NMEA data splitter (1 input to 4 outputs)

[Ken B]

Hi,

I have a GPS that sends NMEA-0183 data to my plotter. I want to send it to my radar, auto-pilot, and computer. I can't run more than 2 things from my GPS because adding more devices "load down" the data line. I need a way to "boost" and/or multiplex the line. NMEA data is basically just pulsating DC. As an example of what I need look at https://www.electro-tech-online.com/custompdfs/2004/05/lemm1.pdf
I can't afford what they want for it. I was wondering if there was an available schematic that I could make something similar to this?
Thanks

 

[Noggin]

Send it through 2 MAX232 devices rated for more current than the GPS unit can handle. MAX232's are old though, so you should be able to get a newer one that had more channels so you'd only need one. I don't know what they're called though.

In general you'd need the "new MAX232" device and a few caps. Thats about it.

Another option would be simply an OPAMP configured as a voltage follower.