  We present radio coverage of the 2019 outburst of the accreting millisecond
X-ray pulsar SAX J1808.4-3658, obtained with MeerKAT. We compare these data to
contemporaneous X-ray and optical measurements in order to investigate the
coupling between accretion and jet formation in this system, while the optical
lightcurve provides greater detail of the outburst. The reflaring activity
following the main outburst peak was associated with a radio re-brightening,
indicating a strengthening of the jet in this phase of the outburst. We place
quasi-simultaneous radio and X-ray measurements on the global radio:X-ray plane
for X-ray binaries, and show they reside in the same region of luminosity space
as previous outburst measurements, but significantly refine the correlation for
this source. We also present upper limits on the radio emission from the
accreting millisecond X-ray pulsar MAXI J0911-655 and the transitional
Z/Atoll-type transient XTE J1701-462. In the latter source we also confirm that
nearby large-scale structures reported in previous radio observations of the
source are persistent over a period of ~15 years, and so are almost certainly
background radio galaxies and not associated with the X-ray transient.
