Lxnav 9070 and MGL FF4 NMEA connection

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Joaquim Fonseca

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Jun 15, 2025, 7:16:34 PMJun 15

to LXNav Soaring Glider Equipment User Discussion Group

Hi,

I want them to send the GPS signal from the LX to MGL FF4 in order to calculate range. I don’t have a MGL RDAC. I have a LXNAV RS485 splitting unit, but I think I don’t need to use it.

If anyone has done something similar can you guide me, step by step, how to do it?

I think I need to use 1 cable connected to the PDA port in the LX and use cable on pin 5 (Output - data out RS232 - transmit line) . This cable I should connect to the purple cable (12) in FF4 (CAN Lo). And what about ground? Do I also need to connect? In this case it would be cable 1 (or 2] on the LX side to cable black (2) on the FF4.

Is this correct?

Thanks in advance,

Joaquim

Jim Staniforth

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Jun 15, 2025, 8:09:19 PMJun 15

to LXNav Soaring Glider Equipment User Discussion Group

What is the connector on the MGL?

When I sent GPS info to the Air-Com radio through a D-sub connector, I used a connector with screw terminals so I could easily connect and disconnect ground in case of a ground loop. It worked without connecting ground.