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Tommy Nawratil, who works for the Austrian firm that received the first EQ8 in Europe, asked me to post the message below.
One user reports he gets the spike problem using Lodestar, but using the MGEN autoguider the problem does not occur. We sent him the guider simply to test another ST4 signal source. One other case with a different mount (not EQ8), has a similar problem using Lodestar, and again with MGEN it has vanished. There the ST4 reaction is triggered by Lodestar, but hangs and does not stop when the pulse is off.
So, I would suggest the bug may be connected somehow to the ST4 guide signals. We know for example, that Losmandy mounts using the standard handbox need extremely strong opto couplers, that are able to provide the needed pull down, otherwise the mount simply does not react. Also, they cannot react on pulses in RA and DEC coming simultaneously, they need a delay in between. So, ST4 is not exact enough a description.
Those having the bug should therefore not only provide diagrams, but also note the exact gear they use to obtain that diagrams. Maybe that could lead to a conclusion.
regards, Tommy
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