[evlatests] Antenna 16 Q-band total power
Bryan Butler
bbutler at nrao.edu
Thu Dec 8 18:25:05 EST 2005
On 12/8/05 16:17, Walter Brisken wrote:
> At peak, the total power detector
> reported -28.63dB. Comparing to the off-source value of -29.69dB
> suggests that Venus added 27% to Tsys. This offset explains Ken's
> non-fringes. Is anyone prepared to say if this is reasonable?
i can comment on the Tsys value. expected increase in Tsys from venus at 43 GHz
is ~40 K (assuming 35% efficiency). if this added 27% to Tsys, then without
venus Tsys was ~150 K, which is pretty high for Q-band. so either Tsys looks
high, or the efficiency is much lower than 35%.
-bryan
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