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We've been having an issue with what I believe is a water hammer problem. However, it doesn't appear to be the typical hammer. In the past I've heard the hammer a short time before or after the cycle (Which I would like to correct)what's currently occurring is the hammer seems to strike with no real "connection" to or independent of the heating cycle. There most severe hammer seems to come from the riser to the second floor bathroom radiator. It does occur at one of the main floor radiators also but much less intense.
We have a one pipe steam system. The home was built in 1929, there is no insulation in the walls. ALL the exposed pipes are insulated and all the lines are properly pitched and all mains(3) are adequately vented.