SEPIA345: A 345 GHz dual polarization heterodyne receiver channel for SEPIA at the APEX telescope

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Table 2

SEPIA345 total power and spectroscopic Allan times (τ_A, in seconds) estimated at different signal frequencies.

Frequency (GHz), sideband	Spectroscopic τ_A (s) in 1 MHz	Total power τ_A (s) in 125 MHz	Notes
291, LSB	>150	18 ± 6	Used for cont. observ.
295, LSB	>80	16 ± 7
321, USB	>60	20 ± 6	Near H₂O maser line
345, USB	>150	11 ± 4	CO J = 3 → 2
356, USB	>70	13 ± 4
371, USB	>90	11 ± 3

Notes. The total power τ_A value is the average over several 125-MHz-wide sub-bands within the 4 GHz FFTS IF segment. The variation is indicated as a standard error.

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