The problem with a pulsar is it *pulses* in a regular manner.
So it would be distorting the signal, but only for brief periods followed by longer moments of relative clarity.
A conventiently placed blackhole would eat the signal, but then it would also start munching on the neighborhood.
And really, its a non-issue.
Say that the other guys have had radio tech for 200-300 years.
If their star is over that distance away in light-years, whatever early-signals they might have sent off will simply have not reached any possible reception on our end.
Even proxima centauri is over 5 light years away, just make it so that "jump points" are relatively sparse, or that they form more of a tangled skein than a web.
So it would be distorting the signal, but only for brief periods followed by longer moments of relative clarity.
A conventiently placed blackhole would eat the signal, but then it would also start munching on the neighborhood.
And really, its a non-issue.
Say that the other guys have had radio tech for 200-300 years.
If their star is over that distance away in light-years, whatever early-signals they might have sent off will simply have not reached any possible reception on our end.
Even proxima centauri is over 5 light years away, just make it so that "jump points" are relatively sparse, or that they form more of a tangled skein than a web.