  We present an experiment performed to understand the polarization convention
adopted for band 4 (550--900 MHz) of the upgraded Giant Metrewave Radio
Telescope (uGMRT). For that we observed the pulsar B1702--19 in this band, both
in interferometry and pulsar modes, and compare the results with its already
known Stokes $I$, $Q$, $U$, $V$ profiles obtained with the Lovell telescope. We
find that the results obtained from interferometry and pulsar modes of the
uGMRT agree with each other. However, although the Stokes $U$ profile obtained
with the uGMRT match with that obtained by the Lovell telescope, Stokes $Q$ and
$V$ do not. This can be explained if the $X$ and $Y$ dipoles in this band, from
which $R$ and $L$ are derived, are swapped w.r.t. the IAU convention. The
swapping makes $RR^*$ and $LL^*$ of the uGMRT band 4 to be $LL^*$ and $RR^*$
respectively according to the IEEE convention. This implies that if we need to
compare polarization measurements obtained in band 4 of the uGMRT with
telescopes like Lovell, Parkes, Very Large Array etc. (all follow IEEE
convention for defining right and left hand circular polarization), we must
interchange $RR^*$ and $LL^*$, and change the sign of Stokes $Q$ for the uGMRT
data. Note that this is the current convention for uGMRT band 4, and is likely
to change in future once the swapping of the dipoles is taken care of. Once it
is done, it will be notified in another technical report.
