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Thought I'd drop a line to let you know I managed to get the TDM encoder signals converted to TTL without messing up the TDM. It seems to work very well and gives me 20,000tic/rev for my Argo Navis as well as providing what the TDM needs. The encoder plugs into the converter and a new cable connects the converter to the TDM.
I put an ERN120 on the DEC axis to give me 20,000tic/rev on that axis and this plugs into the enclosure for the TDM encoder converter circuitry. A 9pin to RJ45 cable supplies the Argo Navis with the RA and DEC TTL quadrature signals. Both encoders are powered independently of the TDM and Argo Navis so I have the option of just using the Argo Navis when not imaging.
Now I need to wait for clear winter skies and then I can test out how good a quick 4 star polar alignment can be with these encoders and further test/use the TDM.
Cheers
David
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