  The Deep Space Network (DSN) enables NASA to communicate with its spacecraft
in deep space. By virtue of its large antennas, the DSN can also be used as a
powerful instrument for radio astronomy. Specifically, Deep Space Station (DSS)
43, the 70 m antenna at the Canberra Deep Space Communications Complex (CDSCC)
has a K-band radio astronomy system covering a 10 GHz bandwidth at 17 GHz to 27
GHz. This spectral range covers a number of atomic and molecular lines,
produced in a rich variety of interstellar gas conditions. Lines include
hydrogen radio recombination lines (RRLs), cyclopropenylidene, water masers,
and ammonia. A new high-resolution spectrometer was deployed at CDSCC in
November 2019 and connected to the K-band downconverter. The spectrometer has a
total bandwidth of 16 GHz. Such a large total bandwidth enables, for example,
the simultaneous observations of a large number of RRLs, which can be combined
together to significantly improve the sensitivity of these observations. The
system has two firmware modes: 1) A 65k-pt FFT to provide 32768 spectral
channels at 30.5 kHz and 2) A 16k-pt polyphase filterbank (PFB) to provide 8192
spectral channels with 122 kHz resolution. The observation process is designed
to maximize autonomy, from the Principle Investigator's inputs to the output
data in FITS file format. We present preliminary mapping observations of
hydrogen RRLs in Orion KL mapping taken using the new spectrometer.
