How long can a trigger extension cable be and still function to trigger a seismograph?
In the past our engineers have tested trigger lines up to 1 Km without any noted latency issues. That was done with the standard RJ-58 Coax cable.
It is possible that it may work at distances longer, but we would recommend testing it above ground before field deployment.
We do have a Trigger Noise Filter, connected in-line with (long) trigger cables to suppress false triggering. Contact us for more information.