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FT-817 CAT Interface


Here is the schematic of the simple CAT interface I use with my FT-817.

It is very simple and takes power from the FT-817 itself, so you want to make sure it is unplugged when you run off batteries.

It does not meet the EIA-232 standard for the output voltage, but I have not found a computer made in the last 10 years that did not work well with it.

With this interface, the output voltage is 0 or about +13V, where EIA-232 requires that the voltage be either more negative than -3VDC, or more positive than +3VDC.

I hope you are as lucky as I am.

This interface works well in conjuction with my Dual Radio Interface described elsewhere.


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October 02 2014 09:31:01