When the icom is transmitting there is some background humming. When it is receiving, reports are 59 all across from other node users.
I had turned of all lighting and fans in the shack even though it was 107°F.
Since I took audio from the AF Output pin 8, it is directly related to the volume knob and squelch knob. I had to play a lot with RX level.
Just in case if someone else wants to build it as well, I'll share details below for the current setup.
Fob is prepared exactly like in the picture below from allstarsetup.com with the exception of transistor used. I used a 2n2222a instead of 2N3904.
RX line from the image is connected to pin 8.
TX line is connected to 2 x 100nf capacitors in series (#103) and then to pin 1 of the mic jack.
PTT is connected to pin 5.
COS is connected to pin 4. Inside the radio, a wire was soldered to the right side leg of the radio LED. This wire was routed through to the connection jack for pin 4 (It was the yellow wire in my radio which is IC-38, not IC-38A).
Ground is connected to pin 6 on the mic jack and to the empty connection point above transistor leg and to the right of PTT on CM108 fob in the picture.
ASL3 is set at half duplex. RX of node radio is extremely dependent on volume knob level therefore a mark on the radio for optimum levels will help get back to how it sounded in case it is fidgeted with.
Carrierfrom = usbinvert
CTCSSfrom = no
EDIT: Hum removed by wrapping fob and wire with metallic conductive tape.
