Hi all,

Once you get to an RS-232 interface (USB adapter of some sort - watch out for the counterfeit ones!), the easiest way to get to the 736R is the simple TTL adapter from Manfred, XQ2FOD. Just takes 3 parts! See the file "RS232SIM.GIF" in http://ludens.cl/Electron/fodtrack/DRAWINGS.ZIP

I've used it for many years with a variety of tracking environments from FODTrack in DOS to GPredict in Linux.

Greg KO6TH

Mark Spencer via AMSAT-BB wrote:

Hi, I seem to recall running my FT 736 with sat32 pc running on a Windows 98 laptop (it has been some time since I have worked any satellites.)

I used a generic USB to RS232 converter unit and a home brew RS232 to yaesu computer control interface that came with my radio. Sorry I don't have a schematic for it.

There are some schematics floating around for the RS 232 to yaesu computer control interface.

This link seems helpful but I can't vouch for it's accuracy as I haven't tried building the circuit.

http://www.mindspring.com/~n2wwd/html/body_doppler_compensation.html

If I was building an interface today I'd probably skip the RS 232 step and try using a USB to 5 volt TTL serial converter (I'd want to double check the voltage levels on the radio interface first but the prior URL implies to me that the voltage levels are 5 volt TTL which seems reasonable to me given the age of the radio.)

Most of the USB to serial interfaces I've seen are 3.3 volt but I seem to recall seeing 5 volt ones advertised.

Hope this helps

Mark S VE7AFZ

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