  Observations with the Parkes radio telescope of the eclipsing millisecond
binary pulsar PSR J1748$-$2446A, which is in the globular cluster Terzan 5, are
presented. These include the first observations of this pulsar in the 3\,GHz
frequency band, along with simultaneous observations in the 700\,MHz band and
new observations around 1400\,MHz. We show that the pulsar signal is not
eclipsed in the 3\,GHz band and observe the known eclipses in the lower
frequency bands. We find that the observed pulse signal becomes depolarized
during particular orbital phases and postulate that this depolarization occurs
because of rotation-measure fluctuations resulting from turbulence in the
stellar wind responsible for the eclipses.
