  We present a new set of measurements obtained with the Combined Array for
Research in Millimeter-wave Astronomy (CARMA) of Jupiter's microwave thermal
emission near the 1.3 cm ammonia (NH$_{3}$) absorption band. We use these
observations to investigate the ammonia mole fraction in the upper troposphere,
near $0.3 < P < 2$ bar, based on radiative transfer modeling. We find that the
ammonia mole fraction must be $\sim2.4\times 10^{-4}$ below the NH$_{3}$ ice
cloud, i.e., at $0.8 < P < 8$ bar, in agreement with results by de Pater et al.
(2001, 2016a). We find the NH$_{3}$ cloud-forming region between $0.3 < P <
0.8$ bar to be globally sub-saturated by 55% on average, in accordance with the
result in Gibson et al. (2005). Although our data are not very sensitive to the
region above the cloud layer, we are able to set an upper limit of $2.4\times
10^{-7}$ on the mole fraction here, a factor of $\sim$10 above the saturated
vapor curve.
