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Mike,
My Kendrick Newtonian heaters have finally arrived. Here is how I'm planning to keep the mirrors slightly above ambient so dew isn't a problem this year at astrofest.
The secondary heater has built in adjustable temperature control with ambient and mirror temperature sensors to keep the secondary 1-3 deg above ambient.
I'm planning to install a temperature sensor on the primary mirror so I can adjust the PWM dew controller to just raise the primary a bit above ambient.
Peter
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