GLI for PTT, MIC, and SPR using Autocom 1512
Redrew the schematic of the Ground Loop Isolation (GLI) circuit since it is much easier to understand than the version posted earlier in this thread.
The reed relay is a critical part of the interface box: it isolates the PTT line and is what enables you to use the Autocom PTT. The green isolation transformers are not in the box; I used a couple of other isolation transformers I had handy. I do use the RS isolation transformers in another interface between the Autocom and a Kenwood D700A ham radio.
The project box is a RS 270-1801 'Project Enclosure'. Parts were mounted on half of a RS 276-150 'Grid-Style PC Board'; it slides nicely into the slots of the box.
Note: Used a socket on box instead of second half of Part 1512; needed to mount box outside for space considerations - not enough room under seat.
Herman van Beek
2M/70cm/APRS - K5HVB(-10 when mobile)
FRS/GMRS - WQGD850
2005 F650CSA (Silver)
2005 R1200RT (Silver)
Last edited by scarver; Aug 16th, 2007 at 10:53 am.