Zpectrometer commissioning report, Fall 2006
A. Harris, S. Zonak, K. Rauch, A. Baker, G. Watts, K. O'Neil, R. Creager,
    B. Garwood, P. Marganian

We report on the initial commissioning phases of the Zpectrometer, a
spectrometer to cover the entire Ka band at modest resolution. Our report
provides a summary of the first tests.  All important functional tests were
successful. Spectra show significant nonideal baseline structure, and we
identify two problems with the Ka band correlation receiver that are
potentially important. First, loss imbalance in the receiver's input
components pro duces an offset at the correlator output. Second, fluctuating
receiver gains multiply this offset to produce fluctuations at low lags in the
cross-correlation functions. These two effects combine to produce lumpy
spectral baselines. A third area of investigation is the generation of the
wideband tone needed to calibrate the correlator's internal phase.  Either the
test tone's sweep bandwidth or the receiver components will set limits on the
observing band.