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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

FreqDate TRX(A)TRX(B) TuneBackshort Mult 1Mult 2Mult 3Mult 4 E plane (A)E plane (B)Backshort (A)Backshort (B) LO diplex (A)LO diplex (B) IMag(A)IMag(B)
491.40820/12/00 314->384305->335 314216108101 44.3947.86352.13668.669 .9031.353 4440
49226/10/00 336->440386->412 3754 96210190103 6066
50626/10/00 1066->1303508->546 3235 7716617494 23.12533.040 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

FreqDate TRX(A)TRX(B) TuneBackshort Mult 1Mult 2Mult 3Mult 4 LO diplex (A)LO diplex (B) IMag(A)IMag(B)
Currently unable to tune below 626GHz (due to software bug).
64026/10/00 666->746702->792 2198 2357645122 8971305 2222
691.47326/10/00 656->9911124->1702 1141 105514361 2222
69520/10/00 733->9581145->1301 1140 104504960 10971282 324

Contact: Per Friberg. Updated: Mon Aug 16 13:13:45 HST 2004

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