Due to the non-digital, resistor-capacitor design of this old system, it requires adjustment to achieve a precise 60hz fequency. You turn the adjustment knob until the light stays on continuously (or is off continuously). You then supposedly have an accurrate 60 hz and precise sideral rate. It's worth checking periodically during the night to see if the frequency has changed due to a temperature change.

Thanks, Chuck! That explains my weird tracking error test result last night: http://gallery.utahastronomy.com/main.php?g2_itemId=11527 Have to try that one again and see if it improves things. That also may be a source for targeting error in the Skywizard.

until the light stays on continuously (or is off continuously).

No ambiguous signal there. -:) Which is it?

You'll have to ask Bruce or Patrick if SLAS still has the autoguider for the Ealing corrector.

Patrick, does SLAS have the autoguider? Thanks again, Kurt