RxW tuning test results
The following tables show the results from tuning tests on RxW. We attempt to perform these once per week,
although other problems often cause the updates to be less frequent than we would like.
The receiever temperature values are the ranges given by a three load calibration using the DAS as the backend
(ie. the temperatures derived in the different subbands), an average of these should be considered the actual
receiver temperature.
Blanks in the table are where a value was not recorded (for whatever reason).
D-band has two tunerless mixers, thus the E-plane and backshort values are not required.
Due to backlash in the micrometers these values are all approached from below, thus when trying to reproduce
these tunings the micrometers should also be turned to a value lower than that given, then moved up to the
correct value. (Note that this wasn't followed on the 20/10 and 26/10 tests).
C-Band
| Freq | Date |
TRX(A) | TRX(B) |
Tune | Backshort |
Mult 1 | Mult 2 | Mult 3 | Mult 4 |
E plane (A) | E plane (B) | Backshort (A) | Backshort (B) |
LO diplex (A) | LO diplex (B) |
IMag(A) | IMag(B) |
| 491.408 | 20/12/00 |
314->384 | 305->335 |
| |
314 | 216 | 108 | 101 |
44.39 | 47.863 | 52.136 | 68.669 |
.903 | 1.353 |
44 | 40 |
| 492 | 26/10/00 |
336->440 | 386->412 |
37 | 54 |
96 | 210 | 190 | 103 |
| | | |
| |
60 | 66 |
| 506 | 26/10/00 |
1066->1303 | 508->546 |
32 | 35 |
77 | 166 | 174 | 94 |
23.125 | | 33.040 | |
1.109 | |
| |
| Right on the limit of the Gunn tuning range. Mixer A showed very poor
performance. Mixer A performance was similarly bad (1082->1377 K) in single mixer mode with the polariser
turret adjusted to provide the maximum LO signal. |
D-Band
| Freq | Date |
TRX(A) | TRX(B) |
Tune | Backshort |
Mult 1 | Mult 2 | Mult 3 | Mult 4 |
LO diplex (A) | LO diplex (B) |
IMag(A) | IMag(B) |
| Currently unable to tune below 626GHz (due to software bug). |
| 640 | 26/10/00 |
666->746 | 702->792 |
21 | 98 |
235 | 76 | 45 | 122 |
897 | 1305 |
22 | 22 |
| 691.473 | 26/10/00 |
656->991 | 1124->1702 |
11 | 41 |
105 | 51 | 43 | 61 |
| |
22 | 22 |
| 695 | 20/10/00 |
733->958 | 1145->1301 |
11 | 40 |
104 | 50 | 49 | 60 |
1097 | 1282 |
32 | 4 |
|