  We show that the standard Blandford-K\"onigl model for compact conical
relativistic jets has a peculiar feature: at a given observed frequency of
radiation, the emission from the approaching jet arrives at the location of a
distant observer at the same time as the emission from the counterjet for all
finite inclination angles. We show that this result can be used to determine
whether jets are genuinely symmetric, if the cross-coherence between radio and
X-ray time series can be measured at high Fourier frequency for a sample of
neutron star X-ray binaries with a range of inclination angles. We also discuss
echo mapping techniques that can be used to look for deviations from the
standard model in high cadence time series data on X-ray binary jets, and
conclude that these can plausibly be applied to some systems.
