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Important news:

The ko4bb.com site will be moving to a new home. The traffic has slowly but surely increased over the years and our current home is simply not big enough.
I have been advised that this site could be shut down without notice, so I have temporarily suspended manual downloads until the new site is up (you will get a 404 Page not found when trying to download).
Do not be concerned, none of the manuals will be lost in the process (they have already been transferred to the new site). However, it would be appreciated if you could delay uploading new material until the transition is complete, in a week at the most.
For a quick look at how the site has evolved over the last 7 years, check the Statistics page.
Thank you for your patience.
Didier KO4BB, sysadmin.

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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May 11 2008 18:01:21