |
| LAB - 01Nov06 |
dewar5 thermally stabilized photos |
cylinder 5746 displacer 5746 cooldown shows 2nd stage problem |
31-016-4 junction from 31-011-9 remounted into this block IV curve Trcvr DSB (at 4.5 K) |
31-012-6 junction recontacted, block reassembled IV curve bias tee changed S11 Trcvr DSB |
86D oscillates if Vgate > 2.15 V, Idrain > 7.7 mA photo shows possible gap under one side of the chip |
| was on bima7 (moved from C14 to C13 on 7/14/06) (removed from C13 08Nov06 because of flaky 3mm wiring) |
dewar13 |
cylinder 7528 displacer 7528 |
31-016-1 IV curve Trcvr DSB bandpass.90GHz bandpass.110GHz |
31-015-4A IV curve Trcvr DSB bandpass.220GHz bandpass.260GHz |
107D swapped in to dewar8 on C8, 09nov06 |
| LAB - 18Dec06 |
dewar13 thermally stabilized photos |
cylinder 7528 displacer 7528 maintenance history |
31-016-1 IV curve Trcvr DSB no bandpass measurements |
31-015-4A junction recontacted; replaced 150 ohm matching network with 50 ohm network IV curve no gain through IF amp; once biased, amp draws 20 mA drain current even with Vgate=0; IV curve comparison suggests amp is oscillating |
10B |
| LAB - 19 Dec 2006 |
dewar13 photos |
cylinder 7528 displacer 7528 |
31-016-1 followed by short SS coax, double amp built into block 31-20E-10, semiflex coax, HEMT #15 Trcvr DSB no bandpass measurements |
31-015-4A |
10B (not used) |
| LAB - 30 Dec 2006 |
dewar13 photos |
cylinder 7528 displacer 7528 operating at 57 / 13 / 3.2 / 3.5 / 3.3 K |
31-016-1 followed by short SS coax, double amp built into block 30-020D-03, SMA barrel, WBA13 #86D; double amp operated at Vgate=-7.47/30 V, Vdrain=+0.53 V, Idrain=9.6 mA; Trcvr DSB bandpass.90GHz bandpass2.90GHz, Vgate=0 bandpass.100GHz bandpass.113GHz |
31-015-4A (no bias cable to this mixer) |
86D (2nd amp for band B) operated at Vgate=2.2 V, Idrain=8 mA to avoid oscillation |
| LAB - 16 Jan 2007 |
dewar13 photos |
cylinder 7528 displacer 7528 operating at 56 / 13 / 3.2 / 3.5 / 3.3 K |
31-016-1 followed by short SS coax, LNA 4-8LN_J01 Trcvr DSB bandpass.86GHz bandpass.105GHz |
31-015-4A (no bias cable to this mixer) |
4-8LN_J01 operated at Vg1 = Vg2 = -0.16 V, Vd1 = 0.76 V, Vd2 = 0.91 V (outside dewar) followed by JCA amp, then PAM |
| LAB - 18 Jan 2007 |
dewar13 photos |
cylinder 7528 displacer 7528 operating at 56 / 13 / 3.2 / 3.5 / 3.3 K |
31-016-1 followed by SMA elbow, Trak 4-8 circulator, SMA barrel, LNA 4-8LN_J01 Trcvr DSB bandpass.86GHz bandpass.105GHz |
31-015-4A (no bias cable to this mixer) |
4-8LN_J01 operated at Vg1 = Vg2 = -0.16 V, Vd1 = 0.76 V, Vd2 = 0.91 V (outside dewar) followed by JCA amp, then PAM |
| LAB - 22 Jan 2007 |
dewar13 photos |
cylinder 7528 displacer 7528 |
31-016-1 with HEMT 15 IV curve Trcvr DSB bandpass.86GHz bandpass.105GHz bandpass.110GHz |
31-015-4A IV curve bandpass.220GHz bandpass.240GHz bandpass.260GHz INVALID TESTS - BROKEN CONN IN MIXER! |
4-8LN_J01 operated at Vg1 = Vg2 = -0.16 V, Vd1 = 0.70 V, Vd2 = 0.92 V (outside dewar) followed by JCA amp, then PAM (measured 220 GHz bandpass with Vg = -.14, Vd1 = 0.49, Vd2 = 1.05 - little change) |
| LAB - 28 Jan 2007 |
dewar13 photos |
cylinder 7528 displacer 7528 |
31-016-1 with HEMT 15 no tests |
31-015-4A IV curve Trcvr DSB with 3.8 GHz HP filter bandpass.220GHz bandpass.240GHz (comparison with WBA13) bandpass.264GHz |
4-8LN_J01 operated at Vg1 = Vg2 = -0.16 V, Vd1 = 0.72 V, Vd2 = 0.92 V (outside dewar) followed by JCA amp, then PAM |
| removed from bima6, 5 Feb 2007 |
dewar10 |
cylinder 6418 displacer 6584 |
31-011-4 IV curve Trcvr DSB bandpass.90GHz bandpass.110GHz |
31-015-1 IV curve Trcvr DSB bandpass.220GHz bandpass.260GHz |
104D |
| LAB TESTS, 20 Feb 2007 |
dewar10 thermally stabilized photos |
cylinder 6418 displacer 6584 operating at 74 /15 / 3.2 / 3.5 / 3.4 K maintenance history stage3 displacer photos |
31-011-4 (not tested) |
31-042-02 (NRAO junction) photos of test junction in block two 0.2" diam bonded disk magnets on simple galv steel pole pieces IV curve Trcvr DSB bandpass.220GHz bandpass.240GHz bandpass.260GHz |
104D |
| LAB TESTS, 23 Feb 2007 |
dewar10 thermally stabilized |
cylinder 6418 displacer 6584 |
31-011-4 IV curve (not tested) |
31-042-02 (NRAO junction) replaced Teflon IR filter with foam IR filter replaced 0.00024" thick beamsplitter with 0.0005" thick beamsplitter Trcvr DSB 246 GHz scans showing Josephson troubles |
104D |
| LAB TESTS, 21 Mar 2007 |
dewar10 thermally stabilized |
cylinder 6418 displacer 6584 |
31-011-4 (not tested) |
31-042-02 (NRAO junction) Zotefoam IR filter, 0.0005" thick beamsplitter, two 0.4" diam magnets IV curve Trcvr DSB 246 GHz scans for comparison with 23 Feb scans |
104D |
